TEMPERATURE GRADIENT IN A FULL DEPTH ASPHALT AND ITS EFFECT ON MODULUS AND SHEAR GRADIENTS

The modulus of an asphalt bound layer is temperature dependent. At low temperatures, the modulus value is larger than its value at high temperatures. Pavement temperature may be neither constant nor linear with pavement depth and hence its modulus value may be neither constant nor linear with pavement depth. Information regarding temperature gradient along the asphalt bound layer becomes valuable when the daily, monthly and seasonal variations in temperature gradient are with such magnitude that the modulus gradient is largely affected. This paper provides information related to changes in temperature gradient, in a 12 inch (30 cm) full depth asphalt, caused by variations in air temperatures. Resulting changes in pavement modulus gradient, represented by the diametral resilient modulus, and shear stress gradient are investigated. (A) For the covering abstract of the conference see IRRD 873950.