Constitutive modeling and experimental investigation of rate-dependent compression-tension asymmetry of asphalt matrix

Conference paper (2022)

Authors

Z. Dai Tongji University, Universiteit Gent
V. Laheri Universiteit Gent
Xingyi Zhu Tongji University
Francisco A. Gilabert Universiteit Gent
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Published Date

2022

Language

English

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Abstract

This research presents an experimental and numerical approach to study the mechanics of asphalt matrix, a crucial component in asphalt concrete. Understanding its response is essential to guide the new designs in advanced asphalt concrete. The dynamic mechanical analysis (DMA) is used to execute a variety of quasi-static and dynamic tests under tension and compression. Uniaxial tests reveal a remarkable rate-dependent compression-tension (C-T) asymmetry of the asphalt matrix in terms of stiffness and strength. The creep rupture envelop is derived by performing creep tests at different stress levels. Amplitude and frequency sweep tests and fatigue-recovery test are performed to explore the fatigue response. A user-material visco-elasto-plastic-damageable (VEPD) model is developed to simulate the asphalt via finite element method (FEM).