Theoretical Analysis And Experimental Study Of Stress Absorbing Layer To Prevent Reflection Crack In Half Rigid Pavement

This paper mainly through the pavement structure mechanics analysis to explorestress-absorbing layer beneath the bottom layer of the asphalt laying stress state influence,and to analyze the thickness of the stress absorbing layer itself, modulus, adhesionconditions change on the bottom layer of the stress state impact, as a reference, stressabsorbing layer materials design, test evaluation; Finally roundtrip load test on asphaltfatigue cracking comprehensive comparison. Investigate the stress absorbing layersemi-rigid pavement reflection cracking in the preventio n and treatment of positivesignificance.1, through the analysis of three-dimensional element model with Ansys software tosimulate the force status of asphalt pavement on the different stress-absorbing layermodulus, thickness and analysis of working conditions in the international community forthe first time found to be effective stress-absorbing layer should have a certain thicknessand a certain modulus and reasonable thickness of1.5to3cm, reasonable modulus of500to800MPa.2, with a variety of asphalt stress absorbing layer schemes are strain-controlled fatiguetests with reciprocating wheel load test, the test results show that the high amount ofasphalt rubber asphalt as a semi-rigid base stress absorbing layer can effectively preventreflection cracks.3, the proposed semi-rigid pavement reflective cracking prevention technologyprograms, the use of a certain thickness and modulus, high amount of asphalt rubberasphalt as a stress-absorbing layer delaying initial cracks appear, the last in the appropriateuse of asphalt pavement fatigue performance of high amount of asphalt rubber asphaltdelaying the development of reflective cracking.