مقاله انگلیسی رایگان در مورد تولید بتن سبز با استفاده از ضایعات بازیافتی – امرالد 2017

The construction sector is not only a massive consumer of nonrenewable resources, but also a massive producer of wastes (Bakhoum and Brown, 2011). Concrete is the leading construction material with an annual global production of about 3.8 billion cubic meters (i.e. ~1.5 tones/capita) (Garas, Allam and Bakhoum, 2014). Sustainability is concerned with the balanced and efficient consumption of resources, to achieve the social and economic needs of the society without much harm to the environment. Green concrete (GC) is a term that is used for environmentally friendly types of concrete mixes, in which a portion of the nonrenewable mix ingredients, is replaced by recycled ecofriendly wastes and byproducts (Nielsen, and Glavind 2007, Gursel et al. 2016). Accordingly, GC has the potential to meet both economic and environmental objectives of sustainable development. The production of GC incorporates replacement of any of the traditional ingredients, such as fine aggregates, coarse aggregates, and quantity of cement. Metakaolin, granulated blast furnace, fly ash, and silica fume are examples of industrial byproducts and wastes and can be used as pozzolanic materials to replace a portion of the GC cement mixture. Construction refuse such as recycled crushed concrete has the potential to replace a portion of coarse and fine aggregate content in the mixture of GC. The use of these industrial and construction refuse and byproducts reduce the environmental costs of their traditional disposal, and also reduce the production costs of new raw materials that are used in traditional concrete mixes. The main objective of this research is to investigate the characteristics of concrete when considering recycling demolition and industrial refuse as a substitute for aggregates while reducing the cement content in traditional concrete mixes. The following section investigates efforts in literature directed towards the reuse of construction debris and byproducts in the production of GC mixes.