Thermal Property Evaluation of Porous Asphalt Concrete Based on Heterogeneous Meso-Structure Finite Element Simulation

被引:17
作者
Zhao, Yanjing [1 ,2 ]
Jiang, Jiwang [2 ]
Dai, Yiqing [3 ]
Zhou, Lan [2 ]
Ni, Fujian [2 ]
机构
[1] Nanjing Vocat Inst Transport Technol, Nanjing 211188, Peoples R China
[2] Southeast Univ, Sch Transportat, Nanjing 210096, Peoples R China
[3] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia
来源
APPLIED SCIENCES-BASEL | 2020年 / 10卷 / 05期
基金
中国国家自然科学基金;
关键词
porous asphalt concrete; heterogeneous meso-structure; thermal analysis; X-ray CT scanning; temperature accumulation; MODELING TEMPERATURE DISTRIBUTION; FRACTURE SIMULATION; PERMANENT DEFORMATION; AIR VOIDS; PAVEMENTS; MIXTURE; CONDUCTIVITY; TENSION; IMPACT; ENERGY;
D O I
10.3390/app10051671
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Porous asphalt concrete (PAC) can obviously improve vehicle driving safety on rainy days and reduce environmental noise. It has been widely used in China. The existence of a large number of interconnected voids in PAC makes a significant difference in heat transfer and temperature distribution from conventional dense-graded asphalt concretes (AC). In this paper, the internal structure images of three dense-graded asphalt mixtures and one PAC were obtained by X-ray CT scanning technology, and the internal meso-structure finite element simulation models of asphalt mixtures were established by using the mapped meshing method. The temperature variations of asphalt mixture specimens during laboratory cooling and heating processes were simulated in this study, and laboratory tests were carried out to verify the simulation accuracy. Due to the simulation results, it was found that the thermal characteristics of the PAC mixture were different from those of the dense-graded asphalt mixture due to the large interconnected air void content in the PAC mixture. The temperature field in the PAC mixture was more sensitive to ambient air temperature under laboratory conditions. Moreover, in PAC specimens, temperature distributed more unevenly than in dense-grade asphalt mixtures. Therefore, it is necessary to consider the internal meso-structure of porous asphalt mixtures while simulating the temperature field in PAC specimens or pavement structures.
引用
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页数:21
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