Abstract
When the recycled aggregate is crushed, many micro-cracks can be observed and some grout can remain on it. The aggregate therefore severely absorbs water when it is later mixed with concrete. The impact of water-binder ratio on strength becomes different from that of the ordinary concrete, and the ratio can no longer be used to evaluate the strength accurately. To solve this problem, this paper describes the mix proportion design method of recycled aggregate concrete, including the requirement of mix proportion design, the calculation for mixing proportion parameters and the technical requirements of recycled aggregate, natural aggregate, fly ash and admixtures. The manufacture of specimens is also described. This work provides guidance for the proper design of mix proportion of recycled aggregate concrete.
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