摘要
基于沥青混合料的热物性参数,研究陶瓷沥青混凝土(CAC)的阻热性能。将陶瓷集料等体积替代SMA-13的粗集料(替代率分别为10%,20%,30%,40%和50%)制备陶瓷沥青混凝土(CAC);测试不同陶瓷掺量的沥青混合料热物性参数(导热系数、热扩散率和比热容);数值模拟不同陶瓷掺量的陶瓷沥青混凝土(CAC)面层对路面结构的隔热效果,并对路面结构层间最高温度与沥青混合料热物性参数进行灰色关联分析。试验结果表明,陶瓷的掺入改变了沥青混合料的热物性参数,当陶瓷掺量为10%时,导热系数和热扩散率分别减少20.5%和23.5%,比热容增加20.9%。陶瓷掺量增加得越多,陶瓷对于沥青混合料热物性参数的改变效果越不明显。有限元结果表明,陶瓷的掺入有效降低沥青路面温度,厚度为4 cm的40%替代率的CAC-13面层底部温度较SMA-13低5.2℃。灰色关联分析表明导热系数、热扩散率和比热容共同影响沥青路面温度,导热系数相对于热扩散率、比热容对路面结构温度影响更大。
Based on thermo-physical parameters of asphalt mixture,the thermal insulating performance of ceramic asphalt concrete（ CAC） is researched. CAC is produced by replacement of the coarse aggregate in SMA-13 with ceramic aggregate by the same volume（ the replacement percentages are 10%,20%,30%,40% and 50%）. Thermo-physical parameters（ thermal conductivity,thermal diffusivity,specific heat capacity） of the mixtures with different ceramic replacement contents are tested,and the thermal insulating effect of the CAC surface with deferent ceramic replacement contents on pavement are simulated. The relationship between the maximum temperature in pavement structure and the thermo-physical parameters is analyzed by grey correlation method. The result demonstrates that（ 1） the addition of ceramic aggregate changes the thermo-physical parameters of the mixture,10% ceramic replacement percentage result in a reduction of thermal conductivity and thermal diffusivity by 20. 5% and 23. 5% respectively and an increase of specific heat capacity by 20. 9%;（ 2） as the increase of the ceramic replacement percentage,the influence of ceramic is decreasing. The FE analysis result shows that compared with 4 cm thickness SMA-13 surface layer,ceramic reduces the temperature in pavement structure effectively,and 40% replacement percentage of CAC-13 could reduce more temperature on the surface bottom by 5. 2 ℃. Grey correlation analysis shows that the 3 thermal parameters jointly influence the pavement temperature, and thermalconductivity has the most significant impact on temperature followed by thermal diffusivity and specific heat capacity.
出处
《公路交通科技》
CAS
CSCD
北大核心
2015年第11期20-26,共7页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51178114)
国家支撑计划项目课题项目(2009BAG15B03)
乌鲁木齐科技局项目(Y131320007)
关键词
道路工程
陶瓷沥青混凝土
瞬态平面热源法
温度场模拟
灰色关联分析
热物性参数
阻热性能
road engineering
ceramic asphalt concrete
transient plane heat source method
temperature field simulation
grey correlation analysis
thermo-physical parameter
thermal insulating performance
