Journal Published Online: 31 January 2020
Volume 48, Issue 3

Investigation on Indirect Tensile Test of Asphalt Mixture Based on the Discrete Element Method

CODEN: JTEVAB

Abstract

The indirect tensile test is commonly used to evaluate crack and fatigue resistance of asphalt mixtures. However, laboratory tests are time-consuming and laborious in general. Numerical simulation provides a technical way for studying the mechanical behavior of asphalt mixtures. In this research, a laboratory test and discrete element method were used to explore the effects of temperature, air void content, loading rate, and the homogeneity of a mixture on the splitting strength of asphalt mixtures. For asphalt mixtures, a three-dimensional random modeling method and two-dimensional modeling method based on X-ray computed tomography and digital image processing were developed. Also, a homogeneity evaluation index based on ring segmentation was proposed. The results show that an increase in loading rate and decrease in temperature resulted in a significant increase in splitting strength. With an increase in voids, the splitting strength of an asphalt mixture decreased. The Pearson correlation coefficient indicates that there seems to be no clear connection between splitting strength and homogeneity, but there is a significant correlation between the homogeneity and differences in the splitting strength.

Author Information

Wu, Shuyin
School of Transportation, Southeast University, Nanjing, Jiangsu, P.R. China
Xu, Gang
School of Transportation, Southeast University, Nanjing, Jiangsu, P.R. China
Yang, Jun
School of Transportation, Southeast University, Nanjing, Jiangsu, P.R. China
Yang, Ruochong
School of Transportation, Southeast University, Nanjing, Jiangsu, P.R. China
Zhu, Jipeng
School of Science, Nanjing University of Science and Technology, Nanjing, Jiangsu, P.R. China
Pages: 17
Price: $25.00
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Details
Stock #: JTE20190532
ISSN: 0090-3973
DOI: 10.1520/JTE20190532