Joint sealant performance of cement concrete pavement

The model composed of one viscous and two elastic elements was used to simulate the viscoelastic performances of silicone, polyurethane, rubber asphalt, PVC modified asphalt and polyvinyl chloride mortar, some regressive formulas of the viscoelastic parameter of sealant were provided, the computing approaches of sealant tensile stress arising out of temperature drop and sealant shearing stress caused by vehicle load were established, a limit state equation related to sealant stripping out of joint wall was developed, and the road service performance of experimental sealant was analyzed and evaluated accordingly.It is found that the adhesive failure of sealant mostly arises from the shear stress caused by vehicle load, the primary cause is of sealant stiffness at low temperature under high frequency shearing condition, whereas the tensile stress arising out of temperature drop is subordinate.