采用高弹模聚乙烯纤维( PE) 和低弹模聚丙烯粗合成纤维( CPP) 混杂技术制备 混杂纤维混凝土，对其抗压和抗弯性能进行测试，并采用双因素方差分析法对弯曲韧性影 响因素的显著性特征进行了分析，同时还对混杂纤维的增强增韧机理进行了探讨． 结果表 明: 在不同的粗集料掺量下，混杂纤维混凝土抗压强度普遍高于素混凝土，其提高幅度主 要集中在 15%～ 30% 之间; 掺入混杂纤维后混凝土试件的荷载 － 挠度曲线整体较为饱满， 多数曲线表现为变形缓慢软化，部分出现变形硬化特征; 纤维掺量对混凝土的韧性有非常 显著的影响，而粗集料掺量影响较小; CPP /PE 纤维可以从不同层次结构对混凝土进行增 韧，产生正混杂效应，从而使制备的混杂纤维混凝土具有优异的韧性．

The hybrid fiber-reinforced concrete was prepared by using the polyethylene fiber ( PE) of a high elastic modulus and the polypropylene synthetic fibers( CPP) of a low elastic modulus，and its flexural behaviors and compressive resistance were determined． Then，the significances of the factors influencing the flexural toughness were discussed through a two-factor variance analysis，and the toughening mechanism of the hybrid fiber was explored． The results show that ( 1) the compressive strength of hybrid fiber-reinforced concrete specimens with different coarse aggregate contents is generally higher than that of plain concrete，and the improvement ranges are mainly between 15% ～ 30% ; ( 2) the load-deflection curves of the concrete specimens with the hybrid fiber are relatively full; and，furthermore，most curves exhibit a slow deformation softening characteristic while some display a deformation hardening characteristic; ( 3) the fiber content has a significant effect on the toughness of the concrete， while the coarse aggregate dosage has a smaller one; and ( 4) the CPP /PE fiber can toughen the concrete from different hierarchies，which causes a positive hybrid effect，thus enabling the prepared hybrid fiber-reinforced concrete to possess excellent toughness．