Rubber asphalt has a good elastic recovery capability、adhesion and low temperature anti-cracking performance, so using the rubber asphalt as binder of the LSPM, it is to design Permeable Stress-absorbing Layer(PSAL) to further enhance the absorptive capacity of the LSPM.

The influence on asphalt overlay bottom layer tension stress and difference of bending and settlement at joints caused by different stress absorb layers is analyzed with finite element method(FEM),and the reasonable thickness and modulus of stress absorb layer are defined.

The material of stress absorb layers has the superiority in delaying or restraining the reflection cracks of the old concrete road surface, and this is different from general intermediate layer of prevent fracturing .

Prevention of reflective cracks with high viscous asphalt stress absorbing layer;

The application of stress absorbing layer in overlaying old cement concrete pavement;

Through asphalt ductility test and mixture tensile properties and tension-compression fatigue test, the tensile properties and tension-compression fatigue performances of three stress absorbing layer mixtures are analyzed.

Road performance of stress absorbing layers in asphalt mixture;

This paper carries out the bending beam and creep deformation tests under low temperature for the different aggregate grading materials in stress absorbing layers with inventive Sampave asphalt and the other two modified asphalts and then analyzes the influences of asphalt binder and aggregate grading on low temperature anti-cracking performances.

The finite element methods are used to carry out comparative analysis for overlay structures with or without stress-absorbing layer,load stress,thermal stress and stress intensity factors drop by big percentages while stress-absorbing layer is installed between old cement concrete pavement and asphalt concrete overlay,and the effect is more obvious with the lower m.

The causes of reflection crack occurred in semi-rigid base and concrete base are analyzed,the construc- tion technique of rubber asphalt stress-absorbing layer is adopted and its mechanism is discussed,the construction technique and considerations are given at last.

In order to study the crack-proof problem of asphalt overlay of existing cement pavement,the SBS modified asphalt mix is applied as interlayer stress-absorbing layer,and the proportion design,immersion Mar- shall test,freeze-thaw split test as well as the pavement of test road are carried out.