热管对沥青混合料降温特性及高温稳定性的影响

Influence of Heat Pipe on Cooling Characteristics and High Temperature Stability of Asphalt Mixture

为有效减少沥青路面的高温车辙病害,基于重力热管降温原理,本文成型了埋置热管的沥青混合料车辙试件;通过烘箱模拟了车辙试件的升温和降温过程,利用温度传感器实时监测车辙试件不同位置的温度;分析了埋设热管的沥青混合料车辙试件的焓变和温度梯度,评价了热管对沥青混合料降温特性的影响;同时研究了热管对沥青混合料抗车辙性能的影响。结果表明:热管在一定程度上可以起到调节沥青混合料温度变化的作用,减小了沥青混合料受温度变化的影响;热管的埋设可以显著提高沥青混合料的动稳定度,改善沥青混合料的高温抗车辙能力。

In order to effectively improve the high temperature stability of the asphalt pavement,the asphalt mixture rutting specimens without embedded and with embedded heat pipe were prepared based on the principle of the gravity heat pipe cooling.The heating and cooling processes of the rutting specimens were simulated by an oven.The temperature sensor and temperature gun were used to collect the temperature data at different positions of the rutting specimens in real time.The enthalpy change value and temperature gradient in a specific calculation range was analyzed to study the effect of heat pipe on the cooling characteristics of the asphalt mixture rutting specimens.The influence of the heat pipe on the rutting resistance of the asphalt mixture was studied.The results show that the heat pipe can adjust the temperature change of the asphalt mixture to a certain extent,and reduce the influence of temperature on the asphalt mixture.The heat pipe can enhance the dynamic stability and improve the high-temperature rutting resistance of the asphalt mixture significantly.