Study On The Asphalt Modification And Its Mechanism

With the rapid development of the highway transportation in our country, the material requirements to the super-highway bitumen pavement has become more and more strict. The common asphalt can't meet the development of the heavy traffic that needs high strength, stability and durability. So it is necessary to research on the modified asphalt with better combination property.Because of the difference on the modifier sorts and asphalt sorts, the property of modified asphalt is different. On the background of researches inside and outside country, firstly the influence of the processing parameters on the property of the modified asphalt has been studied through orthogonal test, and better processing parameters that prepare modified asphalt were obtained. Then the property of the modified asphalt with different SBS contents was studied. The influence factors of thermal storage stability and the content of stabilizer on the thermal storage stability and other property of SBS modified asphalt have been studied, at the same time, the microstructure of modified asphalt was analyzed through fluorescence microscope. The results show that the optimum addition of the stabilizer is 0.45%, while the stabilizer can make some negative influence on the temperature sensitivity of SBS modified asphalt. Based on which the composite asphalt was studied with the addition of EVA. Two kinds of modified asphalts, that is 4%SBS+1%EVA and 3%SBS+2%EVA, were obtained through optimization test, and the composite asphalt with stabilizer was studied systematically. The results show that the composite asphalt has better combination property than SBS modified asphalt, especially the temperature sensitivity. Which were proved truth through DSR and DSC analysis. OMMT and SBS composite asphalt were also studied in this paper and found which can enhance the high-temperature properties and resistance to aging, but further work is needed on it.