Micromechanics-Based Analysis of the Effect of Aggregate Homogeneity on the Uniaxial Penetration Test of Asphalt Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 11
Abstract
Based on the microstructure-based discrete-element method (DEM), this study aims to investigate the effect of vertical aggregate homogeneity, i.e., aggregate homogeneity in vertical cross sections, on the uniaxial penetration test of asphalt mixtures. An aggregate homogeneity index, which can be used to evaluate aggregate homogeneity in a two-dimensional (2D) cross section, was briefly introduced. The vertical aggregate distribution was evaluated by the index. Microstructure-based discrete-element modeling of a uniaxial penetration test was accomplished by a discrete-element program called particle flow code in two dimensions. The effect of vertical aggregate homogeneity on penetration strengths regarding a uniaxial penetration test was simulated by the DEM. The obtained results were verified by uniaxial penetration testing. Results show that the effect of vertical aggregate homogeneity on penetration strengths can be numerically simulated by the microstructure-based DEM. The penetration strengths in the uniaxial penetration test are anisotropic. Vertical aggregate homogeneity also dominates the variation of penetration strengths in the uniaxial penetration test. A good correlation between vertical aggregate homogeneity and the variation of penetration strengths is also observed.
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Acknowledgments
The authors would like to thank the Zhejiang Provincial Natural Science Foundation of China (LY15E080006) and China Scholarship Council for their financial support of this research.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 11 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 29, 2015
Accepted: Feb 29, 2016
Published online: May 26, 2016
Discussion open until: Oct 26, 2016
Published in print: Nov 1, 2016
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