The composition of the material phase responsible for the self-healing of macro-cracks in asphalt mortar beams

Grossegger, Daniel; Garcia, Alvaro; Airey, Gordon

Abstract

Self-healing of asphalt is assumed to be a flow process where bitumen flows into cracks to close them. Hence, the rheological behaviour of bitumen is one of the main factors affecting self-healing together with damage history, healing duration and pressure (external compressive forces or internal thermal expansion). Bitumen-filler interaction influences the flow and it is hypothesised that the material flowing into cracks during self-healing is a mixture of bitumen, filler and eventually fine aggregates. In the paper, the self-healing ratio was determined by mechanical testing and the self-healing was accelerated by an increase of temperature to 100°C. Material draining from asphalt mortar beams into a horizontal gap, representing a crack, was found to be a mixture of bitumen and aggregates with increasing self-healing observed with increasing bitumen and filler content. For the mortar mixture used in this study, a bitumen content of 5.4 wt% was identified to be the limit for self-healing.

Citation

Grossegger, D., Garcia, A., & Airey, G. (2022). The composition of the material phase responsible for the self-healing of macro-cracks in asphalt mortar beams. Road Materials and Pavement Design, 23(3), 656-665. https://doi.org/10.1080/14680629.2020.1842793

• Journal Article Type: Article
• Acceptance Date: Oct 23, 2020
• Online Publication Date: Nov 11, 2020
• Publication Date: Mar 4, 2022
• Deposit Date: Dec 3, 2020
• Publicly Available Date: Nov 12, 2021
• Journal: Road Materials and Pavement Design
• Print ISSN: 1468-0629
• Electronic ISSN: 2164-7402
• Publisher: Taylor and Francis
• Peer Reviewed: Peer Reviewed
• Volume: 23
• Issue: 3
• Pages: 656-665
• DOI: https://doi.org/10.1080/14680629.2020.1842793
• Keywords: Civil and Structural Engineering
• Public URL: https://nottingham-repository.worktribe.com/output/5098238
• Publisher URL: https://www.tandfonline.com/doi/full/10.1080/14680629.2020.1842793
• Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis in Road Materials and Pavement Design on 11/11/20, available online: http://www.tandfonline.com/10.1080/14680629.2020.1842793