Abstract:The relationship between the rutting life of asphalt pavement and its average temperature, temperature gradient were analyzed. The distribution of compression stresses for asphalt surface layer was discussed. Based on the pavement temperature field data collected at 90 areas in China over the years, the corresponding rutting equivalent temperatures were calculated and analyzed, the correlation between the standard rutting equivalent temperature and annual average temperature and difference of the highest and lowest monthly average temperature were summarized. Hence, the standard rutting equivalent temperatures for asphalt pavement at 738 areas in China were calculated, for design purpose, a contour map of the standard rutting equivalent temperatures was initially proposed. Moreover, the influences of various factors in the non standard conditions on the rutting equivalent temperature for asphalt pavement were analyzed, and a set of approximate formulas were given accordingly. At last, through a comparative study, the reliability of the calculation method and corresponding results were validated.

Abstract:The relations between the fatigue life of a asphalt pavement and its average temperature, temperature gradient were discussed, based on the equivalency principal of cumulative fatigue damage, a method for calculating the fatigue equivalent temperature for asphalt pavement was put forward, with reference to the pavement temperature field data collected at 95 areas in China over the years, the corresponding fatigue equivalent temperatures were calculated and analyzed, the correlation between the standard fatigue equivalent temperature and the altitude of asphalt pavement located, the characteristic asphalt pavement temperature (pavement surface average temperature over years and its standard deviation ) were summarized. Hence, the standard fatigue equivalent temperatures for asphalt pavement at 738 areas in China were calculated, for design purpose, a contour map of the standard fatigue equivalent temperatures was initially proposed. Moreover, the influences of various factors in the non-standard conditions on the fatigue equivalent temperature for asphalt pavement were analyzed, and a set of approximate formulas were given accordingly. At last, through comparative study, the reliability of the calculation method and corresponding results were validated.

Abstract:Based on subgrade compression strain index and the equivalency principal of cumulative fatigue damage, conception and calculation method of equivalent temperature for asphalt surface layer were put forward. The relationship between the temperature condition of asphalt surface layer and subgrade fatigue life was analyzed. The law of equivalent temperature for asphalt surface layer was summarized. By introducing modified coefficient to subgrade fatigue life, regression formula among modified coefficient , the altitude of asphalt pavement located, pavement surface average temperature and its standard deviation over the years was established. Accordingly, modified coefficients at 738 areas in China were calculated and a contour map of was draw. Then simple and practical regression formula between modified coefficient and two common meteorological parameters: annual average temperature and difference of the highest and lowest monthly average temperature was established. Finally, the influence rules of various factors on modified coefficient to subgrade fatigue life were summarized and approximate modified formula was given.