Mechanical Properties and Pavement Usability of Modified Asphalt-Based Joint Material of Cement Concrete Pavement

摘要

The virgin-asphalt-based joint materials of cement concrete pavement are subjected to damages because of repeated vehicle load and environmental factors. The styrene-butadienestyrene (SBS), shape memory polyurethane (PU), and organosilicon (OS) modified asphaltbased joint materials were prepared to improve mechanical properties and pavement usability of virgin-asphalt-based joint materials of cement concrete pavement. The tensile, compressive, shear property, low-temperature ductility, high-temperature fluidity, and elastic recovery performance were tested to select a suitable modifier and confirm its dosage for preparing modified asphalt-based joint material. Results indicate that mechanical properties, ductility, fluidity, and elastic recovery of asphalt joint materials are improved by SBS, PU, and OS modifiers. Especially, the modification effect of PU modifier at the dosage of 8 wt is most satisfactory, successively followed by OS and SBS. The PU at the dosage of 8 is proposed to develop a new modified asphalt-based joint material, reducing the failures of joint material and improving the durability of cement concrete pavement.