investigation on the mechanical properties of fiber reinforced recycled concrete

the flexural strength of conventional concrete material is known to be enhanced by incorporating a moderate volume-fraction of randomly distributed fibers. however, there is limited information on describing the influence of fiber volume-fraction on the compressive and flexural strength of recycled coarse aggregate concrete (rca-c) material. this paper reports on experimental test results of the rca-c material replaced with 0, 30, 50 and 100% recycled aggregate and 0, 0.5, 1 and 1.5% steel fiber volume fraction. three-point flexural tests of notched prism specimens were completed. the mechanical properties in compression were characterized using cube specimens. significant improvement in compressive and flexural strength of rca-c was found as fiber content increased from 0 to 1.5%. the experimental test results of rca-c were further evaluated to investigate the influence of fiber content on flexural toughness. according to test results, the addition of steel fibers to rca-c material appreciably increased the flexural toughness.