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Importance of construction sustainability in general
Importance of construction sustainability in general
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Sustainable Development in Concrete Production
According to the Department of Environment (Environ, 2007), sustainable development is defined as “development that meets the needs of the present without compromising the ability of future generations to meet their own needs”. For example, the use of sustainable concrete in future developments leads to a more durable and economical structure, with significant environmental benefits.
Concrete, a crucial material in building construction, is the world’s most produced material. However, the production of Portland cement, an essential ingredient of concrete, involves energy intensive processes, which leads to significant amounts of CO2 emissions (calcium carbonate + heat = calcium oxide + carbon dioxide) (Ecocem, 2001). The global cement industry is responsible for around 7 per cent of all CO2 emissions and around 4 per cent of global warming (Ecocem, 2001). Each year, approximately one ton of concrete is placed for every man, women and child (West, 2013). To date, approximately 7.2 Billion people inhabit the planet, with a projected population of around 9 Billion for 2040 (CSO, 2013). Therefore, global placement of concrete is around 7.2 Billion tons with a projected usage of 9 Billion tons. Such vast amounts of concrete require vast amounts of natural resources for aggregate and cement production.
Figure 1 Typical concrete composition (De Brito and Saikia, 2012).
Cement production increases at around 3 per cent per year. One cubic meter of concrete requires approximately 280kg/m3 – 400kg/m3 of cement clinker (West, 2013), with a CO2 footprint of approximately 0.96 t for every ton of cement clinker produced (Ecocem, 2001). Therefore, global CO2 emissions for the production of ceme...
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Construction industry is one of the significant industries in Canada. The low interest rates in Canada fuelled the demand of housing, which brings the Canadian construction industry with a CAGR of 2% between 2008 and 2012 (Companies and Markets, 2013). The fact is that building construction has a considerable effect on the environment. It is a major consumer of raw materials, land and energy, as well as generates a mass of Greenhouse gas and other pollution (USA EPA, 2008). According to the data from Statistics Canada (2012), the construction sector produced 2.1% of total Canadian industrial sector’s GHG emissions in 2008. The purpose of this project is to convince the construction companies in Waterloo region to adapt feasible best practices for GHG emission reduction during construction process. Therefore, guidance for GHG emissions calculation and best practices should be determined firstly.
Almost no other material manages to carry such contradictory associations. Stigmatized on one hand, celebrated on the other, it evokes highly diverse reactions this material is cement. Cement is a finely ground powder binder, a substance that sets and hardens and can bind other materials together, when mixed with water forms a hardening paste of calcium silicate hydrates and calcium aluminates hydrates. Cement is used in mortar and concrete (bulk rock-like building material made from aggregate, sand, and water). By modifying the raw material mix and the temperatures utilized in manufacturing, compositional variations can be achieved to produce cements with different properties. Cement, chemically speaking, is a product including lime as the
In recent development, sustainability has become an integral concern in the performance of architectural principles and technology, in which conscious approaches to energy and ecological conservation involves strategies during the design, construction, and operation of buildings. According to the U.S. Energy Information Administration, the Building Sector is the largest contributor to most of the energy consumed: in the United States by itself, buildings consume 47.6% of all energy produced and is responsible for 44.6% of CO2 emissions in 2010 (“Problem…” 1). In terms of sustainability, initial decisions in the design process can significantly help deliver results. Evaluations and explorations through the impact of materials, such as concrete, wood, bricks, masonry, and steel, can help improve reductions in energy through its applicability to a building. While wood and steel are simply identified for their strength, durability, and functionality in structures, accentuating these materials’ embodied energies and recyclability offer a more comprehensive understanding of their overall impact in sustainability — and ultimately reveal how both have advantages and disadvantages depending on the context.
Concrete and masonry products contain silica sand and rock containing silica. Since these products are primary materials for construction, construction workers may be easily exposed to respirable crystalline silica during activities such as the following:
In figure (2.26), eight equations proposed by different researchers have been plotted for lightweight concrete, as shown in table (2.12). The experimental splitting tensile strength values are calculated as follows: Eq. (2.23), (2.24), (2.25) (2.26) for cube specimens and (2.27), (2.28), (2.29), (2.30) for cylinder specimens. The splitting tensile strength of lightweight concrete for Eq. (2.23) ranged from 2.8 – 3.5 MPa, as shown in figure (2.23).
Now a days HPC is expensive than conventional concrete. It require additional materials in some quantities as to meet specified performance.These additional materials are cement,silica fume,...
Concrete is one of the most widely used construction material in the world. The reason for this is because concrete is strong, easy to make and can be molded into various shapes and sizes. Besides that, concrete is cheap, affordable and is readily mix.
Sustainable concrete materials and sustainable steel reinforcement have been introduced to civil engineers to get closer to the sustainable development. Sustainable buildings constructed with use of these materials have shown an increased service life and the final cost has been reduced due to them.
“Sustainable Development: At its heart, sustainable development is the simple idea of ensuring a good quality of life for everyone, now and for generations to come. It is about living within the carrying capacity of the environment so that how we live, work and enjoy leisure activities, which do not harm or put undue pressures on the environment. It is about ensuring everyone has the opportunity to have a decent education, a quality environment that they take pride in, good health and a decent job (n.p, 2014)”
Cement is a finely ground powder binder, a material that sets and hardens and can bind other materials together, when mixed with water it forms a hardening paste of calcium silicate hydrates and calcium aluminates hydrates. it evokes highly diverse reactions. Cement is used in mortar (a combination of sand and roughly burnt gypsum) and concrete (bulk rock-like building material made from aggregate, sand, and water). By modifying the raw material mix and the temperatures utilized in manufacturing, compositional variations can be achieved to produce cements with different qualifications. Cement, chemically speaking, is a product including lime as the primary ingredient, but it is far from the first material used for cementation. The Babylonians and Assyrians used bitumen to bind together burnt brick or alabaster
Concrete is a composite material composed mainly of water, aggregate, and cement. The desired physical properties of the finished material can be achieved by including additives and reinforcements in the mixture. Generally, fibers used in concrete are to control cracks, shrinkage and to reduce permeability. Fibers also show excellent resistance towards impact and abrasion. SIFCON (slurry infiltrated fiber reinforced concrete) is one of the recently developed construction material. It is a special type of fiber reinforced concrete with high fibre content. It is a unique construction material possessing high strength, as well as large ductility and it contains excellent potential for structural applications when accidental or abnormal loads are encountered.
Saving energy, promoting future development, and decreasing environmental waste when Glass recycling in pavements construction. Glass is a transparent material that is brittle, rigid and simple to pulverize to frame agreeable particles for applications of roads construction (Wu, S. et al.,
In class we discussed what sustainable development meant to us; each group had its own definition. Our group’s definition was that sustainable development is for the long term for future generations, for the basic needs such as food, clothing, shelter, and job. The basic will increase over time and our resources will diminish, which why sustainable development is important. Sustainable development is important for future generations so that they end up with a world better than ours. Sustainable development is achievable if society works together to meet everyone’s basic needs and create a better world.
The notion of sustainable city has mounted a paramount place in the contemporary urban planning. In the world Conservation strategies in1980, the concept of sustainable development was firstly introduced.
Sustainable development means that the present generations should be able to make use of resources to live better lives in such a manner that it doesn’t compromise the ability of future generations to survive and make better lives for themselves as well. For sustainable development to occur, there needs to be sustainable economic, ecological and community development. Society needs to be educated about ways in which they can use resources, especially natural, in such a manner that it doesn’t cause harm to the environment and put future generations lives at risk.