This paper written by some of the world’s leading exponents on the use of recycled and secondary aggregates provides a brief overview of the use of recycled and secondary aggregates for new concrete construction. It is based on a substantial review, dissection and repackaging of the current known knowledge in the field and is based on authors’ own research, findings and experience. The paper, in particular, draws upon recent knowledge that has been generated in the past five years as standards and specifications have finally started to provide a route by which these materials can be more readily assimilated into construction. The paper covers production and processing of recycled aggregates, developments in international standards, the effect of recycled aggregates on strength, deformation characteristics and durability of concrete, and concludes with three international case studies in which recycled aggregates have been used in structural and high performing concrete.