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at the site as more storage may be required which may need temporary structures or heating to keep the products in the right conditions, this adding to the amount of waste generated.

MANUFACTURING DEFECTS:
During manufacturing, the manufacturer produces only a specific size, but the client may require a slightly different size, therefore the material is trimmed down on site. This creates a large amount of wastage. Also a poor manufacturer may produce a number of low quality products that can't be used.

SITE MANAGEMENT:
Site management could also be a factor that courses waste. Time management and storage of material on site could course waste if the site management is not as good as it should be. If materials are not used within a limited time period or if when they are not stored properly, its properties might change and therefore may not be suitable for the project. An example of this is if concrete arrives on site and is forced to wait for the site to be ready, then the concrete might start to set and therefore can't be used.

TYPES OF WASTE
There are two main types of waste in the construction industry, this include solid waste (which may be recycled or taken to landfill) or gasses waste which may be a pollutant.

Gaseous waste will be generated from a number of different sources. In the construction process a large amount of plant and heavy machinery will be used. Most of this machinery will be driven by diesel engines which will generate exhaust gases, these gases will be a waste product generated in the contraction process. Waste gasses can also indirectly be generated due to the construction industry, gasses may be produced in the fabrication and manufacturing of different products that are used.

Solid waste can also be split into sections, waste that can be recycled or re-used and waste which will be put into landfill. There are a large number of different waste products that could be generated from the construction industries such as, timber, metals, concrete and more serious waste, which may be harder to recycle and reuse. These wastes include plastics, plaster boards and asbestos.

How much Waste does the Construction Industry Produce?
Construction and demolition (C&D) waste includes brick, concrete, hardcore, subsoil and topsoil, but it can also contain quantities of timber, metal, plastics and occasionally special (hazardous) waste materials. Wastes occur from the construction, repair, maintenance and demolition of buildings and structures.

The Construction Industry Research and Information Association (CIRIA) have reported that an estimated 72.5 million tonnes of construction and demolition waste are produced annually. This is around 17.5 % of the total waste produced in the U.K. Furthermore, 13 million tonnes of construction materials are delivered to sites in the U.K. and thrown away unused every year. This is not sustainable.[3]

建筑垃圾对环境的影响——EFFECTS OF CONSTRUCTION WASTE ON THE ENVIRONMENT

The two main types of waste generated by the construction industry are solid wastes and gaseous wastes. Liquid wastes may also be generated during construction processes, such as cleaning, but the effect of such wastes is minimal and generally local to a particular site. Gaseous waste is a sub-product from the use of m本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。