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

Abstract

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. This
is one cause of the urban heat island phenomenon. In the field of road engineering, cool pavements have been
constructed to decrease the surface temperature and to improve the road environment. We have previously
studied the cement-based grouting material containing cement, ceramic waste powder, and natural zeolite for
cool pavements. This cool material is poured into voids in porous asphalt pavements. The construction
method for this cool pavement is the same as that for water retaining pavements. The temperature
measurements show that the surface temperature was lower by 15-20°C than the conventional porous asphalt
pavement temperature of 60°C. On the other hand, the accumulation of permanent strain in the asphalt
pavements causes rutting under passing traffic loads in the hot summer season. In this study, the fatigue tests
under a fixed-point load were conducted to evaluate the fatigue resistance of the surface temperature
reducing pavement at 40°C. The fatigue resistance of pavements under various loading levels is evaluated at
sinking displacements of 15 and 20 mm. The test results show that the surface temperature reducing
pavement has a higher fatigue resistance than conventional porous asphalt pavements.