| The miles of highway is increasing rapidly with the national economic development. Howerer, vavrious types of diseases inevitably occure in asphalt pavement during its service time, and rutting is the major type of all pavement diseases. Floating rutting, the most common kind of rutting, mainly occures in the mid-layer of asphalt course and is difficult to rehabilitate currently. Considering the most important factor that causes floating rutting, the author measured the temperature of both porous alphalt pavement (OGFC) and SMA pavement to find a new approach to reduce rutting in asphalt pavement.By comparing the consecutive temperature data mesarued on the test roads, including Wuzhou Road and Binzhou Road in Pudong district of Shanghai, it indicates that the mid-layer temperature of OGFC is always lower than that of SMA especially in the high temperature environment, and the largest difference reached 2.5℃during the tests.The void ratio determining the draining efficiency would decrease gradually as the OGFC pavement starts its service, therefore, it is necessary to establish the relationship between the void ratio of OGFC and the scale of temperature reduction. A large number of rutting board tests are impletmented to simulate the scale of temperature reduction due to different void ratios of OGFC. The results show that the scale of temperature reduction decreases with the void ratio drops, and the phenomenon of temperature reduction almost vanishes when the void ratio of OGFC drops to 8%.Finally, by analyzing the temperature data obtained from in-situ measurement and indoor simulation tests, the relation between the void ratio of OGFC and the scale of temperature reduction is estabished using multi-linearity regression method.
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