Issue |
MATEC Web Conf.
Volume 409, 2025
Concrete Solutions 2025 – 9th International Conference on Concrete Repair, Durability & Technology
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Article Number | 09001 | |
Number of page(s) | 7 | |
Section | Repair & Strengthening Materials and Techniques 1 | |
DOI | https://doi.org/10.1051/matecconf/202540909001 | |
Published online | 13 June 2025 |
Assessing the bond strength of expansive agent-enhanced repair mortars for ageing concrete structures
Univ Rennes, INSA Rennes, LGCGM (Laboratoire de Génie Civil et Génie Mécanique) – France
As reinforced concrete structures age, they increasingly require extensive maintenance and repair. Due to their limited lifespan, repair materials are often susceptible to early cracking, resulting from environmental influences, deformation, and physical-chemical incompatibilities between the repair material and the substrate. In line with sustainable development goals, minimising costly maintenance and repairs is essential. Self-healing mortar presents a promising solution to extend the durability of repaired structures and reduce long-term maintenance needs. The primary objective of this research is to evaluate the self- healing capacity of a cementitious material containing magnesium oxide and calcium sulfo-aluminate-based expansive agents, as well as to assess its mechanical performance under repair conditions. Healing kinetics are monitored through water permeability tests on cylindrical specimens precracked at 28 days. To validate the suitability of the studied mortars for repair applications, their bond strength is measured using pull-off tests under various concrete substrate conditions, including different roughness and saturation levels. Experimental results indicate that incorporating an expansive agent enhances the autonomous healing potential of mortars, with mortars containing calcium sulfo-aluminate-based expansive agents demonstrating superior bond strength and a better healing capacity.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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