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试验通过比较重要的热物性指标(毛体积密度、导热系数、比热容),研究在沥青混合料中加入相变材料(PEG2000/SiO_2)后相变沥青混合料与普通沥青混合料之间热物性的差异。结果表明:加入相变材料后提高了沥青混合料比热容,3%与5%相变材料掺量的相变沥青比热峰值分别为1.3和1.15J/(g·K),而基质沥青混合料的比热容随温度改变数值变化较为微小;3%、5%掺量的沥青混合料在40℃时相变沥青混合料开始相变,50℃左右导热系数达到最小约为1.17和1.0 W/(m·K),相变沥青混合料导热系数图呈凹曲线,添加相变材料可以在其相变温度段降低其导热系数,有效提高路面的高温稳定性。
Through the comparison of important thermophysical indexes (gross bulk density, thermal conductivity and specific heat capacity), the thermal properties between phase change asphalt mixture and common asphalt mixture after phase change material (PEG2000 / SiO_2) was added into the asphalt mixture difference. The results show that the specific heat capacity of asphalt mixture increases with the phase change material, and the peak specific heats of phase change of 1.3% and 1.15 J / (g · K), respectively, for 3% and 5% phase change material, The specific heat capacity changes little with the change of temperature. Asphalt mixture with 3% and 5% content changes phase transformation at 40 ℃, the thermal conductivity reaches about 1.17 and 1.0 W / (m · K), the thermal conductivity of phase change asphalt mixture is concave curve, adding phase change material can reduce its thermal conductivity in the phase transition temperature, effectively improve the high temperature stability of pavement.