Virtual-specimen modeling of aggregate contact effects on asphalt concrete

Tan, Zhifei; Jelagin, Denis; Fadil, Hassan; Leng, Zhen; Li, Rui; Jiang, Jiwang; Cao, Peng

doi:10.1016/j.conbuildmat.2023.132638

Cited by 8 publications

(1 citation statement)

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“…Fine aggregate matrix (FAM), typically composed of fine aggregates, mineral fillers, and asphalt binders [1][2][3], has been widely employed for evaluating the mechanical properties of asphalt binder and asphalt concrete (AC). Acting as the matrix phase of AC, FAM fills the voids in the coarse aggregates' skeleton structure and binds them together, bridging the binder and AC [4,5].…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance analysis of fine aggregate matrix using a newly designed experimental strategy and viscoelastic continuum damage theory

Tan,

Li,

Leng

et al. 2024

Mater Struct

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Fine aggregate matrix (FAM), as the matrix phase in asphalt concrete (AC), significantly affects the fatigue behavior of AC. To accurately assess the mechanical properties of FAM, a newly designed experimental strategy for FAM testing was developed, and the viscoelastic continuum damage theory (VECD) theory was applied to analyze FAM’s fatigue cracking characteristics. In this study, a dumbbell-shaped geometry for dynamic shear rheometer testing was designed and verified through the FE-aided method. Subsequently, three AC mixtures’ FAM specimens with this special geometry were fabricated for the frequency sweep and linear amplitude sweep tests. Results showed that the specially designed specimens effectively capture the viscoelastic and fatigue properties of FAM with high replicability. Analyses based on the VECD theory indicated that FAM of porous asphalt (FAM(PA13)), featuring a higher asphalt content, exhibits a significant reduction in pseudo stiffness with increasing damage at the initial stage, but the reduction rate diminishes as damage progresses when compared to the other two FAMs. It was speculated that the higher aggregate content in FAM of dense-graded AC mixture (FAM(AC20) induces stress concentrations in the asphalt mastic near the protrusion areas of aggregates, thereby rendering the sample more susceptible to damage. The proposed methods will be readily extended to characterize other mechanical properties of FAM.

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