Numerical creep test of asphalt mixture based on X-ray computed topography and finite element method

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Journal of Dalian Maritime University ›› 2014, Vol. 40 ›› Issue (1) : 123-127.

WANG Cong^1,2, GUO Nai-sheng^1,2, ZHAO Ying-hua^1,2, TAN Yi-qiu³

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Abstract

To analyze the effect of homogeneous model and heterogeneous model on the results of numerical simulation and the choice of optimum test section in creep test under two-dimension numerical condition, X-ray computed technique and digital image processing technique were performed and the Burgers model was adopted to characterize the viscoelasticity of asphalt mortar and asphalt mixtures, and furthermore numerical model was established based on finite element method to study creep behaviors for homogeneous model and heterogeneous model and analyze the location of the optimum test section through choosing three sections along the height direction of the specimen. Results show that creep deformation curves of numerical test of heterogeneous model was close to laboratory test, and the variety of creep deformation curves of numerical experiment for different sections along the height direction of the specimen is almost consistent . Moreover, heterogeneous model displays the distribution of complicated stress of every component in the specimen. Therefore, heterogeneous model can simulate the laboratory creep test more accurately, and every test section of it can be chosen arbitrarily to be the optimum test section.

Key words

asphalt mixture / creep / X-ray CT / finite element methods / digital image

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WANG Cong, GUO Nai-sheng, ZHAO Ying-hua, TAN Yi-qiu. Numerical creep test of asphalt mixture based on X-ray computed topography and finite element method[J]. Journal of Dalian Maritime University. 2014, 40(1): 123-127

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