Study On Temperature Shrinkage Of Semi-rigid Base Asphalt Pavement And The Effect On Temperature Stress

The investigation to the using status of domestic expressways completed shows that: No matter in the south or in the north, the pavement appeares lots of transverse cracks in one year or two years after expressways opened to traffic.The cracking has becomed the main disease of semi-rigid base asphalt pavement,and temperature decrease is the base couse of semi-rigid base asphalt pavement cracking. the primary research object of this paper is the temperature stress status of semi-rigid base asphalt pavement under the action of annual temperature change.This paper analyzes the temperature contractility of pavement material by using Constringency Transmutation Testing Apparatus For Pavement Material. Through a lot of measurements,this instrument can exactly measure the shrinkage deformation of pavement material. This paper test different types of semi-rigid base course material and find out the relation between temperature shrinkage coefficient and temperature.According to the national investigation of climate and pavement typical structure,the writer build a temperature field model of yearly change of air temperature,and make numerical simulation for the temperature field of pavement structure by using ANSYS.This paper analysis the relation between temperature shrinkage coefficient and temperature stress in different areas base on the built temperature field,and advance the anti-cracking index of asphalt pavement in different areas.The writer also analyze the effect of material modulus and structure thickness on temperature stress.These conclusions provide some guidance for the semi-rigid anti-cracking asphalt pavement design.