VOLUME STABILITY OF CONCRETE CONTAINING RECYCLED FINE AGGREGATE

Author(s): Atef Badr and Mike Gadsden
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 626-633
Total Pages: 961
Language : English

Abstract: Sustainable construction has become a great concern for the producers and users of the major construction materials such as concrete, steel and timber. To this end, many concrete promoters, technologists and researchers are encouraging higher level of utilisation of recycled aggregate (RA) in concrete in order to enhance its environmental credentials. However, higher level of utilisation - particularly recycled fine aggregate (RFA)- could adversely affect certain properties. Therefore, an experimental research has been carried out to investigate the effect of utilising recycled fine aggregate in the production of concrete on its volume stability due to temperature and moisture variations. The results showed that concrete specimens containing RFA exhibited slightly greater expansion compared to the control mix when exposed to cycles of thermal changes alternating between hot (40°C) and cold (20°C) ambient temperatures. When exposed to cycles of wetting and drying, the deformation in specimens containing RFA showed greater fluctuation compared to control specimens. However, compressive strength of specimens containing RFA was almost identical to that of the control mix, particularly at early ages. It is concluded that properly designed concrete mixes containing RFA could have some properties comparable to those of mixes without RAF although other properties could be adversely affected.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00