Monitoring crack movement in polymer-based self-healing concrete through digital image correlation, acoustic emission analysis and SEM in-situ loading

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• 作者：J. Feiteira^a ; ^{j.feiteira@ugent.be} ; E. Tsangouri^b ; ^{etsangou@vub.ac.be} ; E. Gruyaert^a ; ^{elke.gruyaert@ugent.be} ; C. Lors^c ; ^{christine.lors@mines-douai.fr} ; G. Louis^c ; ^{ghislain.louis@mines-douai.fr} ; N. De Belie^a ; ^{nele.debelie@ugent.be}
• 关键词：Concrete ; Cracks ; Interfaces ; Polymers ; Self-healing ; Monitoring
• 刊名：Materials & Design
• 出版年：2017
• 出版时间：5 February 2017
• 年：2017
• 卷：115
• 期：Complete
• 页码：238-246
• 全文大小：2218 K
• 卷排序：115

文摘

New cracks develop if a rigid polymer is used to heal a crack, as it transfers the stress to adjacent areas. Polymers with high elongation (> 100%) and modulus of elasticity much lower than 10 MPa are required for moving cracks. A polymer with high modulus of elasticity used as healing material also results in detachment from the crack walls. A burst of acoustic events including high energy emissions can be used to monitor failure if brittle fracture is present. Digital image correlation allowed precise detection of brittle failure under an increasing crack movement.