1. Chang'an University, Xi'an Shaanxi 710064, China;
2. China Academy of Transportation Sciences, Beijing 100029, China;
3. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou Guangdong 510640, China
Virtual Uniaxial Creep Testing Method of Asphalt Mixture
CHEN Ming1,2, ZHAO Xin-hui2, WAN Cheng3
1. Chang'an University, Xi'an Shaanxi 710064, China;
2. China Academy of Transportation Sciences, Beijing 100029, China;
3. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou Guangdong 510640, China
摘要This paper presents a virtual uniaxial creep testing method. Different gradations were selected, and the X-ray CT was used to scan the asphalt specimens non-destructively in order to predict the deformation of asphalt mixture and verify the feasibility of the proposed method. Moreover, the finely distributed information of asphalt mixture microstructure, including aggregates, sand mastic and air voids, were captured. The 3D virtual specimen reflecting the real microscale distribution of asphalt mixture was created according to the developed 3D reconstruction theory and algorithm. Considering the Burgers visco-elastic consecutive relations of sand mastic, the visco-elastic state of sand mastic was transformed to the Prony parameters identified by finite element by using the Boltzmann superposition principle and Laplace theory. Finally, the virtual uniaxial creep testing was conducted. Results show that the predicted deformations agree well with the testing results. The proposed virtual uniaxial creep method accurately reflects different deformations for different gradations, thus overcoming the defects of conventional numerical simulation based on homogeneous specimen.
Abstract：This paper presents a virtual uniaxial creep testing method. Different gradations were selected, and the X-ray CT was used to scan the asphalt specimens non-destructively in order to predict the deformation of asphalt mixture and verify the feasibility of the proposed method. Moreover, the finely distributed information of asphalt mixture microstructure, including aggregates, sand mastic and air voids, were captured. The 3D virtual specimen reflecting the real microscale distribution of asphalt mixture was created according to the developed 3D reconstruction theory and algorithm. Considering the Burgers visco-elastic consecutive relations of sand mastic, the visco-elastic state of sand mastic was transformed to the Prony parameters identified by finite element by using the Boltzmann superposition principle and Laplace theory. Finally, the virtual uniaxial creep testing was conducted. Results show that the predicted deformations agree well with the testing results. The proposed virtual uniaxial creep method accurately reflects different deformations for different gradations, thus overcoming the defects of conventional numerical simulation based on homogeneous specimen.
基金资助:Supported by the Special Funds for Basic Scientific Research Business of Central Universities(No.20112B0017);the China Postdo-ctoral Science Foundation (No.20110490092)
陈明, 赵新惠, 万成. 沥青混合料虚拟单轴蠕变试验方法[J]. Journal of Highway and Transportation Research and Development, 2016, 10(1): 10-16.
CHEN Ming, ZHAO Xin-hui, WAN Cheng. Virtual Uniaxial Creep Testing Method of Asphalt Mixture. Journal of Highway and Transportation Research and Development, 2016, 10(1): 10-16.
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2016, Vol. 10 
