沥青混合料抗压模量温度修正系数研究

Temperature Modification Coefficient of Compressive Modulus of Asphalt Mixture

大量的试验数据表明,某一温度下沥青混合料的抗压模量同基准温度(20℃)下抗压模量的比值(温度修正系数)与温度之间呈线性比例关系.通过收集我国194个气象观测站点50年的日平均气温资料,根据壳牌沥青路面设计方法,考虑不同地区日气温变化情况和沥青粘滞度性质,采用克里金插值法绘制出全国年有效温度分布图;同时考虑路面温度随深度方向上的变化,绘制出全国沥青混合料温度修正系数分布图,以该系数修正不同地区抗压模量的取值.

Plentiful experimental data show that the temperature modification coefficient, the ratio of the compressive modulus of asphalt mixture on certain temperature to the one on normal temperature （20℃）, is in a linear proportion to temperature,and the coefficient is impervious to asphalt grade and mixture gradation. Based on 50 years＇ mean daily air temperature data collected from 194 state weather observation stations and the SHELL asphalt pavement design technique, an effective mean annual air temperature distribution chart is elicited with t（riging interpolation method by taking daily air temperature change and the asphalt viscosity quality into consideration. With the consideration of the temperature＇s changing with the pavement depth, the distribution chart of the temperature modification cofficient is obtained. The coefficient is used to modify the value of compressive modulus of different regions.