Development of High-Performance Green Concrete using Demolition and Industrial Wastes for Sustainable Construction

Growth of population, increasing urbanization and industrialization contributed to fast consumption of available natural resources and generation of considerable amount of wastes. The recycling of wastes in concrete industry will lead to greener and sustainable concrete, unless they are proven harmful by testing. This study was conducted to investigate the feasibility of recycling air-cooled slag (ACS) as a substitute of natural coarse aggregate on the strength and durability of high performance concrete containing natural aggregates or a blend of natural aggregates and recycled concrete aggregate (RCA) as a new approach to massively recycle these wastes for sustainable construction. The durability of concrete was evaluated by assessing abrasion resistance, water permeability, behavior of concrete after exposure to wetting and drying cycles, resistance to sulfate attack, and alkali-aggregate reaction. The results indicated that it is feasible to produce high performance concrete with satisfactory properties by using recycled aggregates and supplementary cementing material. ACS can be recycled successfully as a coarse aggregate in high performance concrete as it offers an approach to solve the problems arising from its disposal; in the meantime modified properties are added to the concrete. In general, concrete containing ACS had better performance compared to concrete entirely made with natural aggregates. Furthermore, the use of ACS is particularly beneficial for concrete containing RCA as it attenuated the negative impacts of RCA on concrete strength and durability without the need to increase the cement content. (Dina M. Sadek and Mohamed M. El-Attar. Development of High-Performance Green Concrete using Demolition and Industrial Wastes for Sustainable Construction. Journal of American Science 2012; 8(4):120-131). (ISSN: 1545-1003). http://www.americanscience.org. 16

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