Semi-rigid Asphalt Pavement Seal Coat

Semi-rigid base has become a primary pavement structure because of high intensity, distortion resistances and heavy traffic adaptability. But it has disadvantages. So study on bituminous surface treatment to prevent reflection crack is very important.This paper systematically studied prime coat, seal coat and earthwork cloth, based on many theories and experiments. The key of prime coat is penetration. The key of seal coat is binding. This paper studied penetration of asphalt emulsion and asphalt diluted by paraffin and infection of preservation; presented optimal prime coat material and dosage, and determined optimal dosage of SBS modified asphalt and base asphalt as seal coat binder sprayed on cement stabilized gravel. This paper also analysed influence of different material combination on shear intensity between base and surface. The shear intensity of earthwork cloth is also researched through analysis on different cloth, temperature and treatment on gravel. The research can solve some problems of surface treatment and seal coat, and provide reference for pavement construction.