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Test study of varieties and spread quantities for binding layer in asphalt pavement

ZHA Xu-dong,CHEN Wei(College of Highway Engineering,Changsha University of Science and Technology,Changsha 410076,China)  
Because the semi-rigid asphalt pavements for highclass highway are easy to produce the questions,such as early damage,reflected crack,water damage,rut and so on,through the large-scale direct shearing test and the permeating test with the indoor combined specimen are carried out,constructing the trial road and the drawing test in the field are constructed,we perform a test study of varieties and spread quantities for the binding layer with modified asphalt(SBS modified asphalt,rubber-powder modified asphalt and resin modified asphalt in the trial road).The results show that there is a parabolic correlation with single peak between the shear strengths and the spread quantities for the binding layer of the rubber-powder modified asphalt and the resin modified asphalt,and the optimum spread quantities are determined.Meanwhile,the binding layer of modified asphalt has better crack-resistance,waterproof and binding performances than the slurry-sealed coat and other ordinary treating methods.Compared with other methods,the effect of rubber-powder modified asphalt is optimum,and it is a kind of environmetally friendly material.Therefore,it will obviously improve the pavement performances to use the modified asphalt as the binding layer for the high-class highway asphalt pavements or the waterproof binding layer for the asphalt deck pavements in bridges.
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