Abstract
Focused on the fatigue performance of the asphalt mortar, this study proposed an assessment model for fatigue damage evolution based on the continuum mechanics. From the perspective of the material scale rather than the macrostructure, the proposed damage model was set by concentrating on the stress‐strain state of a tiny point which could characterize the material performance accurately. By the mechanical formula derivation and based on the four‐point bending fatigue tests, the damage evolution law was determined and then the proposed model was verified. Based on the finite element method (FEM), a commercial software named ABAQUS was utilized to develop the random mixtures consisting of coarse aggregates, mortar, and voids. Eventually, combined with the damage model and virtual simulation of bending tests, the factors influencing the fatigue resistance of the whole asphalt mixtures were analyzed further.
Highlights
Asphalt mixture is a three-phase structure consisting of aggregate, void, and mortar [1,2,3]. e asphalt mortar, acting as a bonding layer between adjacent particles, has been highlighted by many researchers to play an important role in the performance of the whole mixtures [4, 5]
Tests conducted by Tan et al [6] have pointed out that the fine aggregate properties play an important role in the viscoelastic performance of the asphalt mortar
Two types of the specimens are needed in the following process: (a) asphalt mixtures consisting of asphalt binder, mineral powder, and aggregates and (b) asphalt mortar consisting of asphalt binder, mineral powder, and the fine part of aggregates. e testing gradation of the asphalt mixture is shown in Figure 1(a) meeting the requirements of Chinese standard [26]
Summary
Focused on the fatigue performance of the asphalt mortar, this study proposed an assessment model for fatigue damage evolution based on the continuum mechanics. From the perspective of the material scale rather than the macrostructure, the proposed damage model was set by concentrating on the stress-strain state of a tiny point which could characterize the material performance accurately. By the mechanical formula derivation and based on the four-point bending fatigue tests, the damage evolution law was determined and the proposed model was verified. Based on the finite element method (FEM), a commercial software named ABAQUS was utilized to develop the random mixtures consisting of coarse aggregates, mortar, and voids. Combined with the damage model and virtual simulation of bending tests, the factors influencing the fatigue resistance of the whole asphalt mixtures were analyzed further
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