Creep deformation characteristics of modified asphalt and porous asphalt mixture using TPS additive

摘要

Creep deformation characteristics of Tafpack Super (TPS) modified asphalt binders and porous asphalt mixtures were investigated in this paper. Dynamic Shear Rheometer (DSR) was chosen to conduct the shear creep test at 20□ over a wide range of shear stress to determine the relation between shear creep rate, modulus and TPS modifier percents. Unconfined static uniaxial creep tests were carried out to study the relation between compressive creep strain, stiffness modulus and TPS percents in porous asphalt mixture. Test results indicate that the shear creep rate of asphalt binders can be decreased and the shear creep modulus can be increased by the TPS additives. Furthermore, the creep deformation is decreased and the creep stiffness modulus is increased for porous asphalt mixtures containing TPS additives. The difference results from TPS modified asphalt and porous asphalt mixture using TPS additive indicated that the use of TPS as an additive in porous asphalt mixture may decrease the mechanical properties compared with its effect on asphalt as a modifier.