Monitoring of self-healing cementitious materials through contactless ultrasound Gerlinde Lefever, Ahmad Shawki Charkieh, Danny Van Hemelrijck, Didier Snoeck and Dimitrios G. Aggelis MATEC Web Conf., 378 (2023) 04001 Published online: 28 April 2023 DOI: 10.1051/matecconf/202337804001