Investigation into the force chain transmission mechanism of asphalt mixture under indirect tensile mode

• Published in: Construction & building materials Vol. 411; p. 134500
• Main Authors: Tan, Yiqiu, Wang, Wei, Xu, Yongjiang, Xing, Chao, Hu, Jinyuan, Li, Song, Dai, Mingxin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 12.01.2024
• Subjects: Asphalt mixture; Discrete element method; Force chain angle; Force chain transmission; Indirect tensile test; Asphalt mixture; Force chain angle; Discrete element method; Indirect tensile test; Force chain transmission
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2023.134500

Since the correlation between the meso-structure composition and force chain transmission of asphalt mixtures, it has a significant impact on the evaluation and utilization of their material properties. Based on the discrete element method, this paper studied the internal force chains transmission mechanism of asphalt mixture under indirect tensile mode, and quantitatively analyzed the composition and distribution of the force chains. An aggregate template library for asphalt mixture was constructed using image segmentation and clump generation algorithm. Indirect tensile simulation was achieved by assigning relevant parameters, indicating a good correlation with laboratory tests. The tensile and compressive chain fields inside asphalt mixtures were visualized and characterized. The concept of strong and weak force chains was proposed, and statistical methods was used to analyze the strength, distribution, and evolution of force chains. The force transfer mechanisms of different components of asphalt mixtures have been elucidated, providing a research tool for their structural design and performance evaluation. •The aggregate template library was constructed within PFC3D.•Virtual indirect tensile test was built to analyze mechanical property.•The probability and distribution of the force chains were proposed.•The evolution law of the force chains was clarified.