INVESTIGATION ON THE TEST OF FLEXURAL STRENGTH OF STEEL FIBER RECYCLED CONCRETE

The flexural strength of steel fiber recycled concrete (SRC) with different recycled coarse aggregate(RCA) replacement ratio and different water/cement(W/C) ratios was investigated,these SRC were mixed with RCA in weight percentage of(referred to total coarse aggregate) 0%,30%,50%,70% and 100%. Firstly,the basic performances of RCA were undertaken in the interior tests,mainly including the density,Los Angeles abrasion loss and crush index,etc.,and then the flexural strength of SRC has also been undertaken.The results indicated that the flexural strength of SRC can be greatly influenced by the content of RCA and different(W/C) ratios.On condition that the design flexural strength was 6.0 MPa and the content of steel fiber was 1.0%,when the content of RCA is less than 50% and W/C ratios is from 0.44 to 0.47,the 28d flexural strength of SRC is very approaching to the plain steel fiber concrete.However,if the data were not in these ranges,the flexural strength of SRC would have a remarkable decrease.Finally,the SRC content with 30% RCA has been applied in a trial pavement section,the data of flexural strength from in-situ could have met the demand of grade I.