Study on Preparation of High Viscosity Asphalt and Pavement Performance of Its Mixture
The preparation of high-viscosity asphalt and the road performance of high-viscosity asphalt mixture SMA-13 were studied by using high-viscosity modifier developed by grafting reaction of ethylene-methacrylic acid copolymer,polyketone,low-density polypropylene,PTW resin and additives.The modifi-cation mechanism of high viscosity modifier was revealed by fluorescence microscopy and infrared spectrosco-py.The viscosity,physical properties and storage stability of high viscosity asphalt was evaluated by 60 ℃ dy-namic viscosity,Brookfield viscosity,penetration,softening point and ductility test.The dry high-viscosity mixture was prepared by using different amounts of high-viscosity modifier,and the road performance was compared with that of wet high-viscosity mixture and SBS modified asphalt mixture.The results show that the high viscosity modifier has good compatibility with asphalt.A new absorption peak appeared in the high viscos-ity asphalt,and the modifier had a chemical modification effect on the asphalt.The viscosity and physical properties of high viscosity asphalt increase with the increase of modifier content,and the storage stability of high viscosity asphalt is good.Under the wet and dry process,the high viscosity asphalt mixture prepared by the modifier has better road performance;in the application of dry method,there is an optimum dosage of modifier,which is about 11％of asphalt quality.Under this dosage,the road performance of high viscosity asphalt mixture prepared by dry method is slightly lower than that of wet method.
SMA-13high viscosity modifierwet modification processdry direct casting processpavement performance
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