FATIGUE RESISTANCE OF SURFACE TEMPERATURE REDUCING PAVEMENT UNDER FIXED-POINT LOAD

Asphalt and concrete pavements cover a high percentage of urban area. In the summer season,the surface temperature of asphalt pavements exposed to the solar radiation increases to 60°C or more. Thisis one cause of the urban heat island phenomenon. In the field of road engineering, cool pavements have beenconstructed to decrease the surface temperature and to improve the road environment. We have previouslystudied the cement-based grouting material containing cement, ceramic waste powder, and natural zeolite forcool pavements. This cool material is poured into voids in porous asphalt pavements. The constructionmethod for this cool pavement is the same as that for water retaining pavements. The temperaturemeasurements show that the surface temperature was lower by 15-20°C than the conventional porous asphaltpavement temperature of 60°C. On the other hand, the accumulation of permanent strain in the asphaltpavements causes rutting under passing traffic loads in the hot summer season. In this study, the fatigue testsunder a fixed-point load were conducted to evaluate the fatigue resistance of the surface temperaturereducing pavement at 40°C. The fatigue resistance of pavements under various loading levels is evaluated atsinking displacements of 15 and 20 mm. The test results show that the surface temperature reducingpavement has a higher fatigue resistance than conventional porous asphalt pavements.