Study on cohesion and adhesion of high-viscosity modified asphalt

High-viscosity modified asphalt (T-HVA) specifically used for drainage/permeable asphalt pavement was prepared by composite modification of matrix asphalt using a thermoplastic elastomer (TPE) and SBS particles. The performance of the high-viscosity modified asphalt (T-HVA) was characterized by conventional tests, and compared with the performance of 70# asphalt, SBS modified asphalt and engineering high-viscosity asphalt. The results show that all the indicators of the modified asphalt are better than that of the matrix asphalt, and the dynamic viscosity of the T-HVA is greater than one million Pa.s, which is much higher than that of the engineering high-viscosity asphalt and SBS modified asphalt. The segregation test shows that the compatibility and stability of T-HVA asphalt are better than others. Cohesion test shows that the cohesion of the modified asphalt is obviously better than that of the matrix asphalt at different temperatures, and the higher the temperature, the better the cohesion, and the cohesion of the T-HVA before and after aging is relatively stable. The result of the peeling rate measured by ultraviolet spectrophotometry shows that: the peeling rate of the T-HVA is the smallest, i.e., the adhesion is the best, and is consistent with the dynamic viscosity, i.e., the greater the dynamic viscosity, the better the adhesion. Based on the comprehensive analysis of various indicators. The results of Performance Grade (PG) grading test show that T-HVA has good high and low temperature performance. The modified materials with good dispersion in asphalt and the TPE particles as high elastic interlocking units are uniformly distributed in the network structure; The T-HVA has relatively strong aggregate adhesion and cohesiveness, exhibits good high temperature stability and low temperature flexibility, and is suitable for drainage/permeable asphalt pavement. Keywords: Pavement engineering, High-viscosity modified asphalt, Cohesion and adhesion, Permeable asphalt pavement