EXPERIMENTAL RESEARCH ON CRACK WIDTH OF STEEL FIBERS REINFORCED SELF-CONSOLIDATING CONCRETE BEAMS

Based on a four-point bending test of nine steel fiber reinforced self-consolidating concrete (SFRSCC) beams, the influencing factors, such as the volume fraction of steel fibers and reinforcement ratio, on the crack pattern, crack width and crack spacing were investigated. The results showed that adding steel fiber into reinforced SCC beams could restrict the crack development effectively. With 0.38% and 0.64% steel fiber by volume, the maximum crack width of the SFRSCC beam was decreased by 31% ~ 56%, the mean crack spacing was decreased by 15% ~ 28%, and the strain in steel bar was decreased by 40% ~ 56%. Finally, considering the fiber distribution across the cracks and the stress transfer mechanism of steel fiber, the maximum crack width calculation method of SFRSCC beams was proposed. Compared with the methods of MC 2010、RILEM TC-162 TDF and CECS 38: 2004, the proposed method fit better with the test results. Thus, the proposed formula of maximum crack width can be used for the analysis and design of steel fiber reinforced SCC beam.