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

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 selfhealing techniques. This paper...

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Bibliographic Details
Authors: Litina, Chrysoula, Bumanis, Girts, Anglani, Giovanni, Dudek, Marta, Maddalena, Riccardo, Amenta, Maria, Papaioannou, Stamatoula, Pérez Álvarez-Quiñones, Gloria, García Calvo, José Luis, Asensio, Eloy, Beltrán Cobos, Rubén, Tavares, Fabiano, Augonis, Algirdas, Davies, Robert, Guerrero Bustos, Ana María, Sánchez Moreno, Mercedes, Stryszewska, Teresa, Karatasios, Ioannis, Tulliani, Jean-Marc, Antonaci, Paola, Bajare, Diana, Al-Tabbaa, Abir
Format: article
Status:Published version
Publication Date:2021
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/258378
Online Access:http://hdl.handle.net/10261/258378
Access Level:Open access
Keyword:Round robin
Self-healing concrete
Standardization
Expansive minerals
Crack sealing
Durability
Description
Summary: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 selfhealing 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.

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