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Air-coupled ultrasonic mapping of stimulated autogenous self-healing and repair effectiveness within concrete mixtures

par Lefever, Gerlinde;Abdullah, Ahmad;Van Hemelrijck, Danny;Snoeck, Didier ;Aggelis, Dimitrios G.
Référence Construction & building materials, 419, page (135547)
Publication Publié, 2024-03-01

Article révisé par les pairs

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Résumé :

Due to the high risk of cracking, the adequate repair of concrete structures has become equally important to the design of cementitious mixtures. As these repairs should provide a certain level of safety to the user, the assessment of the regained performance needs to be confirmed. Air-coupled ultrasound combines a non-destructive character together with a fast and easy application. Within the present study, two main objectives are pursued. One is the use of air-coupled receivers as a step towards a fully non-contact methodology. Additionally, the effectiveness of air-coupled ultrasonic mapping is applied to both self-healing mixtures and manually repaired specimens. Additionally, two different ultrasonic frequencies are adopted. The results show that air-coupled ultrasonic mapping enables to monitor the processes of cracking, self-healing and repair within the entire cross-section through a point-by-point measurement. Moreover, the use of different frequencies demonstrates the increased sensitivity of the higher frequencies to follow-up these mechanisms. Lastly, from the material point of view, the mixture with 1% SAP revealed the highest self-healing capacity, whereas the manual repair through polyurethane was superior to all self-healing blends.