Abstract
This chapter deals with the environmental impact, case studies and standards and specifications relating to the use of recycled aggregates (RA) as a partial or full replacement of natural aggregate in concrete and geotechnical applications, as well as in unbound, hydraulically bound and bituminous bound road pavement applications. Recycled concrete aggregate (RCA) has been most commonly addressed in all these cases. The chemical composition of RA is similar to that of concrete mixes, owing to the presence of cement paste residue. The leaching behaviour of RA is pH dependent and it can be affected by its particle size. The material is generally safe for use in construction applications provided it is not contaminated. A considerable number of case studies have shown that RA has been successfully used in real field applications without compromising the intended properties and functionality. The use of RA, in particular RCA, in coarse fraction form, has been allowed in concrete, geotechnical and road pavement applications in many standards and specifications, including those in Australia, European countries and the United States.
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