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Evaluation of methodologies for assessing self-healing performance of concrete with mineral expansive agents: an interlaboratory study

Litina, Chrysoula, Bumanis, Girts, Anglani, Giovanni, Dudek, Marta, Maddalena, Riccardo ORCID:, Amenta, Maria, Papaioannou, Stamatoula, Pérez, Gloria, García Calvo, José Luis, Asensio, Eloy, Beltrán Cobos, Rubén, Tavares Pinto, Fabiano, Augonis, Algirdas, Davies, Robert ORCID:, Guerrero, Ana, Sánchez Moreno, Mercedes, Stryszewska, Teresa, Karatasios, Ioannis, Tulliani, Jean-Marc, Antonaci, Paola, Bajare, Diana and Al-Tabbaa, Abir 2021. Evaluation of methodologies for assessing self-healing performance of concrete with mineral expansive agents: an interlaboratory study. Materials 14 (8) , 2024. 10.3390/ma14082024

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Self-healing concrete has the potential to optimise traditional design approaches; however, commercial uptake requires the ability to harmonize against standardized frameworks. Within EU SARCOS COST Action, different interlaboratory tests were executed on different self-healing techniques. This paper reports on the evaluation of the effectiveness of proposed experimental methodologies suited for self-healing concrete with expansive mineral additions. Concrete prisms and discs with MgO-based healing agents were produced and precracked. Water absorption and water flow tests were executed over a healing period spanning 6 months to assess the sealing efficiency, and the crack width reduction with time was monitored. High variability was reported for both reference (REF) and healing-addition (ADD) series affecting the reproducibility of cracking. However, within each lab, the crack width creation was repeatable. ADD reported larger crack widths. The latter influenced the observed healing making direct comparisons across labs prone to errors. Water absorption tests highlighted were susceptible to application errors. Concurrently, the potential of water flow tests as a facile method for assessment of healing performance was shown across all labs. Overall, the importance of repeatability and reproducibility of testing methods is highlighted in providing a sound basis for incorporation of self-healing concepts in practical applications.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Additional Information: This article is an open access article distributed under the terms and con‐ ditions of the Creative Commons At‐ tribution (CC BY) license (http://crea‐
Publisher: MDPI
ISSN: 1996-1944
Funders: EPSRC
Date of First Compliant Deposit: 21 April 2021
Date of Acceptance: 14 April 2021
Last Modified: 07 Aug 2023 21:05

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