钢纤维体积率对高强混凝土断裂性能的影响

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

通过对相对切口深度为0.2、0.3、0.40、.5的钢纤维高强混凝土三点弯曲试验,研究钢纤维体积率对高强混凝土断裂性能的影响。结果表明:在相对切口深度为0.20、.3、0.4、0.5的条件下,随着钢纤维体积率的增大,钢纤维高强混凝土断裂韧度和断裂能均显著增加。通过对试验结果的统计分析,分别建立断裂韧度、断裂能与劈拉强度之间的关系式。

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.