多聚磷酸复合SBS改性沥青的黏附特性OA北大核心CSTPCD

An investigation of the modification mechanism and adhesion performance is explored for polyphosphoric acid (PPA) composite SBS modified asphalt(PPA/SBS).To clarify the influence of the base asphalt oil source and PPA on the adhesion of PPA/SBS,different oil source base asphalt and different concentrations of PPA,adding phthalic acid polyphosphoric acid composite SBS modified asphalt was prepared from butyl ester.The influence of the type of base asphalt,PPA type and content on its conventional road performance was studied.The preparation process of PPA/SBS modified asphalt was determined.Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) revealed the microstructure evolution and modification mechanism of PPA/SBS modified asphalt.The adhesion performance characterization parameters were obtained by AFM to quantitatively characterize the change rule of the adhesion performance of PPA/SBS modified asphalt.The research results show that the PPA/SBS modified asphalt prepared by compounding SK base asphalt and 115％ PPA has the best performance when the PPA content is 0.5％.To overcome the negative effect of PPA on the low temperature performance of PPA/SBS modified asphalt,plasticizers can be added during the preparation process.New characteristic functional groups appear in the process of compounding PPA and SBS to prepare PPA/SBS modified asphalt,which belongs to chemical modification.PPA can effectively improve the high temperature stability and water resistance of SBS modified asphalt,and low temperature performance is basically equivalent to SBS modified asphalt.