INFLUENCE OF STEEL FIBER VOLUME FRACTION ON THE FRACTURE PERFORMANCE OF HIGH STRENGTH CONCRETE

Through the three-point bending test on notched beams of steel fiber reinforced high-strength concrete(SFHSC) with the relative notch depth of 0.2,0.3,0.4 and 0.5,the effect of the steel fiber volume fraction upon fracture properties of high strength concrete was studied.The results show that under the four relative depth conditions the SFRC fracture toughness and fracture energy significantly increase as the steel fiber volume fraction increases.Based on the statistical analysis of test results,the formula were established for the relationship of the fracture toughness and fracture energy with the tensile strength of steel fiber reinforced high strength concrete respectively.