The Study On The Mechanical Property For Fibrous High Viscoelastic Asphalt Sand

The pavement performance requirement is higher and higher with the gradual increase of traffic volume.At present there are mainly three methods to improve the performance of asphalt mixture:Improving the proportion of mixture,to enhance road use performance of asphalt mixture.To improving the quality of the asphalt,to strengthen the technical specifications of the asphalt.By adding the fiber and rubber in the asphalt mixture to improve the mechanical properties of asphalt mixture.Because of the advantages of high modulus,high temperature resistant,light texture the fiber is widely used in road engineering.Studies have shown that fiber can improve asphalt mixture performance and the service life of the road.Most researches at present are fiber strengthen for the ordinary asphalt mixture,on fibrous high viscoelastic asphalt sand are rare.This article mainly from the following several aspects to study the mechanical properties of fibrous high viscoelastic asphalt sand.Laboratory test :using the trabecular three-point bending test to study the effect of different temperature and different loading rates on fibrous high viscoelastic asphalt sand;In order to study the viscoelasticity for the fibrous high viscoelastic asphalt sand.Two kinds of fiber which are lignin fiber,basalt fiber are selected to put into the high viscoelastic asphalt for the trabecular bending creep test.And analyz and compare the creep deflection curve and the stiffness modulus.Relaxation modulus master curve is obtained by using the theory of temperature-time equivalence.The generalized Maxwell model parameters in the form of prony series is calibrated by fitting the relaxation modulus master curve with origin8 software.Three kinds of specimen which are lignin fiber,basalt fiber and non-fiber are selected for the direct tensile test.The maximum failure load is used to analyze the tensile strength and the area surrounded by the load and displacement curve is used to analyze the fracture energy.The numerical simulation aspect:Through the creep test of basalt fiber high viscous tar sand to get the fitting parameters of viscoelastic.Using abaqus software to simulate semicircle specimen from the aspects of structure.