研究了聚合物粗纤维掺量对高性能混凝土抗压、劈裂抗拉、抗弯性能和抗弯破坏特性的影响,提出聚合物粗纤维混凝土抗弯韧性评价指标。研究结果表明,相对于素混凝土,聚合物粗纤维混凝土劈裂抗拉强度、抗弯强度和弯曲初裂挠度有一定的提高,抗压强度、弯曲断裂能明显提高。此外,聚合物粗纤维增韧机理与钢纤维混凝土有较大区别,它能在混凝土破坏后能促使结构挠度减小,具有“修复”作用,可提高结构安全性。 The effect of polymer crude fiber content on compression resistance, splitting tensile strength, flexural strength and bending failure properties of high performance concrete was studied. The evaluation index of flexural toughness of polymer crude fiber reinforced concrete was proposed. The results show that compared with pure concrete, the tensile strength, flexural strength and flexural cracking of polymer crude fiber reinforced concrete increase to a certain extent, and compressive strength and flexural rupture can be obviously improved. In addition, the toughening mechanism of polymer crude fiber is quite different from that of steel fiber reinforced concrete. It can reduce the structural deflection after the concrete is damaged and has the function of “repairing” to improve the structural safety.