Abstract
Ari analysis of rutting depth on expressways was conducted and it was made dear that the Dynamic Stability (DS) of moru than 800 should be a target value to plastic flow rutting on expressways with daily heavy traffic volume of less than 5000 vehides in one direction and the DS of more than 2000 to restrain plastic flow rutting on expressways with daily heavy traffic volume ofless than or equal to 5000 vehides. Tests to determine the property of modified asphalt cements was conducted with the Accelerated Pavement Testing Machine, and fallowing properties were found tobe desired to have enough resistance to the plastic flow rutting-, softening point of60°C, viscosity at 60°C of more 1000pa·Es, though more data are required.
