PVA纤维与织物复合增强水泥基材料弯曲韧性研究

Study on Flexural Toughness of PVA Fiber and Textile Reinforced Engineered Cementitious Composite Materials

水泥基复合材料掺入PVA纤维可以提升基体的韧性,定向分布的纤维织物也具有增韧效果。为了研究PVA纤维与织物复合对水泥基材料弯曲性能的影响,通过改变PVA纤维的掺量和织物配网率对方板试件进行抗弯性能试验,采用3种弯曲韧性的能量评价方法对试验结果进行分析和对比。试验结果表明,PVA纤维和织物在基体中产生协同作用;PVA纤维对基体弯曲韧性的贡献要优于织物;PVA纤维掺量和织物配网率的增加可以在一定程度上提高板在开裂过程中能量吸收的能力。

The toughness of the matrix can be increased by adding PVA fiber into engineered cementitious composite, and the directional distribution of fiber textile also has the toughening effect. In order to study the influence of PVA fiber and textile composite on the bending performance of engineered cementitious composite, the bending performance test was carried out by changing the volume content of PVA fiber and textile mesh ratio of the square plate, and the test results were analyzed and compared by using three energy evaluation methods of flexural toughness. The results show that PVA fibers and textile have synergistic effects in the matrix. The contribution of PVA fiber to matrix flexural toughness is better than that of textile. The increase of PVA fiber content and textile mesh ratio can improve the energy absorption capacity of the plate during the cracking process to some extent.