玄武岩织物增强水泥基复合材料拉伸力学性能

Tensile Mechanical Properties of Basalt Fabric Reinforced Cementitious Matrix Composite

利用美特斯(MTS)万能试验机研究了掺入不同体积掺量(0、0.5%、1.0%、1.5%)短切碳纤维、玻璃纤维、钢纤维的2层和3层玄武岩纤维织物增强水泥基复合材料的拉伸力学性能.结果表明:短切碳纤维、玻璃纤维、钢纤维均可明显增加玄武岩纤维织物增强水泥基复合材料的开裂强度,并且存在最优体积掺量;在0~1.5%掺量范围内、2层织物时,开裂强度随着3种短纤维掺量的增加而增加,掺量1.5%时最大;3层织物时,开裂强度随着碳纤维、钢纤维掺量的增加先增加后减小,掺量1.0%时达到最大值,而随着玻璃纤维掺量的增加持续增加,掺量1.5%时最大.短切碳纤维、玻璃纤维不能增加其峰值荷载,而钢纤维则明显提高其峰值荷载,2层织物时最优掺量为1.5%,3层织物时最优掺量为0.5%.

Tensile mechanical properties of two and three layers basalt fabric reinforced cementitious matrix composite(BFRCM)with different volume fractions(0,0.5%,1.0%and 1.5%)short carbon,alkali-resistant glass and steel fiber,were tested utilizing a MTS loads frame.The experimental results show that an obvious increase in crack stress is observed in all case when short carbon,glass,steel fibers had been added,and volume fraction exists an optimal value.Within the range of 0~1.5%content,the crack stress increases,reaching a maximum at 1.5%,with increasing volume fraction for 2 layers BFRCM.For 3 layers BFRCM with short carbon or steel fibers,the crack stress firstly increases and then decreases with increasing volume fraction,but the crack stress increases,peaking at 1.5%,with increasing volume fraction for 3 layers BFRCM with short glass fibers.Short carbon and glass fibers cannot increase load-bearing capacity of BFRCM,but a pronounced increase in load-bearing capacity is observed with short steel fibers,reaching a maximum at 1.5%for 2 layers BFRCM and 0.5%for 3 layers.