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

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 100mm×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.