粗集料接触配位参数影响下沥青混合料的抗断裂特性研究

doi:10.11896/cldb.23050048

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Abstract To investigate the impact of mesoscale skeleton optimization on the fracture resistance of asphalt mixes, the relationship between the contact behaviors of coarse aggregates on the dominant skeleton and the fracture resistance of asphalt mixes at the mesoscale was studied. Based on the particle accumulation theory and mesoscale contact mechanics, the coordination number of particles contact force (C_npcf) for coarse aggregates was modified to characterize the mesoscale contact characteristics in the dominant structure. And nine kinds of asphalt mixes with diffrent meso-structural garadations were designed. Appropriate fracture resistance evaluation criteria were identified based on the semicircular bending test (SCB). Co-processing for digital images on specimen surfaces after the SCB test was implemented by Python programming, and the regularity of fracture extension with varied C_npcf was explored at the mesoscale. Finally, the gray correlation between various structure characteristic parameters and fracture performance was comprehensively analyzed according to the gray relational analysis and entropy theory. The results indicated that the strength and energy indicators of the asphalt mixture exhibited the trend of increasing and then decreasing with the increase of C_npcf. When C_npcf eaquals to 7.35, the asphalt mixture has better fracture resistance (σ_m=1.18 MPa, G_f=3 003.4 J/m², CRI=509.1). Moreover, the crack area and length expands linearly with the increasing of loading displacement, but the loading displacement was not consistent for notably appeared cracks appeared under varying C_npcf. Thus, the capacity of the mix resisting fracture dilation will be enhanced by restricting the C_npcf between 7.2 and 7.6. Significant gray correlations of C_npcf with fracture resistance on both energy and strength levels were observed under distinct temperature conditions, which provides new perspectives for optimizing asphalt mixture performance at mesoscales.

Key words： road engineering asphalt mixture fracture resistance mesoscale structure optimization particle accumulation theory digital image processing

Published: 10 December 2024 Online: 2024-12-10

CLC number:

U414

Fund:Fundamental Research Funds for the Central Universities, CHD (300102314902), Natural Science Basic Research Program of Shaanxi (2024JC-YBMS-374), and the National Natural Science Foundation of China (51608045).

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	Articles by authors
	NIU Dongyu
	HUANG Shan
	SHI Weibo
	XIE Xiwang
	WANG Yan
	GAO Yangming

Cite this article:

NIU Dongyu,HUANG Shan,SHI Weibo, et al. Fracture Resistance of Asphalt Mixtures Under the Effect of the Coordination Number of Particles Contact Forces of Coarse Aggregates[J]. Materials Reports, 2024, 38(23): 23050048-10.

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http://www.mater-rep.com/EN/10.11896/cldb.23050048 OR http://www.mater-rep.com/EN/Y2024/V38/I23/23050048

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