Abstract
This study aims to investigate the viscoelastic creep properties of basalt fiber (BF)-reinforced asphalt concrete (BFRAC) by considering different factors based on two-dimensional (2D) mesostructure model. A 2D mesostructure model composed of coarse aggregate and BF asphalt mortar matrix is constructed through the image processing of section scanning for semicircular bending (SCB) samples, where BFs are assumed to be completely dispersed in the mortar matrix. Subsequently, the creep deformation of the 2D numerical sample model in ABAQUS software is simulated to investigate the effect of its components on the viscoelastic properties of BFRAC. Meanwhile, SCB creep tests are conducted at 15 °C under 0% and 0.3% BF contents for two types asphalt concretes, namely, AC13 and AC20 gradations, to verify the simulation results. Results show that the creep deformations of the SCB model are consistent with those of the testing. Furthermore, numerical simulations are conducted to analyze the influence of aggregate modulus and BF factors (e.g., fiber contents, aspect ratios, and fiber modulus) on the viscoelastic behavior of BFRAC. The increase in fiber contents and aspect ratios have a positive reinforcement effect on creep properties. However, the changes in the modulus of the components have minimal effects on the properties of BFRAC.
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