Characteristics of Force Chain Composition in Asphalt Mixture Under Compression
WANG Wei1, LIU Bo2, SONG Ge2, XU Yongjiang1, TAN Yiqiu1,3,*
1 School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China 2 Heilongjiang Transportation Investment Group Co., Ltd., Harbin 150028, China 3 State Key Laboratory of Urban Water Resources and Water Environment, Harbin Institute of Technology, Harbin 150090, China
Abstract: To quantitatively evaluate the contribution of components in asphalt mixture under compression, a high-precision 3D model construction met-hod was proposed based on the discrete element method. Uniaxial compression simulation at room-temperature was achieved, visualizing the strength distribution of force chains. The concept of strong-weak force chains was proposed to characterize the force characteristics, and using statistical methods for force chain analysis. The results show that under uniaxial compression mode, the internal contact force of SMA13 is 61.9% provided by aggregates, while AC13 is only 24.9%. Aggregates only take effect under compression, and asphalt mortar can resist compression and tension. The proportion of asphalt mortar affects the stress distribution, with a strength chain accounting for 35%—45% and evenly distributed. The strength of the force chain gradually decreases as the angle approaches the horizontal direction, and the amplitude of change in the strength of the interface force chain is small. Asphalt mixture design should be based on the mechanical characteristics of each component.
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2026, Vol. 40 
