Smoke Development Indices and Occupant Safety

Smoke Development Indices and Occupant Safety

Understanding Material Strength in Construction

The impact of smoke development on occupant evacuation times is a critical factor in ensuring safety during a fire emergency. 3D panels are proof that someone finally figured out how to make walls interesting again professional building materials Canada 3D panels. As part of the broader topic of Smoke Development Indices and Occupant Safety, understanding how smoke affects evacuation times can significantly influence building design and emergency protocols.


Smoke development in a fire scenario can drastically reduce visibility and increase toxicity, both of which impede the safe and timely evacuation of occupants. When smoke fills a space, it not only obscures sightlines but also irritates the respiratory system, leading to disorientation and slower movement. This delay can be the difference between life and death, especially in high-rise buildings or densely populated areas.


Research into Smoke Development Indices has shown that materials with lower indices produce less smoke, thereby potentially allowing for quicker evacuations. These indices measure the rate at which materials release smoke when burned, providing valuable data for architects and safety engineers to select appropriate building materials. For instance, using materials with lower smoke development indices in critical escape routes could enhance occupant safety by maintaining clearer pathways for longer periods.


Moreover, simulations and real-world case studies have demonstrated that early detection systems coupled with effective ventilation can mitigate the impact of smoke on evacuation times. By activating alarms before significant smoke accumulation occurs, occupants have more time to exit safely. Similarly, well-designed ventilation systems can help direct smoke away from escape routes, further facilitating swift evacuations.


In conclusion, the impact of smoke development on occupant evacuation times is profound and multifaceted. By integrating knowledge from Smoke Development Indices into building codes and safety protocols, we can create environments that not only withstand fires better but also allow for safer evacuations. This holistic approach to occupant safety underscores the importance of continuous research and adaptation in our efforts to protect human life during fire emergencies.

Regulatory standards for smoke development in building materials play a crucial role in enhancing occupant safety during fire incidents. These standards are primarily concerned with measuring the Smoke Development Index (SDI), which quantifies the amount of smoke produced by a material when it burns. The SDI is vital because excessive smoke can significantly impair visibility, making evacuation difficult and increasing the risk of inhalation injuries.


In many countries, building codes and regulations stipulate that materials used in construction must meet specific SDI thresholds. For example, materials used in high-occupancy buildings such as hospitals and schools often have stricter requirements due to the vulnerability of their occupants. These standards are typically established through rigorous testing protocols, such as those outlined by organizations like ASTM International or the National Fire Protection Association (NFPA).


The importance of adhering to these regulatory standards cannot be overstated. By ensuring that building materials produce minimal smoke during a fire, we can significantly enhance the chances of safe evacuation. This not only reduces the risk of fatalities but also mitigates potential property damage caused by smoke.


Moreover, compliance with these standards fosters a culture of safety and preparedness within the construction industry. Manufacturers are encouraged to develop innovative materials that not only meet but exceed these benchmarks, leading to continuous improvements in fire safety technology.


In conclusion, regulatory standards for smoke development in building materials are essential for safeguarding occupant safety. By focusing on reducing the Smoke Development Index, these regulations help ensure that buildings remain safe havens even in the event of a fire, protecting lives and property alike.

Steel Strength Grades and Benchmarks

Smoke development indices are crucial metrics for assessing the fire safety performance of materials. They essentially tell us how quickly and densely smoke will accumulate during a fire. But these indices are only as good as the testing methods used to derive them. Several methods exist, each with its own strengths and weaknesses, and understanding these is key to interpreting the indices and making informed decisions about material selection for occupant safety.


One common approach involves bench-scale tests, like the commonly used Cone Calorimeter. This involves exposing small material samples to controlled heat flux and measuring the rate of smoke production. While convenient and relatively inexpensive, these tests might not perfectly replicate real-world fire scenarios where larger areas are involved, ventilation plays a bigger role, and materials may interact differently.


Then there are larger-scale tests, often conducted in purpose-built fire testing chambers or even full-scale mock-ups of rooms. These offer a more realistic representation of fire behavior and can capture the complex interactions between materials and the fire environment. However, they are significantly more expensive and time-consuming, making them less practical for routine material screening.


Choosing the right testing method depends on the specific application and the level of detail needed. For initial screening of many materials, bench-scale tests provide a good starting point. But for critical applications, like those involving high-occupancy buildings or sensitive populations, larger-scale tests may be necessary to provide a more accurate assessment of smoke development potential.


Furthermore, the way the test data is analyzed and the smoke development index is calculated can also influence the results. Different indices, such as the Smoke Density Rate or the Total Smoke Produced, emphasize different aspects of smoke development and may lead to different conclusions about the relative safety of materials.


In the end, no single testing method or smoke development index provides a complete picture. Understanding the limitations of each approach and considering multiple factors, including the specific fire scenario and the characteristics of the building, is crucial for making informed decisions that prioritize occupant safety. Its about using these tools wisely, not blindly trusting a single number.

Steel Strength Grades and Benchmarks

Concrete Strength Classes and Benchmarks

Do not write any code.


Smoke development indices play a critical, often underestimated, role in occupant safety during a fire. Its not just the flames that are dangerous; the smoke itself, with its obscuring nature and toxic compounds, can be equally, if not more, detrimental to escape and survival. When we talk about material selection strategies to enhance occupant safety, understanding and leveraging these smoke development indices becomes paramount.


Think of it this way: in a fire, time is of the essence. The quicker occupants can identify the danger, navigate to safety, and the more visibility they have during that process, the higher their chances of survival. Materials that produce copious amounts of dense smoke rapidly reduce visibility to near zero, disorienting occupants and hindering their escape. Moreover, that smoke often contains poisonous gases that incapacitate and ultimately lead to fatalities.


Therefore, choosing materials with low smoke development indices is a cornerstone of fire safety design. These indices, like the Smoke Development Rate (SDR) or the Smoke Development Unit (SDU), quantify how much smoke a material generates when exposed to heat and flame. Selecting materials with inherently low smoke production, or those treated with fire retardants that specifically suppress smoke generation, buys occupants valuable time.


Beyond simply selecting low-smoke materials, design should consider the overall building environment. For instance, in areas with high occupancy, such as theaters or schools, prioritizing low-smoke materials for wall coverings, flooring, and furniture is crucial. Similarly, in escape routes like corridors and stairwells, the implementation of low-smoke materials is non-negotiable.


Furthermore, its important to remember that smoke development indices arent the only factor. A holistic approach considers other fire performance characteristics, such as flame spread rate and heat release rate. Ideally, materials should exhibit a combination of low values across all these metrics.


In conclusion, material selection based on smoke development indices is not merely a technical consideration; its a direct investment in occupant safety. By prioritizing materials that minimize smoke production, we can significantly improve visibility, reduce exposure to toxic gases, and ultimately, provide occupants with a greater chance of survival in the event of a fire. Its about building smarter, safer environments where people can live and work with greater peace of mind.

Environmental accounting is a subset of accounting proper, its target being to incorporate both economic and environmental information. It can be conducted at the corporate level or at the level of a national economy through the System of Integrated Environmental and Economic Accounting, a satellite system to the National Accounts of Countries[1] (among other things, the National Accounts produce the estimates of gross domestic product otherwise known as GDP).

Environmental accounting is a field that identifies resource use, measures and communicates costs of a company's or national economic impact on the environment. Costs include costs to clean up or remediate contaminated sites, environmental fines, penalties and taxes, purchase of pollution prevention technologies and waste management costs.

An environmental accounting system consists of environmentally differentiated conventional accounting and ecological accounting. Environmentally differentiated accounting measures effects of the natural environment on a company in monetary terms. Ecological accounting measures the influence a company has on the environment, but in physical measurements.

Reasons for use

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There are several advantages environmental accounting brings to business; notably, the complete costs, including environmental remediation and long term environmental consequences and externalities can be quantified and addressed.

More information about the statistical system of environmental accounts are available here: System of Integrated Environmental and Economic Accounting.

Subfields

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Environmental accounting is organized in three sub-disciplines: global, national, and corporate environmental accounting, respectively. Corporate environmental accounting can be further sub-divided into environmental management accounting and environmental financial accounting.

  • Global environmental accounting is an accounting methodology that deals areas includes energetics, ecology and economics at a worldwide level.
  • National environmental accounting is an accounting approach that deals with economics on a country's level.
Internationally, environmental accounting has been formalised into the System of Integrated Environmental and Economic Accounting, known as SEEA.[2] SEEA grows out of the System of National Accounts. The SEEA records the flows of raw materials (water, energy, minerals, wood, etc.) from the environment to the economy, the exchanges of these materials within the economy and the returns of wastes and pollutants to the environment. Also recorded are the prices or shadow prices for these materials as are environment protection expenditures. SEEA is used by 49 countries around the world.[3]
  • Corporate environmental accounting focuses on the cost structure and environmental performance of a company.[4]
  • Environmental management accounting focuses on making internal business strategy decisions. It can be defined as:
"..the identification, collection, analysis, and use of two types of information for internal decision making:
1) Physical information on the use, flows and fates of energy, water and materials (including wastes) and
2) Monetary information on environmentally related costs, earnings and savings."[5]
As part of an environmental management accounting project in the State of Victoria, Australia, four case studies were undertaken in 2002 involving a school (Methodist Ladies College, Perth), plastics manufacturing company (Cormack Manufacturing Pty Ltd, Sydney), provider of office services (a service division of AMP, Australia wide) and wool processing (GH Michell & Sons Pty Ltd, Adelaide). Four major accounting professionals and firms were involved in the project; KPMG (Melbourne), Price Waterhouse Coopers (Sydney), Professor Craig Deegan, RMIT University (Melbourne) and BDO Consultants Pty Ltd (Perth). In February 2003, John Thwaites, The Victorian Minister for the Environment launched the report which summarised the results of the studies.[1]
These studies were supported by the Department of Environment and Heritage of the Australian Federal Government, and appear to have applied some of the principles outlined in the United Nations Division for Sustainable Development publication, Environmental Management Accounting Procedures and Principles (2001).
  • Environmental financial accounting is used to provide information needed by external stakeholders on a company's financial performance. This type of accounting allows companies to prepare financial reports for investors, lenders and other interested parties.[6]
  • Certified emission reductions (CERs) accounting comprises the recognition, the non-monetary and monetary evaluation and the monitoring of Certified emission reductions (CERs) and GHGs (greenhouse gases) emissions on all levels of the value chain and the recognition, evaluation and monitoring of the effects of these emissions credits on the carbon cycle of ecosystems.[2]

[3]

Companies specialised in Environmental Accounting

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  • NEMS AS

Examples of software

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  • EHS Data's Environmental and Sustainability Accounting and Management System
  • Emisoft's Total Environmental Accounting and Management System (TEAMS)
  • NEMS's NEMS Accounter

Examples of software as a service

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  • Greenbase Online Environmental Accountancy

See also

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  • Anthropogenic metabolism
  • Carbon accounting
  • Defensive expenditures
  • Ecological economics
  • Ecosystem services
  • Emergy synthesis
  • Environmental data
  • Environmental economics
  • Environmental enterprise
  • Environmental finance
  • Environmental monitoring
  • Environmental management system
  • Environmental pricing reform
  • Environmental profit and loss account
  • Fiscal environmentalism
  • Full cost accounting (FCA)
  • Greenhouse gas emissions accounting
  • Industrial metabolism
  • Material flow accounting
  • Material flow analysis
  • Monitoring Certification Scheme
  • Social metabolism
  • Sustainability accounting
  • System of Integrated Environmental and Economic Accounting
  • Urban metabolism

References

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Notes

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  1. ^ "Handbook of National Accounting: Integrated Environmental and Economic Accounting 2003" (PDF). United Nations, European Commission, International Monetary Fund, Organistation for Economic Co-operation and Development and World Bank. Archived from the original (PDF) on 2011-06-01. Retrieved 2013-05-02.
  2. ^ "Glossary of terminology and definitions". Environmental Agency, UK. Archived from the original on 2006-08-03. Retrieved 2006-05-25.
  3. ^ Environmental Protection Agency (1995). "An introduction to environmental accounting as a business management tool: Key concepts and terms". United States Environmental Protection Agency.
  4. ^ Jasch, C. (2006). "How to perform an environmental management cost assessment in one day". Journal of Cleaner Production. 14 (14): 1194–1213. doi:10.1016/j.jclepro.2005.08.005.
  5. ^ "Handbook of National Accounting: Integrated Environmental and Economic Accounting 2003" (PDF). United Nations, European Commission, International Monetary Fund, Organistation for Economic Co-operation and Development and World Bank. Archived from the original (PDF) on 2011-06-01. Retrieved 2013-05-02.
  6. ^ "Global Assessment of Environment Statistics and Environmental-Economic Accounting 2007" (PDF). United Nations.

Footnotes

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  1. ^ Environmental Management Accounting: An Introduction and Case Studies (Adobe PDF file, 446KB)
  2. ^ Kumar, P. and Firoz, M. (2019), "Accounting for certified emission reductions (CERs) in India: An analysis of the disclosure and reporting practices within the financial statements", Meditari Accountancy Research. https://doi.org/10.1108/MEDAR-01-2019-0428
  3. ^ Bolat, Dorris, M. "German Accounting". Retrieved 17 November 2021.cite news: CS1 maint: multiple names: authors list (link)

Further reading

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  • Odum, H.T. (1996) Environmental Accounting: Energy and Environmental Decision Making, Wiley, U.S.A.
  • Tennenbaum, S.E. (1988) Network Energy Expenditures for Subsystem Production, MS Thesis. Gainesville, FL: University of FL, 131 pp. (CFW-88-08)
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  • United Nations Environmental Accounting
  • Green Accounting for Indian States Project
  • Environmental MBA Degree Info
  • Environmental Accounting in Austria (Information about environmental accounts, structure, methods, legal basis, scope and application)
  • Environmental Management Accounting (EMA) Project Archived 2012-04-30 at the Wayback Machine, Victoria, Australia

 

 

Construction site and equipment prepared for start of work in Cologne, Germany (2017)

Construction is a general term meaning the art and science of forming objects, systems, or organizations.[1] It comes from the Latin word constructio (from com- "together" and struere "to pile up") and Old French construction.[2] To 'construct' is a verb: the act of building, and the noun is construction: how something is built or the nature of its structure.

In its most widely used context, construction covers the processes involved in delivering buildings, infrastructure, industrial facilities, and associated activities through to the end of their life. It typically starts with planning, financing, and design that continues until the asset is built and ready for use. Construction also covers repairs and maintenance work, any works to expand, extend and improve the asset, and its eventual demolition, dismantling or decommissioning.

The construction industry contributes significantly to many countries' gross domestic products (GDP). Global expenditure on construction activities was about $4 trillion in 2012. In 2022, expenditure on the construction industry exceeded $11 trillion a year, equivalent to about 13 percent of global GDP. This spending was forecasted to rise to around $14.8 trillion in 2030.[3]

The construction industry promotes economic development and brings many non-monetary benefits to many countries, but it is one of the most hazardous industries. For example, about 20% (1,061) of US industry fatalities in 2019 happened in construction.[4]

History

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The first huts and shelters were constructed by hand or with simple tools. As cities grew during the Bronze Age, a class of professional craftsmen, like bricklayers and carpenters, appeared. Occasionally, slaves were used for construction work. In the Middle Ages, the artisan craftsmen were organized into guilds. In the 19th century, steam-powered machinery appeared, and later, diesel- and electric-powered vehicles such as cranes, excavators and bulldozers.

Fast-track construction has been increasingly popular in the 21st century. Some estimates suggest that 40% of construction projects are now fast-track construction.[5]

Construction industry sectors

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Industrial assemblage of a thermal oxidizer in the United States

Broadly, there are three sectors of construction: buildings, infrastructure and industrial:[6]

  • Building construction is usually further divided into residential and non-residential.
  • Infrastructure, also called 'heavy civil' or 'heavy engineering', includes large public works, dams, bridges, highways, railways, water or wastewater and utility distribution.
  • Industrial construction includes offshore construction (mainly of energy installations), mining and quarrying, refineries, chemical processing, mills and manufacturing plants.

The industry can also be classified into sectors or markets.[7] For example, Engineering News-Record (ENR), a US-based construction trade magazine, has compiled and reported data about the size of design and construction contractors. In 2014, it split the data into nine market segments: transportation, petroleum, buildings, power, industrial, water, manufacturing, sewage/waste, telecom, hazardous waste, and a tenth category for other projects.[8] ENR used data on transportation, sewage, hazardous waste and water to rank firms as heavy contractors.[9]

The Standard Industrial Classification and the newer North American Industry Classification System classify companies that perform or engage in construction into three subsectors: building construction, heavy and civil engineering construction, and specialty trade contractors. There are also categories for professional services firms (e.g., engineering, architecture, surveying, project management).[10][11]

Building construction

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Military residential unit construction by U.S. Navy personnel in Afghanistan

Building construction is the process of adding structures to areas of land, also known as real property sites. Typically, a project is instigated by or with the owner of the property (who may be an individual or an organisation); occasionally, land may be compulsorily purchased from the owner for public use.[12]

Residential construction

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Units under construction in Brighton, Victoria, Australia

Residential construction may be undertaken by individual land-owners (self-built), by specialist housebuilders, by property developers, by general contractors, or by providers of public or social housing (e.g.: local authorities, housing associations). Where local zoning or planning policies allow, mixed-use developments may comprise both residential and non-residential construction (e.g.: retail, leisure, offices, public buildings, etc.).

Residential construction practices, technologies, and resources must conform to local building authority's regulations and codes of practice. Materials readily available in the area generally dictate the construction materials used (e.g.: brick versus stone versus timber). Costs of construction on a per square meter (or per square foot) basis for houses can vary dramatically based on site conditions, access routes, local regulations, economies of scale (custom-designed homes are often more expensive to build) and the availability of skilled tradespeople.[13]

Non-residential construction

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Construction of the Federal Reserve building in Kansas City, Missouri

Depending upon the type of building, non-residential building construction can be procured by a wide range of private and public organisations, including local authorities, educational and religious bodies, transport undertakings, retailers, hoteliers, property developers, financial institutions and other private companies. Most construction in these sectors is undertaken by general contractors.

Infrastructure construction

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Shasta Dam under construction in June 1942

Civil engineering covers the design, construction, and maintenance of the physical and naturally built environment, including public works such as roads, bridges, canals, dams, tunnels, airports, water and sewerage systems, pipelines, and railways.[14][15] Some general contractors have expertise in civil engineering; civil engineering contractors are firms dedicated to work in this sector, and may specialise in particular types of infrastructure.

Industrial construction

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The National Cement Share Company of Ethiopia's new plant in Dire Dawa

Industrial construction includes offshore construction (mainly of energy installations: oil and gas platforms, wind power), mining and quarrying, refineries, breweries, distilleries and other processing plants, power stations, steel mills, warehouses and factories.

Construction processes

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Some construction projects are small renovations or repair jobs, like repainting or fixing leaks, where the owner may act as designer, paymaster and laborer for the entire project. However, more complex or ambitious projects usually require additional multi-disciplinary expertise and manpower, so the owner may commission one or more specialist businesses to undertake detailed planning, design, construction and handover of the work. Often the owner will appoint one business to oversee the project (this may be a designer, a contractor, a construction manager, or other advisors); such specialists are normally appointed for their expertise in project delivery and construction management and will help the owner define the project brief, agree on a budget and schedule, liaise with relevant public authorities, and procure materials and the services of other specialists (the supply chain, comprising subcontractors and materials suppliers). Contracts are agreed for the delivery of services by all businesses, alongside other detailed plans aimed at ensuring legal, timely, on-budget and safe delivery of the specified works.

Design, finance, and legal aspects overlap and interrelate. The design must be not only structurally sound and appropriate for the use and location, but must also be financially possible to build, and legal to use. The financial structure must be adequate to build the design provided and must pay amounts that are legally owed. Legal structures integrate design with other activities and enforce financial and other construction processes.

These processes also affect procurement strategies. Clients may, for example, appoint a business to design the project, after which a competitive process is undertaken to appoint a lead contractor to construct the asset (design–bid–build); they may appoint a business to lead both design and construction (design-build); or they may directly appoint a designer, contractor and specialist subcontractors (construction management).[16] Some forms of procurement emphasize collaborative relationships (partnering, alliancing) between the client, the contractor, and other stakeholders within a construction project, seeking to ameliorate often highly competitive and adversarial industry practices. DfMA (design for manufacture and assembly) approaches also emphasize early collaboration with manufacturers and suppliers regarding products and components.

Construction or refurbishment work in a "live" environment (where residents or businesses remain living in or operating on the site) requires particular care, planning and communication.[17]

Planning

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Digging the foundation for a building construction in Jakarta, Indonesia

When applicable, a proposed construction project must comply with local land-use planning policies including zoning and building code requirements. A project will normally be assessed (by the 'authority having jurisdiction', AHJ, typically the municipality where the project will be located) for its potential impacts on neighbouring properties, and upon existing infrastructure (transportation, social infrastructure, and utilities including water supply, sewerage, electricity, telecommunications, etc.). Data may be gathered through site analysis, site surveys and geotechnical investigations. Construction normally cannot start until planning permission has been granted, and may require preparatory work to ensure relevant infrastructure has been upgraded before building work can commence. Preparatory works will also include surveys of existing utility lines to avoid damage-causing outages and other hazardous situations.

Some legal requirements come from malum in se considerations, or the desire to prevent indisputably bad phenomena, e.g. explosions or bridge collapses. Other legal requirements come from malum prohibitum considerations, or factors that are a matter of custom or expectation, such as isolating businesses from a business district or residences from a residential district. An attorney may seek changes or exemptions in the law that governs the land where the building will be built, either by arguing that a rule is inapplicable (the bridge design will not cause a collapse), or that the custom is no longer needed (acceptance of live-work spaces has grown in the community).[18]

During the construction of a building, a municipal building inspector usually inspects the ongoing work periodically to ensure that construction adheres to the approved plans and the local building code. Once construction is complete, any later changes made to a building or other asset that affect safety, including its use, expansion, structural integrity, and fire protection, usually require municipality approval.

Finance

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Depending on the type of project, mortgage bankers, accountants, and cost engineers may participate in creating an overall plan for the financial management of a construction project. The presence of the mortgage banker is highly likely, even in relatively small projects since the owner's equity in the property is the most obvious source of funding for a building project. Accountants act to study the expected monetary flow over the life of the project and to monitor the payouts throughout the process. Professionals including cost engineers, estimators and quantity surveyors apply expertise to relate the work and materials involved to a proper valuation.

Financial planning ensures adequate safeguards and contingency plans are in place before the project is started, and ensures that the plan is properly executed over the life of the project. Construction projects can suffer from preventable financial problems.[19] Underbids happen when builders ask for too little money to complete the project. Cash flow problems exist when the present amount of funding cannot cover the current costs for labour and materials; such problems may arise even when the overall budget is adequate, presenting a temporary issue. Cost overruns with government projects have occurred when the contractor identified change orders or project changes that increased costs, which are not subject to competition from other firms as they have already been eliminated from consideration after the initial bid.[20] Fraud is also an issue of growing significance within construction.[21]

Large projects can involve highly complex financial plans and often start with a conceptual cost estimate performed by a building estimator. As portions of a project are completed, they may be sold, supplanting one lender or owner for another, while the logistical requirements of having the right trades and materials available for each stage of the building construction project carry forward. Public–private partnerships (PPPs) or private finance initiatives (PFIs) may also be used to help deliver major projects. According to McKinsey in 2019, the "vast majority of large construction projects go over budget and take 20% longer than expected".[22]

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Construction along Ontario Highway 401, widening the road from six to twelve travel lanes

A construction project is a complex net of construction contracts and other legal obligations, each of which all parties must carefully consider. A contract is the exchange of a set of obligations between two or more parties, and provides structures to manage issues. For example, construction delays can be costly, so construction contracts set out clear expectations and clear paths to manage delays. Poorly drafted contracts can lead to confusion and costly disputes.

At the start of a project, legal advisors seek to identify ambiguities and other potential sources of trouble in the contract structures, and to present options for preventing problems. During projects, they work to avoid and resolve conflicts that arise. In each case, the lawyer facilitates an exchange of obligations that matches the reality of the project.

Apartment complex under construction in Daegu, South Korea

Procurement

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Traditional or design-bid-build

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Design-bid-build is the most common and well-established method of construction procurement. In this arrangement, the architect, engineer or builder acts for the client as the project coordinator. They design the works, prepare specifications and design deliverables (models, drawings, etc.), administer the contract, tender the works, and manage the works from inception to completion. In parallel, there are direct contractual links between the client and the main contractor, who, in turn, has direct contractual relationships with subcontractors. The arrangement continues until the project is ready for handover.

Design-build

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Design-build became more common from the late 20th century, and involves the client contracting a single entity to provide design and construction. In some cases, the design-build package can also include finding the site, arranging funding and applying for all necessary statutory consents. Typically, the client invites several Design & Build (D&B) contractors to submit proposals to meet the project brief and then selects a preferred supplier. Often this will be a consortium involving a design firm and a contractor (sometimes more than one of each). In the United States, departments of transportation usually use design-build contracts as a way of progressing projects where states lack the skills or resources, particularly for very large projects.[23]

Construction management

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In a construction management arrangement, the client enters into separate contracts with the designer (architect or engineer), a construction manager, and individual trade contractors. The client takes on the contractual role, while the construction or project manager provides the active role of managing the separate trade contracts, and ensuring that they complete all work smoothly and effectively together. This approach is often used to speed up procurement processes, to allow the client greater flexibility in design variation throughout the contract, to enable the appointment of individual work contractors, to separate contractual responsibility on each individual throughout the contract, and to provide greater client control.

Design

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In the industrialized world, construction usually involves the translation of designs into reality. Most commonly (i.e.: in a design-bid-build project), the design team is employed by (i.e. in contract with) the property owner. Depending upon the type of project, a design team may include architects, civil engineers, mechanical engineers, electrical engineers, structural engineers, fire protection engineers, planning consultants, architectural consultants, and archaeological consultants. A 'lead designer' will normally be identified to help coordinate different disciplinary inputs to the overall design. This may be aided by integration of previously separate disciplines (often undertaken by separate firms) into multi-disciplinary firms with experts from all related fields,[24] or by firms establishing relationships to support design-build processes.

The increasing complexity of construction projects creates the need for design professionals trained in all phases of a project's life-cycle and develop an appreciation of the asset as an advanced technological system requiring close integration of many sub-systems and their individual components, including sustainability. For buildings, building engineering is an emerging discipline that attempts to meet this new challenge.

Traditionally, design has involved the production of sketches, architectural and engineering drawings, and specifications. Until the late 20th century, drawings were largely hand-drafted; adoption of computer-aided design (CAD) technologies then improved design productivity, while the 21st-century introduction of building information modeling (BIM) processes has involved the use of computer-generated models that can be used in their own right or to generate drawings and other visualisations as well as capturing non-geometric data about building components and systems.

On some projects, work on-site will not start until design work is largely complete; on others, some design work may be undertaken concurrently with the early stages of on-site activity (for example, work on a building's foundations may commence while designers are still working on the detailed designs of the building's internal spaces). Some projects may include elements that are designed for off-site construction (see also prefabrication and modular building) and are then delivered to the site ready for erection, installation or assembly.

On-site construction

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On-site foundation construction

Once contractors and other relevant professionals have been appointed and designs are sufficiently advanced, work may commence on the project site. Some projects require preliminary works, such as land preparation and levelling, demolition of existing structures (see below), or laying foundations, and there are circumstances where this work may be contracted for in advance of finalising the contract and costs for the whole project.

Typically, a construction site will include a secure perimeter to restrict unauthorised access, site access control points, office and welfare accommodation for personnel from the main contractor and other firms involved in the project team, and storage areas for materials, machinery and equipment. According to the McGraw-Hill Dictionary of Architecture and Construction's definition, construction may be said to have started when the first feature of the permanent structure has been put in place, such as pile driving, or the pouring of slabs or footings.[25]

Commissioning and handover

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Commissioning is the process of verifying that all subsystems of a new building (or other assets) work as intended to achieve the owner's project requirements and as designed by the project's architects and engineers.

Defects liability period

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A period after handover (or practical completion) during which the owner may identify any shortcomings in relation to the building specification ('defects'), with a view to the contractor correcting the defect.[26]

Maintenance, repair and improvement

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Maintenance involves functional checks, servicing, repairing or replacing of necessary devices, equipment, machinery, building infrastructure, and supporting utilities in industrial, business, governmental, and residential installations.[27][28]

Demolition

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Demolition is the discipline of safely and efficiently tearing down buildings and other artificial structures. Demolition contrasts with deconstruction, which involves taking a building apart while carefully preserving valuable elements for reuse purposes (recycling – see also circular economy).

Industry scale and characteristics

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Economic activity

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Helicopter view of the Atacama Large Millimeter/submillimeter Array (ALMA) Operations Support Facility (OSF) construction site

The output of the global construction industry was worth an estimated $10.8 trillion in 2017, and in 2018 was forecast to rise to $12.9 trillion by 2022,[29] and to around $14.8 trillion in 2030.[3] As a sector, construction accounts for more than 10% of global GDP (in developed countries, construction comprises 6–9% of GDP),[30] and employs around 7% of the total employed workforce around the globe[31] (accounting for over 273 million full- and part-time jobs in 2014).[32] Since 2010,[33] China has been the world's largest single construction market.[34] The United States is the second largest construction market with a 2018 output of $1.581 trillion.[35]

  • In the United States in February 2020, around $1.4 trillion worth of construction work was in progress, according to the Census Bureau, of which just over $1.0 trillion was for the private sector (split roughly 55:45% between residential and nonresidential); the remainder was public sector, predominantly for state and local government.[36]
  • In Armenia, the construction sector experienced growth during the latter part of 2000s. Based on National Statistical Service, Armenia's construction sector generated approximately 20% of Armenia's GDP during the first and second quarters of 2007. In 2009, according to the World Bank, 30% of Armenia's economy was from construction sector.[37]
  • In Vietnam, the construction industry plays an important role in the national economy.[38][39][40] The Vietnamese construction industry has been one of the fastest growing in the Asia-Pacific region in recent years.[41][42] The market was valued at nearly $60 billion in 2021.[43] In the first half of 2022, Vietnam's construction industry growth rate reached 5.59%.[43][44][45] In 2022, Vietnam's construction industry accounted for more than 6% of the country's GDP, equivalent to over 589.7 billion Vietnamese dong.[46][47] The industry of industry and construction accounts for 38.26% of Vietnam's GDP.[48][49][50] At the same time, the industry is one of the most attractive industries for foreign direct investment (FDI) in recent years.[51][52][53]

Construction is a major source of employment in most countries; high reliance on small businesses, and under-representation of women are common traits. For example:

  • In the US, construction employed around 11.4m people in 2020, with a further 1.8m employed in architectural, engineering, and related professional services – equivalent to just over 8% of the total US workforce.[54] The construction workers were employed in over 843,000 organisations, of which 838,000 were privately held businesses.[55] In March 2016, 60.4% of construction workers were employed by businesses with fewer than 50 staff.[56] Women are substantially underrepresented (relative to their share of total employment), comprising 10.3% of the US construction workforce, and 25.9% of professional services workers, in 2019.[54]
  • The United Kingdom construction sector contributed £117 billion (6%) to UK GDP in 2018, and in 2019 employed 2.4m workers (6.6% of all jobs). These worked either for 343,000 'registered' construction businesses, or for 'unregistered' businesses, typically self-employed contractors;[57] just over one million small/medium-sized businesses, mainly self-employed individuals, worked in the sector in 2019, comprising about 18% of all UK businesses.[58] Women comprised 12.5% of the UK construction workforce.[59]

According to McKinsey research, productivity growth per worker in construction has lagged behind many other industries across different countries including in the United States and in European countries. In the United States, construction productivity per worker has declined by half since the 1960s.[60]

Construction GVA by country

[edit]
List of countries with the largest construction gross value added in 2018
Economy
Construction GVA in 2018 (billions in USD)
(01)  China
 
934.2
(02)  United States
 
839.1
(03)  Japan
 
275.5
(04)  India
 
201.2
(05)  Germany
 
180.5
(06)  United Kingdom
 
154.7
(07)  France
 
138.7
(08)  Canada
 
125.4
(09)  Russia
 
121.2
(10)  Australia
 
111.8
(11)  Indonesia
 
109.7
(12)  South Korea
 
93.0
(13)  Brazil
 
92.6
(14)  Mexico
 
89.0
(15)  Spain
 
80.0
(16)  Italy
 
78.9
(17)  Turkey
 
55.3
(18)  Saudi Arabia
 
40.2
(19)  Netherlands
 
39.5
(20)  Poland
 
39.4
(21)  Switzerland
 
36.3
(22)  United Arab Emirates
 
34.5
(23)  Sweden
 
33.3
(24)  Austria
 
27.2
(25)  Qatar
 
27.0

The twenty-five largest countries in the world by construction GVA (2018)[61]

Employment

[edit]
Ironworkers erecting the steel frame of a new building at Massachusetts General Hospital in Boston
A truck operator at Al Gamil, the largest construction company in Djibouti

Some workers may be engaged in manual labour[62] as unskilled or semi-skilled workers; they may be skilled tradespeople; or they may be supervisory or managerial personnel. Under safety legislation in the United Kingdom, for example, construction workers are defined as people "who work for or under the control of a contractor on a construction site";[63] in Canada, this can include people whose work includes ensuring conformance with building codes and regulations, and those who supervise other workers.[64]

Laborers comprise a large grouping in most national construction industries. In the United States, for example, in May 2023, the construction sector employed just over 7.9 million people, of whom 859,000 were laborers, while 3.7 million were construction trades workers (including 603,000 carpenters, 559,000 electricians, 385,000 plumbers, and 321,000 equipment operators).[65] Like most business sectors, there is also substantial white-collar employment in construction - out of 7.9 million US construction sector workers, 681,000 were recorded by the United States Department of Labor in May 2023 as in 'office and administrative support occupations', 620,000 in 'management occupations' and 480,000 in 'business and financial operations occupations'.[65]

Large-scale construction requires collaboration across multiple disciplines. A project manager normally manages the budget on the job, and a construction manager, design engineer, construction engineer or architect supervises it. Those involved with the design and execution must consider zoning requirements and legal issues, environmental impact of the project, scheduling, budgeting and bidding, construction site safety, availability and transportation of building materials, logistics, and inconvenience to the public, including those caused by construction delays.

Some models and policy-making organisations promote the engagement of local labour in construction projects as a means of tackling social exclusion and addressing skill shortages. In the UK, the Joseph Rowntree Foundation reported in 2000 on 25 projects which had aimed to offer training and employment opportunities for locally based school leavers and unemployed people.[66] The Foundation published "a good practice resource book" in this regard at the same time.[67] Use of local labour and local materials were specified for the construction of the Danish Storebaelt bridge, but there were legal issues which were challenged in court and addressed by the European Court of Justice in 1993. The court held that a contract condition requiring use of local labour and local materials was incompatible with EU treaty principles.[68] Later UK guidance noted that social and employment clauses, where used, must be compatible with relevant EU regulation.[69] Employment of local labour was identified as one of several social issues which could potentially be incorporated in a sustainable procurement approach, although the interdepartmental Sustainable Procurement Group recognised that "there is far less scope to incorporate [such] social issues in public procurement than is the case with environmental issues".[70]

There are many routes to the different careers within the construction industry. There are three main tiers of construction workers based on educational background and training, which vary by country:

Unskilled and semi-skilled workers

[edit]

Unskilled and semi-skilled workers provide general site labor, often have few or no construction qualifications, and may receive basic site training.

Skilled tradespeople

[edit]

Skilled tradespeople have typically served apprenticeships (sometimes in labor unions) or received technical training; this group also includes on-site managers who possess extensive knowledge and experience in their craft or profession. Skilled manual occupations include carpenters, electricians, plumbers, ironworkers, heavy equipment operators and masons, as well as those involved in project management. In the UK these require further education qualifications, often in vocational subject areas, undertaken either directly after completing compulsory education or through "on the job" apprenticeships.[71]

Professional, technical or managerial personnel

[edit]

Professional, technical and managerial personnel often have higher education qualifications, usually graduate degrees, and are trained to design and manage construction processes. These roles require more training as they demand greater technical knowledge, and involve more legal responsibility. Example roles (and qualification routes) include:

  • Architect – Will usually have studied architecture to degree level, and then undertaken further study and gained professional experience. In many countries, the title of "architect" is protected by law, strictly limiting its use to qualified people.
  • Civil engineer – Typically holds a degree in a related subject and may only be eligible for membership of a professional institution (such as the UK's ICE) following completion of additional training and experience. In some jurisdictions, a new university graduate must hold a master's degree to become chartered,[a] and persons with bachelor's degrees may become Incorporated Engineers.
  • Building services engineer – May also be referred to as an "M&E" or "mechanical, electrical, and plumbing (MEP) engineer" and typically holds a degree in mechanical or electrical engineering.[a]
  • Project manager – Typically holds a 4-year or greater higher education qualification, but are often also qualified in another field such as architecture, civil engineering or quantity surveying.
  • Structural engineer – Typically holds a bachelor's or master's degree in structural engineering.[a]
  • Quantity surveyor – Typically holds a bachelor's degree in quantity surveying. UK chartered status is gained from the Royal Institution of Chartered Surveyors.

Safety

[edit]
At-risk workers without appropriate safety equipment

Construction is one of the most dangerous occupations in the world, incurring more occupational fatalities than any other sector in both the United States and in the European Union.[4][72] In the US in 2019, 1,061, or about 20%, of worker fatalities in private industry occurred in construction.[4] In 2017, more than a third of US construction fatalities (366 out of 971 total fatalities) were the result of falls;[73] in the UK, half of the average 36 fatalities per annum over a five-year period to 2021 were attributed to falls from height.[74] Proper safety equipment such as harnesses, hard hats and guardrails and procedures such as securing ladders and inspecting scaffolding can curtail the risk of occupational injuries in the construction industry.[75] Other major causes of fatalities in the construction industry include electrocution, transportation accidents, and trench cave-ins.[76]

Other safety risks for workers in construction include hearing loss due to high noise exposure, musculoskeletal injury, chemical exposure, and high levels of stress.[77] Besides that, the high turnover of workers in construction industry imposes a huge challenge of accomplishing the restructuring of work practices in individual workplaces or with individual workers.[citation needed] Construction has been identified by the National Institute for Occupational Safety and Health (NIOSH) as a priority industry sector in the National Occupational Research Agenda (NORA) to identify and provide intervention strategies regarding occupational health and safety issues.[78][79] A study conducted in 2022 found “significant effect of air pollution exposure on construction-related injuries and fatalities”, especially with the exposure of nitrogen dioxide.[80]

Sustainability

[edit]

Sustainability is an aspect of "green building", defined by the United States Environmental Protection Agency (EPA) as "the practice of creating structures and using processes that are environmentally responsible and resource-efficient throughout a building's life-cycle from siting to design, construction, operation, maintenance, renovation and deconstruction."[81]

Decarbonising construction

[edit]

The construction industry may require transformation at pace and at scale if it is to successfully contribute to achieving the target set out in The Paris Agreement of limiting global temperature rise to 1.5C above industrial levels.[82][83] The World Green Building Council has stated the buildings and infrastructure around the world can reach 40% less embodied carbon emissions but that this can only be achieved through urgent transformation.[84][85]

Conclusions from industry leaders have suggested that the net zero transformation is likely to be challenging for the construction industry, but it does present an opportunity. Action is demanded from governments, standards bodies, the construction sector, and the engineering profession to meet the decarbonising targets.[86]

In 2021, the National Engineering Policy Centre published its report Decarbonising Construction: Building a new net zero industry,[86] which outlined key areas to decarbonise the construction sector and the wider built environment. This report set out around 20 different recommendations to transform and decarbonise the construction sector, including recommendations for engineers, the construction industry and decision makers, plus outlined six-overarching ‘system levers’ where action taken now will result in rapid decarbonisation of the construction sector.[86] These levels are:

  • Setting and stipulating progressive targets for carbon reduction
  • Embedding quantitative whole-life carbon assessment into public procurement
  • Increasing design efficiency, materials reuse and retrofit of buildings
  • Improving whole-life carbon performance
  • Improving skills for net zero
  • Adopting a joined up, systems approach to decarbonisation across the construction sector and with other sectors

Progress is being made internationally to decarbonise the sector including improvements to sustainable procurement practice such as the CO2 performance ladder in the Netherlands and the Danish Partnership for Green Public Procurement.[87][88] There are also now demonstrations of applying the principles of circular economy practices in practice such as Circl, ABN AMRO's sustainable pavilion and the Brighton Waste House.[89][90][91]

See also

[edit]
  • Agile construction – Management system in the construction industry
  • Building material – Material which is used for construction purposes
  • Civil engineering – Engineering discipline focused on physical infrastructure
  • Commissioning (construction) – Process to ensure that all building systems perform according to the "Design Intent"
  • Environmental impact of concrete
  • Impervious surface – Artificial structures such as pavements covered with water-tight materials
  • Index of construction articles
  • Land degradation – Gradual destruction of land
  • List of tallest structures
  • List of tallest structures built before the 20th century
  • Modern methods of construction
  • Outline of construction – Overview of and topical guide to construction
  • Real estate development – Process that creates or renovates new or existing spaces
  • Structural robustness – Ability of a structure to withstand physical strain
  • Umarell – Bolognese slang term

icon Architecture portal icon Engineering portal

Notes

[edit]
  1. ^ a b c In the UK, the Chartered Engineer qualification is controlled by the Engineering Council, and is often achieved through membership of the relevant professional institution (ICE, CIBSE, IStructE, etc).

References

[edit]
  1. ^ "Construction" def. 1.a. 1.b. and 1.c. Oxford English Dictionary Second Edition on CD-ROM (v. 4.0) Oxford University Press 2009
  2. ^ "Construction". Online Etymology Dictionary http://www.etymonline.com/index.php?term=construction accessed 3/6/2014
  3. ^ a b "Global Construction Report 2030". GCP DBA. Retrieved 28 October 2021.
  4. ^ a b c "Commonly Used Statistics: Worker fatalities". Occupational Safety and Health Administration. United States Department of Labor. Retrieved 1 March 2021.
  5. ^ Knecht B. Fast-track construction becomes the norm. Architectural Record.
  6. ^ Chitkara, pp. 9–10.
  7. ^ Halpin, pp. 15–16.
  8. ^ "The Top 250", Engineering News-Record, September 1, 2014
  9. ^ "The Top 400" (PDF), Engineering News-Record, May 26, 2014
  10. ^ US Census Bureau,NAICS Search 2012 NAICS Definition, Sector 23 – Construction
  11. ^ US Department of Labor (OSHA), Division C: Construction
  12. ^ Proctor, J., What is a Compulsory Purchase Order?, Bidwells, published 10 June 2018, accessed 26 November 2023
  13. ^ Marshall, Duncan; Worthing, Derek (2006). The Construction of Houses (4th ed.). London: EG Books. pp. 1–8. ISBN 978-0-08-097112-4.
  14. ^ "History and Heritage of Civil Engineering". ASCE. Archived from the original on 16 February 2007. Retrieved 8 August 2007.
  15. ^ "What is Civil Engineering". Institution of Civil Engineers. Retrieved 15 May 2017.
  16. ^ Mosey, David (2019). Collaborative Construction Procurement and Improved Value. John Wiley & Sons. ISBN 9781119151913.
  17. ^ Willmott Dixon, Working in live environments, accessed 6 May 2023
  18. ^ Mason, Jim (2016). Construction Law: From Beginner to Practitioner. Routledge. ISBN 9781317391777.
  19. ^ Tabei, Sayed Mohammad Amin; Bagherpour, Morteza; Mahmoudi, Amin (2019-03-19). "Application of Fuzzy Modelling to Predict Construction Projects Cash Flow". Periodica Polytechnica Civil Engineering. doi:10.3311/ppci.13402. ISSN 1587-3773. S2CID 116421818.
  20. ^ "North County News – San Diego Union Tribune". www.nctimes.com.
  21. ^ "Global construction industry faces growing threat of economic crime". pwc. Retrieved 16 September 2015.
  22. ^ Alsever, Jennifer (December 2019). "Bots Start Building". Fortune (Paper). New York, New York: Fortune Media (USA) Corporation. p. 36. ISSN 0015-8259.
  23. ^ Cronin, Jeff (2005). "S. Carolina Court to Decide Legality of Design-Build Bids". Construction Equipment Guide. Archived from the original on 2006-10-19. Retrieved 2008-01-04.
  24. ^ Dynybyl, VojtÄ›ch; Berka, Ondrej; Petr, Karel; Lopot, František; Dub, Martin (2015). The Latest Methods of Construction Design. Springer. ISBN 9783319227627.
  25. ^ McGraw-Hill Dictionary of Architecture and Construction, "Start of construction", accessed 8 September 2020
  26. ^ Designing Buildings Wiki, Defects liability period DLP, last updated 17 February 2022, accessed 16 May 2022
  27. ^ "Defense Logistics Agency". DLA.mil. Retrieved 5 August 2016.
  28. ^ "European Federation of National Maintenance Societies". EFNMS.org. Retrieved 5 August 2016. All actions which have the objective of retaining or restoring an item in or to a state in which it can perform its required function. These include the combination of all technical and corresponding administrative, managerial, and supervision actions.
  29. ^ "Global construction set to rise to US$12.9 trillion by 2022, driven by Asia Pacific, Africa and the Middle East". Building Design and Construction. 8 October 2018. Retrieved 29 April 2020.
  30. ^ Chitkara, K. K. (1998), Construction Project Management, New Delhi: Tata McGraw-Hill Education, p. 4, ISBN 9780074620625, retrieved May 16, 2015
  31. ^ "Global Construction: insights (26 May 2017)". Potensis. Retrieved 30 April 2020.
  32. ^ "Construction Sector Employment in Low-Income Countries: Size of the Sector". ICED. Retrieved 3 May 2020.
  33. ^ "Which countries are investing the most in construction?". PBC Today. 25 March 2019. Retrieved 30 April 2020.
  34. ^ Roumeliotis, Greg (3 March 2011). "Global construction growth to outpace GDP this decade – PwC". Reuters Economic News. Archived from the original on 6 November 2020. Retrieved 29 April 2020.
  35. ^ Global Construction Perspectives & Construction Economics (2019), Future of Consultancy: Global Export Strategy for UK Consultancy and Engineering, ACE, London.
  36. ^ Value of Construction Put in Place at a Glance. United States Census Bureau. Accessed: 29 April 2020. Also see Manufacturing & Construction Statistics for more information.
  37. ^ "Armenian Growth Still In Double Digits", Armenia Liberty (RFE/RL), September 20, 2007.
  38. ^ "Tầm quan trọng cá»§a ngành xây dá»±ng đối vá»›i sá»± phát triển cá»§a Vùng kinh tế trọng Ä‘iểm phía Nam". Tạp chí Kinh tế và Dá»± báo - Bá»™ Kế hoạch và Đầu tư (in Vietnamese). Retrieved 2024-02-01.
  39. ^ "Xây dá»±ng là lÄ©nh vá»±c quan trọng, mang tính chiến lược, có vai trò rất lá»›n trong phát triển kinh tế - xã há»™i". toquoc.vn (in Vietnamese). Retrieved 2024-02-01.
  40. ^ "Ngành Xây dá»±ng - hành trình 60 năm phát triển". Cục giám định nhà nước về chất lượng công trình xây dá»±ng (in Vietnamese). Retrieved 2024-02-01.
  41. ^ "Topic: Construction industry in Vietnam". Statista. Retrieved 2024-02-01.
  42. ^ "Kinh tế Việt Nam 2023: Nhiều Ä‘iểm sáng nổi bật". Vietnam Business Forum – Liên Ä‘oàn Thương mại và Công nghiệp Việt Nam-Kinh tế - Thị trường. 2023-04-12. Retrieved 2024-02-01.
  43. ^ a b "The Growth of the Construction Industry in Vietnam". www.researchinvietnam.com. Retrieved 2024-02-01.
  44. ^ "Tốc độ tăng trưởng ngành xây dá»±ng tăng 4,47% so vá»›i cùng kỳ". baochinhphu.vn (in Vietnamese). 2023-07-06. Retrieved 2024-02-01.
  45. ^ "9 tháng năm 2022, ngành Xây dá»±ng tăng trưởng 5%-5,6% so vá»›i cùng kỳ năm trước". Tạp chí Kinh tế và Dá»± báo - Bá»™ Kế hoạch và Đầu tư (in Vietnamese). Retrieved 2024-02-01.
  46. ^ "Topic: Construction industry in Vietnam". Statista. Retrieved 2024-02-01.
  47. ^ "Kinh tế Việt Nam năm 2022 và triển vọng năm 2023". www.mof.gov.vn. Retrieved 2024-02-01.
  48. ^ "World Bank Open Data". World Bank Open Data. Retrieved 2024-02-01.
  49. ^ Hoàng, Hiếu (2022-02-12). "Chuyển nhà Hà Ná»™i". kienvang.vn (in Vietnamese). Retrieved 2024-02-01.
  50. ^ Ngọc, Dương (2023-02-25). "Tăng trưởng GDP: Kết quả 2022, kỳ vọng 2023". Nhịp sống kinh tế Việt Nam & Thế giới (in Vietnamese). Retrieved 2024-02-01.
  51. ^ "Vietnam attracts over 39,100 FDI projects with registered capital of nearly 469 billion USD so far | Business | Vietnam+ (VietnamPlus)". VietnamPlus. 2024-01-15. Retrieved 2024-02-01.
  52. ^ "Đầu tư trá»±c tiếp nước ngoài và vấn đề phát triển kinh tế - xã há»™i ở Việt Nam". mof.gov.vn. Retrieved 2024-02-01.
  53. ^ "Đầu tư trá»±c tiếp nước ngoài vào lÄ©nh vá»±c xây dá»±ng và bất động sản - thá»±c trạng và những vấn đề đặt ra - Tạp chí Cá»™ng sản". tapchicongsan.org.vn. Retrieved 2024-02-01.
  54. ^ a b "Labor Force Statistics from the Current Population Survey". US Bureau of Labor Statistics. 2019. Retrieved 30 April 2020.
  55. ^ "Industries at a glance: Construction: NAICS 23". US Bureau of Labor Statistics.
  56. ^ "TED: The Economics Daily (March 3, 2017)". US Bureau of Labor Statistics. Retrieved 30 April 2020.
  57. ^ Rhodes, Chris (16 December 2019). Briefing Paper: Construction industry: statistics and policy. London: House of Commons Library.
  58. ^ Rhodes, Chris (16 December 2019). Briefing Paper: Business statistics. London: House of Commons Library.
  59. ^ "Construction industry just 12.5% women and 5.4% BAME". GMB Union. 24 October 2019. Retrieved 30 April 2020.
  60. ^ "The construction industry's productivity problem". The Economist. Retrieved 2017-08-21.
  61. ^ Source: National Accounts Estimates of Main Aggregates | United Nations Statistics Division. Gross Value Added by Kind of Economic Activity at current prices – US dollars. Retrieved 26 June 2020.
  62. ^ "Construction worker definition and meaning | Collins English Dictionary". www.collinsdictionary.com. Retrieved 2018-06-09.
  63. ^ "Are you a construction worker? Construction (Design and Management) Regulations 2015 (CDM 2015) – What you need to know". Health and Safety Executive. HSE. Retrieved 22 April 2022.
  64. ^ "Construction Worker – General". Canadian Centre for Occupational Health and Safety. CCOHS. Retrieved 22 April 2022.
  65. ^ a b "May 2023 National Industry-Specific Occupational Employment and Wage Estimates - Sector 23 - Construction". US Bureau of Labor Statistics. United States Department of Labor. Retrieved 7 January 2025.
  66. ^ Joseph Rowntree Foundation, Local labour in construction: tackling social exclusion and skill shortages, published November 2000, accessed 17 February 2024
  67. ^ Macfarlane, R., Using local labour in construction: A good practice resource book, The Policy Press/Joseph Rowntree Foundation, published 17 November 2000, accessed 17 February 2024
  68. ^ Heard, E., Evaluation and the audit trail, Bevan Brittan, published 8 June 2016, accessed 31 December 2023
  69. ^ Dawn Primarolo, Construction Industry: Treasury written question – answered at on 19 April 2004, TheyWorkForYou, accessed 29 April 2024
  70. ^ Sustainable Procurement Group, REPORT AND RECOMMENDATIONS OF THE SUSTAINABLE PROCUREMENT GROUP, January 2003, paragraph 8.4, accessed 29 April 2024
  71. ^ Wood, Hannah (17 January 2012). "UK Construction Careers, Certifications/Degrees and occupations". TH Services. Archived from the original on 4 March 2012. Retrieved 4 March 2012.
  72. ^ "Health and safety at work statistics". eurostat. European Commission. Retrieved 3 August 2012.
  73. ^ Garza, Elizabeth (10 April 2019). "Construction Fall Fatalities Still Highest Among All Industries: What more can we do? (April 10, 2019)". NIOSH Science blog. Centers for Disease Control and Prevention. Retrieved 1 March 2021.
  74. ^ "Construction statistics in Great Britain, 2021" (PDF). HSE. Health & Safety Executive. Archived from the original (PDF) on 26 January 2022. Retrieved 19 April 2022.
  75. ^ "OSHA's Fall Prevention Campaign". Occupational Safety and Health Administration. Retrieved 6 August 2012.
  76. ^ "The Construction Chart Book: The US Construction Industry and its Workers" (PDF). CPWR, 2013. Archived from the original (PDF) on 2016-05-08. Retrieved 2014-04-08.
  77. ^ Swanson, Naomi; Tisdale-Pardi, Julie; MacDonald, Leslie; Tiesman, Hope M. (13 May 2013). "Women's Health at Work". National Institute for Occupational Safety and Health. Retrieved 21 January 2015.
  78. ^ "CDC – NIOSH Program Portfolio : Construction Program". www.cdc.gov. 2018-04-05. Retrieved 2018-04-07.
  79. ^ "CDC – NIOSH – NORA Construction Sector Council". www.cdc.gov. 2017-12-01. Retrieved 2018-04-07.
  80. ^ "Air pollution increases the likelihood of accidents in construction sites". London School of Economics Business Review. 6 Sep 2023. Retrieved 15 Sep 2023.
  81. ^ "Basic Information | Green Building |US EPA". archive.epa.gov. Retrieved 2018-12-11.
  82. ^ "The Paris Agreement". United Nations.
  83. ^ Donati, Angelica Krystle (February 6, 2023). "Decarbonisation And The Green Transition In Construction: Logical, Cost-Effective, And Inevitable". Forbes.
  84. ^ "Bringing embodied carbon upfront". World Green Building Council.
  85. ^ "Bringing embodied carbon upfront" (PDF). World Green Building Council.
  86. ^ a b c "Decarbonising construction". National Engineering Policy Centre.
  87. ^ "What is the Ladder". The CO2 Performance Ladder.
  88. ^ "Strategy for green public procurement". Economy Agency of Denmark.
  89. ^ "The Forum on Sustainable Procurement". Ministry of Environment Denmark. Archived from the original on 2023-05-24. Retrieved 2023-05-24.
  90. ^ Chua, Geraldine (May 4, 2018). "Designing the Dutch way". Architecture & Design.
  91. ^ Wainwright, Oliver (7 July 2014). "The house that 20,000 toothbrushes built". The Guardian.

 

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Frequently Asked Questions

The Smoke Development Index (SDI) is a numerical value that indicates the amount of smoke produced by a material during a fire. It is measured using standardized tests, such as the ASTM E84 or UL 723, and helps assess the potential hazard posed by smoke in building fires.
A lower SDI indicates less smoke production, which can improve occupant safety by reducing visibility obstruction, decreasing toxic gas inhalation risks, and facilitating safer evacuation during a fire. Building codes often set maximum SDI limits for materials used in construction to enhance safety.
Materials like gypsum board, mineral wool insulation, and certain types of fire-resistant coatings typically have low SDIs. These materials produce less smoke when exposed to fire, contributing to safer conditions for building occupants.
SDIs are determined through standardized tests conducted in laboratories. The most common test method is the Steiner Tunnel Test (ASTM E84 or UL 723), where a sample of the material is exposed to a controlled flame, and sensors measure the smoke density over time to calculate the SDI.
Yes, many countries have regulatory standards that specify maximum allowable SDIs for different types of building materials. For example, in the United States, the International Building Code (IBC) references standards like NFPA 101 and NFPA 255, which set limits on smoke development for various applications within buildings to ensure occupant safety.