相变材料在沥青结构层内掺混方案优化研究  

Optimization of Scheme of Mixing Phase Change Material inAsphalt Structural Layer

作　　者：王世万 解浩杰 于小洋 张亚星 朱玉 WANG Shiwan;XIE Haojie;YU Xiaoyang;ZHANG Yaxing;ZHU Yu(College of Geology Engineering and Geomatics,Chang’an University,Xi’an 710000,China)

机构地区：[1]长安大学地质工程与测绘学院,西安710000

出　　处：《河南科学》2023年第4期552-559,共8页Henan Science

基　　金：国家自然科学基金(41502292,51574037)。

摘　　要：为研究相变材料掺混位置对路基沥青层高温的调控效果,以京新高速伊吾—巴里坤区段整体式路基结构为依托,建立地气耦合计算模型,利用Fluent软件分别计算了未掺混相变材料(方案0)、沥青上面层掺混相变材料(方案1)和整体沥青层掺混相变材料(方案2)三种方案下的路面和沥青层温度,并分析了各方案对路面和沥青层的降温效果.结果表明:①方案2对路面的降温效果优于方案1;②当路面温度为55~65℃时,方案1和方案2对沥青上面层靠近路面3 cm区域的降温效果基本一致,此时选择方案1更符合经济性原则;当路面温度为65~75℃时,方案2对整个沥青层的降温效果明显优于方案1,此时选择方案2更有利于沥青层的降温;③方案2更有利于削减整个沥青层的高温日平均持续时长和沥青下面层的高温天数,但其对沥青上面层高温天数的削减效果与方案1基本相同.综合分析可知,在沥青结构层内掺混相变材料对路面具有较好的降温效果,但其对路面的降温效果与路面的初始温度相关,当路面温度为55~65℃时,采用在沥青上面层掺混相变材料的方案即可达到较好的路面降温效果,当路面温度为65~75℃时,采用在整体沥青层掺混相变材料的方案对路面的降温效果更佳.In order to study the regulation effect of phase change material mixing position on the high temperature of asphalt layer of subgrade,an earth-atmosphere coupling calculation model is established based on the integral subgrade structure of Yiwu-Balikun section of Beijing-Xinjiang Expressway.The Fluent software is used to calculate the temperature of the pavement and asphalt layer under three schemes:unmixed phase change material(scheme 0),mixing phase change material in the upper asphalt layer(scheme 1)and mixing phase change material in the whole asphalt layer(scheme 2),and the cooling effect of each scheme on the pavement and asphalt layer is analyzed.The results show that:①The cooling effect of scheme 2 on pavement is better than that of scheme 1.②When the pavement temperature is between 55℃and 65℃,the cooling effect of scheme 1 and scheme 2 on the region of the 3 cm upper asphalt layer near the pavement is basically the same.In this case,selecting scheme 1 is more in line with the economic principle.When the pavement temperature is between 65℃and 75℃,the cooling effect of scheme 2 on the whole asphalt layer is obviously better than that of scheme 1.In this case,selecting scheme 2 is more conducive to the cooling of asphalt layer.③Scheme 2 is more conducive to reducing the average daily duration of high temperature of the whole asphalt layer and the high temperature days of the lower asphalt layer,but its reduction effect on the high temperature days of the upper asphalt layer is basically the same as that of scheme 1.Comprehensive analysis shows that mixing of phase change material in asphalt structure layer has a good cooling effect on pavement,but its cooling effect on pavement is related to the initial pavement temperature.When the pavement temperature is between 55℃and 65℃,a better cooling effect can be achieved by mixing phase change material in the upper asphalt layer.When the pavement temperature is between 65℃and 75℃,the scheme of mixing phase change material in the whole asphalt

关 键 词：相变材料 沥青结构层 掺混位置 降温性能 地气耦合计算模型 

分 类 号：U416[交通运输工程—道路与铁道工程]