Abstract
The properties of recycled fine aggregate(RFA) from waste recycled aggregate concrete (RAC) were determined. In this study, five series of parental concrete mixtures using natural coarse and fine aggregates were prepared, which had the same target slump value from 35mm to 50mm and different compressive strengths ranging from 25MPa to 60 MPa. These concretes were used as recycled aggregates to prepare RACs with a compressive target strength of 30MPa. After that, these RACs were used as secondly recycled aggregates to produce RACs with the same compressive target strength of 30MPa. The physical properties of RFAs including apparent density, compacted bulk density and water absorption were tested. At the same time, fineness modulus of natural fine aggregates and RAFs were calculated and their mineral compositions were analyzed. The results showed that RAFs from waste RACs were not adequate to structural concrete alone because they belonged to coarse tape and their mineral compositions were adverse to the best growth of strength of RACs.
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