The Research Of Bong Technology Based On High Permeability Emulsified Asphalt

The semi-rigid base asphalt concrete pavement is widely used in China. Semi-rigid base pavement is constituted by asphalt concrete surface layer, semi-rigid base layer and subbase layer. There is a big difference between the modulus of semi-rigid base layer and asphalt concrete surface layer, and the deformation compatibility may be very poor. If there is not good bonding effect between surface and base layers, the interface between these two layers may be very weak, and the pavement cannot bear the huge horizontal shear stress. The fracture of slippage, shoving and upheaval may occurred at the interface. Therefore, a good performance asphalt binder should be introduced into the semi-rigid base pavement to improve the bonding effect between surface and base layers.This paper based on plenty of researches all over the world, and make a research on the road performance of high penetration emulsified asphalt.First, a penetration test was utilized to obtain the relationship between penetration effect and spread quantity of high penetration emulsified asphalt. Then many other bonding materials which utilized widely in actual engineering were compared to the high penetration emulsified asphalt. The effect of semi-rigid base layer conditioning period, high penetration emulsified asphalt spread temperature and conditioning temperature to the penetration effect were also analyzed.Furthermore, the shear strength test between surface and base layers were utilized to obtain the optimal content of high penetration emulsified asphalt. By the way, the orthogonality analysis method was utilized to analyzed the shear strength influence factors. The results indicated that the interface binder type and the spread quantity had big influence the shear strength.Finally, the three-dimensional finite element model of semi-rigid asphalt concrete pavement was built in commercial finite element software ABAQUS based on the actual pavement structure. And the mechanical responses of pavement structure were simulated and calculated. The effects of overloading, horizontal loading, surface layer thickness, surface layer modulus, base layer modulus and the interlayers contact to the shear stress at the interlayer between surface and base layers were analyzed. The results indicated that the shear stress in the bonding layer was mainly effected by vehicle overloading and horizontal loading. Besides, the shear stress was not very sensitive to the pavement structure geometric and material parameters. By comparing the FEM calculation results and the material test results, the high penetration emulstified asphalt was proved to meet the requirement of the shear stress between layers, it can make the pavement structures to be continuous.All the research above can provide the reference and foundation to the widely application of high penetration emulsified asphalt binder.