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通过对硅藻土改性沥青混合料热传导性能试验研究,得出了不同硅藻土掺量条件下混合料的热传导系数和热容量参数,同时利用有限单元法对冻土地区公路的温度场变化情况进行了研究。室内试验结果表明,硅藻土改性沥青混合料的导热性能比普通沥青混合料有一定程度的降低,其中添加15%硅藻土的沥青混合料热的传导系数比普通沥青混合料降低10%左右,而热容量基本不发生变化。有限元分析结果表明,冻土地基表面温度场随路表温度的波动而发生波动,当采用硅藻土改性沥青时,地基表面温度的最大值比普通沥青混凝土路面有所降低,尤其是当硅藻土添加量达到15%时,地基表面温度比不添加时降低1.5℃。因此硅藻土改性沥青混合料具有良好的阻热性能,对保持冻土稳定性具有一定的效果。
Through the experimental study on the thermal conductivity of diatomite modified asphalt mixture, the thermal conductivity and heat capacity parameters of the mixture under different diatomite content were obtained. At the same time, the finite element method was used to analyze the temperature field changes of the highway in the permafrost region Study. The results of laboratory tests show that the thermal conductivity of diatomite-modified asphalt mixture is lower than that of ordinary asphalt mixture, and the thermal conductivity of asphalt mixture with 15% diatomite is reduced by about 10% compared with ordinary asphalt mixture , While the basic heat capacity does not change. The results of finite element analysis show that the surface temperature field of frozen soil fluctuates with the temperature fluctuation of the road surface. When using diatomite modified asphalt, the maximum surface temperature of the ground is lower than ordinary asphalt concrete pavement, especially when the silicon When the addition amount of algae soil reached 15%, the surface temperature of the ground surface decreased by 1.5 ℃ than that without adding. Therefore, diatomite modified asphalt mixture has good heat resistance, to maintain the stability of frozen soil has a certain effect.