Experimental study of compression-tension asymmetry in asphalt matrix under quasi-static and dynamic loads via an integrated DMA-based approach

Journal article (2021)

Authors

Z. Dai Tongji University, Universiteit Gent

Affiliation

External organisation

Self-healing Dynamic mechanical analysis Asphalt matrix Visco-elasto-plasticity Compression-tension asymmetry Strain-rate dependency CONCRETE DAMAGE SIMULATION FATIGUE TEMPERATURE MIXTURES

To reference this document use:

http://resolver.tudelft.nl/uuid:d03de1bb-7e5c-4c61-83fc-03db156fe736

More Info

expand_more

Published Date

2021

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Affiliation

External organisation

Abstract

This research presents an experimental approach to study the mechanics of asphalt matrix, a crucial component in asphalt concrete, consisting of asphalt binder, fine aggregates and filler. Understanding its response is essential to guide and improve the new designs in advanced asphalt concrete. The proposed approach makes use of the dynamic mechanical analysis (DMA) to execute a variety of quasi-static and dynamic tests under tension and compression. Uniaxial tests reveal a remarkable compression-tension asymmetry of the asphalt matrix in terms of stiffness and strength. The peak stress and stiffness can be 5 and 3 times, respectively, larger under compression than in tension. Both properties strongly depend on the strain rate, albeit stiffness and peak stress in compression are more sensitive than in tension. A straightforward equation for 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 inherent self-healing capabilities of asphalt matrix at room temperature. Doubling the regularity of resting periods significantly helps to regain the stiffness and it leads to a 4-times extension of the fatigue life.