温度对沥青混合料导热系数的影响及预估模型验证  

Influence of temperature on thermal conductivity of asphalt mixture and validation of prediction model

作　　者：顾海荣[1] 叶敏[1,2] 樊晓旭 欧谊 靳浩伟 袁溪伟 杨文娟 GU Hai-rong;YE Min;FAN Xiao-xu;OU Yi;JIN Hao-wei;YUAN Xi-wei;YANG Wen-juan(National Engineering Research Center of Highway Maintenance Equipment,Chang'an University,Xi'an 710064,Shaanxi,China;China Road and Bridge Engineering Co.Ltd.,Beijing 100011,China;Shangman Branch of Shaanxi Communications Holding Group Co.Ltd.,Shangluo 726400,Shaanxi,China;School of Water Conservancy and Environment,Chang'an University,Xi'an 710054,Shaanxi,China)

机构地区：[1]长安大学公路养护装备国家工程研究中心,陕西西安710064 [2]中国路桥工程有限责任公司,北京100011 [3]陕西交通控股集团有限公司商漫分公司,陕西商洛726400 [4]长安大学水利与环境学院,陕西西安710054

出　　处：《长安大学学报（自然科学版）》2023年第4期12-21,共10页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51408046)。

摘　　要：为提高就地热再生加热过程中沥青路面温度场的计算精度,采用理论分析和试验相结合的方法,对温度影响沥青混合料导热系数的规律、沥青混合料导热系数预估模型及沥青路面传热模型进行研究。研发基于一维稳态传热原理的单防护平板法沥青混合料导热系数测试装置,测试不同温度下集料、沥青胶浆和沥青混合料的导热系数以及沥青形态随温度变化的规律,分析温度影响沥青混合料导热系数的机理,对比不同模型预估沥青混合料导热系数的精度;将沥青混合料导热系数随温度变化的函数引入沥青路面传热模型,对沥青路面传热模型进行优化,并通过模拟加热试验,对优化前后沥青路面传热模型的精度进行对比。研究结果表明:随着温度的升高,沥青逐渐由固态转化为液态,SBS沥青的软化点在50℃附近,导致沥青混合料导热系数在低于50℃时,随温度的升高而增大,在高于50℃时,随温度的升高而减小;Williamson模型、并联模型、串联模型和陈则韶模型中,Williamson模型预估的沥青混合料导热系数与试验结果吻合度最好;考虑沥青混合料导热系数随温度变化规律的沥青路面传热模型更精确,预估的沥青路面加热功率曲线与试验结果重合度好,为沥青路面就地热再生加热过程中加热功率的控制奠定了一定的基础。In order to improve the temperature field calculation accuracy of asphalt pavement in the process of hot in-place recycling heating,the law of temperature influence on the thermal conductivity of asphalt mixture,the thermal conductivity prediction model of asphalt mixture,and the heat transfer model of asphalt pavement were studied by combining theoretical analysis and experiment.A thermal conductivity test device for asphalt mixture with the single shield plate method was developed based on the one-dimensional steady-state heat transfer principle.The thermal conductivity of aggregate,asphalt mortar,and asphalt mixture was tested at different temperatures,the law of asphalt morphology changed with temperature,and the mechanism of temperature influence on the thermal conductivity of the asphalt mixture was analyzed.The accuracy of different prediction models in predicting the thermal conductivity of the asphalt mixture were compared and analyzed.The heat transfer model of asphalt pavement was optimized by introducing the function of thermal conductivity of asphalt mixture with temperature.The calculation accuracy of the asphalt pavement heat transfer models before and after optimization were evaluated by comparing them with the simulation heating test.The results show that the asphalt gradually transforms from solid to liquid with the temperature increasing,and the softening point of SBS asphalt is about 50℃.As a result,the thermal conductivity of the asphalt mixture increases with the temperature rising below 50℃and decreases with the temperature rising above 50℃.Among the Williamson model,parallel model,series model,and Chen Ze-shao model,the thermal conductivity of the asphalt mixture predicted by the Williamson model has best agrees with the experimental results.The heat transfer model of asphalt pavement considering the thermal conductivity of asphalt mixture changes with temperature is more accurate,and the predicted heating power curve of asphalt pavement has a good coincidence with the test results,w

关 键 词：道路工程 沥青混合料 试验 导热系数 温度 预估模型 

分 类 号：U414[交通运输工程—道路与铁道工程]