热物理性质对多孔水泥混凝土温度的作用分析

Analysis on Effect of Thermophysical Properties on Temperature of Porous Cement Concrete

多孔水泥混凝土粗糙的表面、联通的孔隙使其热物理性质与普通水泥混凝土存在显著差异。为掌握热物理性质对多孔水泥混凝土温度变化的作用规律,对其进行温度监测试验并根据试验结果进行无量纲化计算分析。结果表明:反射率对多孔水泥混凝土路面表面最高温度的降低有最大的积极作用。辐射率对多孔水泥混凝土路面表面最低温度的降低有最大的积极作用。辐射率对多孔水泥混凝土路面内部最高温度和最低温度的下降影响最大。相同条件下,增大多孔水泥混凝土路面的反射率和辐射率,可降低其表面和内部的温度。

Thermophysical properties of porous cement concrete is different from that of Portland cement concrete significantly because of its rough surface and connected pores.In order to grasp the effect law of thermophysical properties ontemperature variation of porous cement concrete,its temperature monitoring test is carried out and the dimensionless calculation and analysis are carried out according to the test results.The analysis shows that albedo has the greatest positive effect on the reduction of the maximum temperature of the porous cement concrete pavement surface.The emissivity has the greatest positive effect on the reduction of the minimum temperature of porous cement concrete pavement surface.The emissivity has the greatest effect on the decrease of the maximum and minimum temperatures inside the porous cement concrete pavement.Under the same conditions,increasing the albedo and emissivity of porous cement concrete pavement can reduce its surface and internal temperatures.