摘要
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%。
The influences of the modified polypropylene （PP） fiber and the hybrid ratio and hybrid effect of PP fiber and aramid fiber on the mechanical properties of cementbased composites were investigated. The physical models of the interface layer of fiber and cement mortar were built in order to describe the fiber reinforced mechanism of the cement mortar. The experiments show that the modified PP fiber improves the earlier flexural strength of cement mortar obviously, and the mixture of PP fiber and aramid fiber increases the later flexural strength of cement mortar significantly. The 3 days and 28 days flexural strength of the cement mortar, which reinforced by the mixture of 0. 56% volume fraction of PP fiber and 0.24% volume fraction of aramid fiber, are increased by 18.48% and 31.17%compared to its ordinary cement mortar, respectively, and its 3 days and 28 days compressive strength are increased by 7.16 % and 5.19 %, respectively.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2014年第1期140-145,共6页
Acta Materiae Compositae Sinica
基金
济南铁路局基金计划项目(G08013)
关键词
聚丙烯纤维
混杂纤维
力学性能
水泥砂浆
增强机制
polypropylene fiber
hybrid fiber mechanical properties
cement mortar
reinforced mechanism
