研究了化学改性聚丙烯(PP)纤维以及掺加聚丙烯纤维和芳纶纤维混杂比例和混杂效应对水泥基复合材料力学性能的影响,并构建了纤维增强水泥砂浆界面层的物理模型,描述了纤维对水泥砂浆的增强机制.实验表明,聚丙烯纤维经改性后使水泥砂浆前期抗折强度明显提高,聚丙烯纤维和芳纶纤维的混杂使水泥砂浆的后期抗折强度显著提高.改性聚丙烯纤维掺加体积分数为0.56％,芳纶纤维的体积分数为0.24％时,混杂纤维增强水泥砂浆试样较空白试样,3天、28天抗折强度分别提高了18.48％、31.17％,3天、28天抗压强度分别提高了7.16％、5.19％.
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