Research On Mechanism And Anti-crack Measure Of Reflection Crack Of Composite Pavement

With composite pavements having been built and being put into use, reflection crack has been one of the major modes of distresses in composite pavement during running by the periodically change of temperature and repeated traffic loads. Reflection crack not only influences the road appearance and drive comfort, but also most greatly shortens the service life of road surface.The mechanism and the performance of anti-crack measure of reflection crack of composite pavement are studied。First of all,this paper base on linear elastic fracture mechanics,and take finite element software,and set up two-Dimension model to simulate pavement structure,and analyses the changes of stress intensity factor on the crack tip and structural parameters affect the stress intensity factor in vehicle load and temperature load.Secondly, the paper base on fracture mechanics,and take finite element software,analyses the interlayer influences the stress intensity factor on the crack tip in vehicle load and temperature load.Finally,based on studying on related research achievement both in and abroad, the corresponding design of aspahlt-rubber stress-absorbing layer is carried out, and the performance is comparatively studied. The test results indicate that the rubber asphalt stress-absorbing layer has the high,low temperature and water stability, of which, AR-SMA-5 has the best performance than AR-SMA-5 and SBS-SMA-5, the performance of AR-AC-5 as well as SBS-SMA-5.