2D Mesoscale cracking simulation of partially saturated asphalt based on moisture diffusion and a cohesive zone model

Abstract

The primary objective of this paper was to develop a combined model that incorporates moisture diffusion and a cohesive zone model, addressing anisotropic and loading-rate dependent cracking within partially saturated asphalt. Utilising X-ray CT scan, cross-sectional slices of asphalt were acquired and converted into vector images through Matlab and AutoCAD, forming a digital asphalt sample. Moisture concentration in the asphalt, after different immersion durations, was quantified by Fick's law. A sequentially coupled model of moisture diffusion and fracture investigated the effect of immersion duration, anisotropy, and loading rate on cracking performance of the asphalt during a digital indirect tensile strength test (DITST) at 5°C. Findings revealed that moisture evolution in partially saturated asphalt proceeds through two or three stages: near-zero growth (only applicable for locations far from the initial moisture-asphalt interface), rapid growth, and a plateau. Peak load, stiffness, and fracture work in DITST exponentially reduced with immersion duration, predominantly within the first four weeks. Anisotropy led to differential DITST results when varying loading direction. Moisture damage decreased crack resistance across all directions, while increasing loading rate enhanced it. Fracture stiffness and strength exhibited comparable impacts on cracking performance at a specific loading rate.

Publication DOI: https://doi.org/10.1080/10298436.2023.2242557
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Civil Engineering
Funding Information: The authors would like to acknowledge the financial support from the Engineering and Physical Sciences Research Council (grant number EP/T019506/1), and the National Natural Science Foundation of China (grant number 51978229 and No. 52278450).
Additional Information: Copyright © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent. Funding: This work was supported by Engineering and Physical Sciences Research Council: [Grant Number EP/T019506/1]; National Natural Science Foundation of China: [Grant Number 51978229].
Uncontrolled Keywords: Asphalt,cracking,cohesive zone model,moisture diffusion
Publication ISSN: 1029-8436
Last Modified: 29 Feb 2024 08:24
Date Deposited: 04 Sep 2023 10:52
Full Text Link:
Related URLs: https://www.tan ... 36.2023.2242557 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2023-08-05
Published Online Date: 2023-08-05
Accepted Date: 2023-07-25
Authors: Li, Linglin
Wu, Ji
Thom, Nick
Hargreaves, David
Airey, Gordon
Abed, Ahmed
Rahman, Mujib (ORCID Profile 0000-0002-5177-4159)
Zhang, Zhen

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