Abstract
With approximately 20 billion tonnes manufactured in the world each year, concrete is the world’s most widely used composite. The extraction of some of its main ingredients, aggregate – sand, gravel and crushed rock – on this scale has serious environmental, economic and social consequences. A similar quantity of construction and demolition waste is also produced annually, putting increasing pressure on landfill resources. Recycling of waste concrete as an aggregate for new concrete components has the potential to help mitigate both these impacts and contribute to more sustainable construction. In this chapter, we give a brief overview of concrete as a composite material and make the case for recycling concrete. The likely future trends in, and drivers for, recycling concrete as aggregate are discussed and a detailed report on the state of the art is presented.
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