Mechanics Mechanism Analysis of Asphalt-Aggregate Interface Damage

Abstract:

In the areas of South China, the asphalt pavement will appear various forms of water damages under the condition of vehicle loads and humid rainy environment. The interface of between aggregate and asphalt is the weaknesses position of the mixture internal structure, which will impose a significant influence on the service life of asphalt mixtures. However, the existing mesomechanics models of asphalt mixtures are almost based on the three-phase composite materials (asphalt mortar, aggregate, void) and have no enough consideration for the actual mechanics characteristics of the weak interface. It is no doubt that the effectiveness of the numerical simulation results will face a great challenge. The main purposes of this paper is to analyze and summary the relative basic characteristics of asphalt-aggregate interface including interface contact behavior, microstructure characterization methods, interface damage features and the macro-micro quantitative evaluation method of the interface damage The results show that the existing mechanical model ignores the asphalt-aggregate interface imperfect bonding, which make the asphalt-aggregate interface mechanical properties difficult to be perceived. Therefore, establishing a more rational micromechanical analysis model to predict asphalt macroscopic mechanical properties of asphalt mixtures will certainly be an urgent task and will provide a theoretical and scientific support for the optimization of asphalt mixture design.

• Periodical: Key Engineering Materials (Volume 667)
• Pages: 359-364
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.667.359
• Online since: October 2015
• Authors: Qing Yang, Shang Lin Xiao, Xin Qiu, Xiao Hua Luo, Yu Jie Wang
• Keywords: Asphalt Mixture, Asphalt/Aggregates Interface, Damage, Mechanical Mechanism

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