FATIGUE AND AGGREGATE FRETTING RESISTANCE OF SURFACE-TEMPERATURE REDUCING PAVEMENT

In the field of road engineering, cool pavements are used to decrease the surface temperature and improve the road environment. A surface-temperature reducing pavement was previously developed using a cement-based grouting material containing cement, ceramic waste powder, and natural zeolite. From the temperature measurements, it was revealed that the surface temperature was lower by 15-20°C than the porous asphalt pavement at 60°C. The pavements can undergo rutting under passing traffic loads and aggregate fretting in the hot summer season, lowering serviceability and traffic safety. Fatigue tests under a fixed-point load were conducted to evaluate the fatigue resistance of the surface-temperature reducing pavement at 40°C imitating the hot summer season. In this study, fatigue tests under a fixed-point load at 30°C imitating the spring or autumn season were carried out to evaluate the fatigue resistance against the rutting. Furthermore, the aggregate fretting tests were carried out to evaluate the aggregate fretting resistance at temperatures of 50°C and 30°C. The test results showed that the surface-temperature reducing pavement has higher fatigue and aggregate fretting resistance than the porous asphalt pavement.