The use of recycled concrete aggregate in structural concrete

TRL has completed a research project for the Highways Agency to investigate the use of recycled concrete aggregate (RCA) in structural concrete. The objectives of the project were to update clauses 1702 and 1703 of the Specification for Highway Works (SHW) and to draft an Advice Note to permit the use of RCA in concrete highway structures. A review of the literature suggested that RCA combined with natural sand are suitable for structural concrete. An experimental programme was devised to investigate the engineering properties and durability of concrete mix designs in which proportions (up to 100%) of the natural coarse aggregates were replaced with RCA. The durability was assessed primarily by accelerated laboratory testing and some larger specimens have been cast for long term natural exposure. This report presents the results of the investigation. It has been shown that it is possible to design structural concrete mixes with up to 100% of the natural aggregates replaced with RCA. The use of RCA will affect the engineering properties which have to be taken into account in the design. The freeze/thaw performance of mixes containing RCA was generally at least as good as those with natural aggregates. Further periods of exposure are required to assess the resistance to ingress of chlorides and carbon dioxide. (A)


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  • Accession Number: 01011682
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 1-84608-036-3
  • Files: ITRD
  • Created Date: Dec 19 2005 3:25PM