体积含量对织物/水泥复合材料弯曲性能的影响

Effect of volume fraction on the flexural property of fabric reinforced cement matrix composites

采用无碱玻璃纤维机织物,制备了不同体积含量的织物增强水泥基复合材料,通过三点弯曲抗折强度试验和断裂面形貌数码照片分析,研究了织物体积含量对机织物增强水泥基复合材料弯曲性能的影响。研究结果表明,玻璃纤维机织物体积含量从1%上升到5%时,织物增强水泥复合材料全载荷挠度曲线的形状和弹性模量没有明显变化,经向抗折强度从8.5 MPa上升到17.8 MPa,纬向抗折强度从8.1 MPa上升到17.2 MPa,但增加的幅度与聚合物基单向复合材料纵向强度的混合定律不相符,断裂能从0.53 kJ/m2上升到1.89 kJ/m2,且增加的幅度明显增大。

Fabric reinforced cement matrix composites with different volume fractions were prepared with the alkali-free glass fiber woven fabric.Three point bending test and analysis of digital photograph of sectional contour were used to study the effect of the volume fraction of the fabric on the flexural property of woven fabric reinforced cement matrix composites.The results show that as the volume fraction of woven fabric increases from 1% to 5%,there is no obvious change in the load-deflection curves and elastic modulus of the glass fiber woven fabric reinforced cement matrix composites,and the flexural strength in the warp increases from 8.5 MPa to 17.8 MPa,and in the weft,from 8.1 MPa to 17.2 MPa,but the increment disagrees with the mix law of the fiber reinforced polymer matrix composites.The breaking energy increases from 0.53 kJ/m2to 1.89 kJ/m2 and a greater margin of increase is observed.