基于温差评价方法的沥青混合料渗水系数试验与数值模拟

发布时间：2018-11-06 17:22

【摘要】：为了快速检测密级配沥青混合料渗水系数,提出一种采用路面表面温差评价路面渗水系数的新方法。对沥青混合料空隙率与渗水系数的关系进行了分析;通过室内试验研究了不同渗水系数的沥青混合料试件在相同照射条件下的失水质量、失水率和表面温差;通过数值模拟计算了饱水后沥青路面表面温度随太阳辐射的变化规律;分析了季节对表面温差的影响,并将数值模拟结果与室内试验结果进行了对比分析。结果表明:饱水后的试件通过室内模拟太阳辐射照射一段时间后,随着渗水程度的增加表面温差逐渐增大,最大温差值达5.7℃;太阳辐射强度与路面表面温差直接相关,最佳评价时段为9:00~14:00;夏季路面表面温差最大,亦为最佳评价渗水系数季节。
[Abstract]:In order to quickly detect the permeability coefficient of dense gradation asphalt mixture, a new method for evaluating the permeability coefficient of pavement surface temperature difference is proposed. The relationship between void ratio and permeability coefficient of asphalt mixture is analyzed, and the water loss quality, water loss rate and surface temperature difference of asphalt mixture specimens with different water permeability coefficients under the same irradiation conditions are studied through laboratory tests. The variation law of surface temperature with solar radiation after saturated asphalt pavement is calculated by numerical simulation, the influence of season on surface temperature difference is analyzed, and the results of numerical simulation and indoor test are compared and analyzed. The results show that the surface temperature difference increases gradually with the increase of water permeation degree, and the maximum temperature difference reaches 5.7 鈩，

本文编号：2314955