Abstract:In order to solve the problems of debonding and water loss between base course and surface course, the high temperature stability and water stability of super-viscous and shear resistant emulsified asphalt (SEA) slurry mixture were studied by self-designed pull-out test and shear test, and the modification mechanism of SEA was analyzed by molecular dynamics. The results show that the high temperature sensitivity of SEA slurry seal mixture is low. Compared with the matrix emulsified asphalt, the tensile strength and shear strength of SEA slurry seal mixture at 60 ℃ are increased by 156.81% and 88.17%, respectively. Compared with the matrix emulsified asphalt slurry mixture and the SBS modified emulsified asphalt slurry mixture, the interlaminar tensile and shear strength of the SEA slurry mixture basically loses after dry-wet cycle still has about 60% of that under dry conditions, which greatly improves the water stability of the slurry seal.The isocyanate groups of PU molecules in SEA react with the hydroxyl groups in asphalt, which makes the polar components in asphalt gather more closely because of its own chain structure, thus increasing the cohesiveness of asphalt micelle. When the slurry mixture is eroded by water, the SBR in SEA forms the glue net structure through the self-generated aggregation behavior, so as to achieve the purpose of reducing the invasion of water molecules to the asphalt mortar and improve the water stability of the lower seal coat.