The optimum thickness confirmation of asphalt mixture stress-absorbing material interlayer

The studying team prepared stress-absorbing material interlayer (SAMI) modified asphalt mixture by the best use of local conditions to test its actual modulus of elasticity, Combining with actual local conditions, Studying team ultimately determine the SAMI practical elastic modulus, which was applied to ANSYS finite element method (FEM) software to calculate the different stress effect of the SAMI thickness, Through analyzing the stress-strain laws with the change of asphalt mixture SAMI thickness under traffic loads, we learned that SAMI eases its own stress a little by increasing its thickness, SAMI thickness change has little effect to the maximum bending deflection values in overlay surface and the bending deflection and the bending deflection difference on both sides of seams. Finally we determine a optimum value of asphalt mixture SAMI thickness for the locally available materials to meet the requirements of anti-cracking for both design and construction at the maximum limit.