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Evaluation of self-healing in concrete by means of analytical techniques
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SYSNO ASEP 0511548 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Evaluation of self-healing in concrete by means of analytical techniques Author(s) Aspiotis, K. (GR)
Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAI
Kumpová, Ivana (UTAM-F) RID, SAI, ORCID
Mácová, Petra (UTAM-F) RID, SAI, ORCID
Badogiannis, E. (GR)
Tsivilis, S. (GR)Number of authors 6 Source Title 26. konference Betonářské dny 2019. Sborník přednášek. - Praha : Česká betonářská společnost ČSSI, 2019 / Jandová K. ; Nenadálová Š. ; Vích J. - ISBN 978-80-907611-2-4 Number of pages 8 s. Publication form Medium - C Action Betonářské dny /26./ Event date 20.11.2019 - 21.11.2019 VEvent location Hradec Králové Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords self-healing ; concrete ; chemical additives ; Raman spectroscopy ; X-ray tomography Subject RIV JM - Building Engineering OECD category Construction engineering, Municipal and structural engineering Institutional support UTAM-F - RVO:68378297 Annotation In the present work, the self-healing process in concrete was evaluated using analytical techniques. For this purpose, two concrete mixes of different composition (one used as reference) were prepared with a W/B of 0.45. The self-healing process was triggered by the introduction in the concrete mix of a commercial expansive admixture (calcium sulfo-aluminate), two dicarboxylic acids, and sodium carbonate salt. After 28 days curing in water, the specimens were artificially cracked (crack width ≈ 400 μm) and then again water-cured for 40 days until self-healing occurred. The progress of self-healing was investigated with a stereo-microscope at 40, 50 and 60 days. The efficiency of the process was evaluated using micro-Raman spectroscopy and X-ray micro-computed tomography (XmCT). Significant reduction in the crack width was observed as a result of filling the crack with calcite generated during the self-healing process. In some cases, the crack was completely healed. The experimental methodology used provided new insights into the evolution of the self-healing phenomenon in concrete. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2020
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