中文摘要：

通过超高性能纤维混凝土坍落度和力学性能试验,研究了纤维种类和掺量对其工作性和弯拉性能的影响,并探讨了钢纤维与聚乙烯醇纤维的混杂效应对其抗压强度、折压比和拉压比的影响。结果表明：纤维明显降低超高性能混凝土的工作性;超高性能纤维混凝土的抗压强度随钢纤维的掺量提高变化不大,随聚乙烯醇纤维的掺量增大而显著降低;钢纤维和聚乙烯醇纤维均能改善超高性能混凝土的弯拉性能;超高性能钢-聚乙烯醇混杂纤维混凝土对超高性能钢纤维混凝土的折压比和拉压比的增益比随着钢纤维掺量的提高而增加,钢纤维与聚乙烯醇纤维在改善超高性能混凝土弯拉性能上具有良好的协同效应。

英文摘要：

It discussed the influence of fiber type and dosage on workability and bending properties of fiber reinforced ultra high per- formance concrete by means of concrete slump and mechanical properties. Further investigations of hybrid effect of steel fiber and poly- vinyl alcohol fiber on mechanical parameters, such as compressive strength, flexural and compression ratio and tension and compression ratio, were carried out. The results show that the workability of fiber reinforced ultra high performance concrete decreased with fiber dos- age. Comprehensive strength of fiber reinforced ultra high performance concrete changed slightly with the increase of steel fiber volume fraction, meanwhile, significantly reduced with the increase of polyvinyl alcohol fiber. Steel fiber and polyvinyl alcohol fiber efficiently improved bending properties of ultra high performance concrete. Gain ratio, steel - polyvinyl alcohol fiber hybrid reinforced to steel fiber reinforced ultra high performance concrete, of flexural and compression ratio, tension and compression ratio increased with steel fiber dosage. Steel fiber and polyvinyl alcohol fiber had good synergistic effect in improving bending of ultra high performance concrete.