Strength of recycled aggregate concrete for structural uses

Author(s): S.C. Paul, G.P.A.G. van Zijl
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 480- 481
Total Pages: 2
Language: English

The suitability of using Recycled Concrete Aggregate (RCA) in structural concrete based on a better understanding of its strength and stiffness is reported here. Concrete containing RCA at replacement percentages of 0%, 30% and 100% was investigated experimentally for compressive strength classes in the range 30–40 MPa, using three sources of RCA. It was found that RCA replacement by 30% of Normal Aggregate (NA) does not show any significant difference in strength and stiffness compared to concrete containing 100% NA in concrete. Even though RCA100% replacement does show reduced strength and stiffness, this is not significant and can be compensated in standard ways. Concrete produced with the RCA from the three sources showed that better quality RCA in terms of lower absorption and higher strength produces better concrete, although the strength and stiffness improvement was not significant in this low-moderate strength class of 30–40 MPa. Based on the results, recommendations are made on limits for RCA absorption, flakiness index, density and 10% FACT values for this class of concrete made with RCA 30%.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00