玄武岩纤维沥青砂浆的抗裂性能研究

Anti-cracking Performance of Asphalt Mortar Reinforced by Basalt Fiber

通过半圆弯拉试验及扫描电镜(SEM)分析,对掺加0%,0.3%玄武岩纤维的沥青砂浆试件进行抗裂性能对比研究.结果表明:掺加适当的玄武岩纤维可增强沥青砂浆的力学性能,无预切口试件破坏时的最大荷载提高了16.2%,临界内聚力提高了14.3%,有预切口试件破坏时的最大荷载提高了51.2%,临界断裂能提高了17.2%;玄武岩纤维的掺加可提高沥青砂浆的黏度,抑制沥青的流动,且沥青对纤维有很好的浸润性,进而增强了两者的黏结力,可在很大程度上降低沥青砂浆的开裂机率.

The anti-cracking performance of the asphalt mortar with 0% and 0.3% basalt fibers was compared through semi-circular bending test and scanning electron microscope(SEM) analysis. The result shows that adding appropriate amount of basalt fibers can enhance the mechanical performance, for the specimens without notch the max load increases by 16.2% and the critical cohesion increases by 14.3% and for the specimens with notch the max load increases by 51.2% and the critical fracture energy increases by 17.2%;Basalt fibers can also raise the viscosity of asphalt mortar, suppress the flowability of the asphalt and it is well compatible with asphalt, so the adhesion is enhanced. This is why basalt fibers can decrease the cracking probability.