聚丙烯纤维水泥稳定碎石断裂性能试验研究

EXPERIMENTAL STUDY ON FRACTURE PROPERTY OF CEMENT STABILIZED MACADAM REINFORCED WITH POLYPROPYLENE FIBER

通过30个尺寸为100mm×100mm×515mm的聚丙烯纤维水泥稳定碎石和普通水泥稳定碎石三点弯曲试件断裂试验,探讨了聚丙烯纤维对水泥稳定碎石断裂韧度(KIC)、断裂能(GF)、临界裂缝嘴张开位移(CMODC)、临界裂缝尖端张开位移(CTODC)、极限裂缝嘴张开位移(CMODmax)和极限裂缝尖端张开位移(CTODmax)的影响。试验结果表明:聚丙烯纤维的掺入可增大水泥稳定碎石的断裂韧度、断裂能、临界裂缝嘴张开位移、极限裂缝嘴张开位移、临界裂缝尖端张开位移和极限裂缝尖端张开位移;随着聚丙烯纤维体积掺量的增加,断裂韧度、临界裂缝嘴张开位移和临界裂缝尖端位移的变化无明显规律,但断裂能、极限裂缝嘴张开位移和极限裂缝尖端位移基本上呈线性增加的。

By the three-point bending test on the 30 specimens of common cement stabilized macadam and cement stabilized macadam reinforced with polypropylene fiber of size 100min×100mm×515mm, the impacts of polypropylene fiber upon the fracture properties of cement stabilized macadam were studied, such as fracture toughness （Kic）, fracture energy （GF）, critical crack mouth opening displacement （CMODc）, critical crack tip opening displacement （CTODc）, ultimate crack mouth opening displacement （CMODmax）, and ultimate crack tip opening displacement （CTODmax）. The test results indicate that the addition of polypropylene fiber can increase the fracture toughness, fracture energy, critical crack mouth opening displacement, critical crack tip opening displacement, ultimate crack mouth opening displacement and ultimate crack tip opening displacement of cement stabilized macadam. As the increase of polypropylene fiber volume ratio, the varying of fracture toughness, critical crack mouth opening displacement and critical crack tip opening displacement has no disciplinarian. However, fracture energy, ultimate crack mouth opening displacement and ultimate crack tip opening displacement are increasing in linearity.