Evaluation of self-healing in concrete by means of analytical techniques

0532113 - ÚTAM 2021 RIV CH eng C - Konferenční příspěvek (zahraniční konf.)
Aspiotis, K. - Sotiriadis, Konstantinos - Kumpová, Ivana - Mácová, Petra - Badogiannis, E. - Tsivilis, S.
Evaluation of self-healing in concrete by means of analytical techniques.
Solid State Phenomena. Vol. 309. Baech: Trans Tech Publications, 2020 - (Nenadálová, Š.; Johová, P.), s. 38-43. ISBN 978-3-0357-1668-9. ISSN 1012-0394. E-ISSN 1662-9779.
[International Conference Concrete Days /26./. Hradec Králové (CZ), 20.11.2019-21.11.2019]
Institucionální podpora: RVO:68378297
Klíčová slova: self-healing * concrete * chemical additives * Raman spectroscopy * X-ray tomography
Obor OECD: Construction engineering, Municipal and structural engineering
Způsob publikování: Omezený přístup
https://doi.org/10.4028/www.scientific.net/SSP.309.38

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 control) were prepared with a water-to-binder ratio 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 ≤ 900 μm) and then again water-cured for further 60 days until selfhealing occurred. The progress of self-healing was investigated with a stereomicroscope at 40, 50, and 60 days, after cracking, to identify the quality and the degree of the healing. The efficiency of the self-healing process was also evaluated using micro-Raman spectroscopy and X-ray micro-computed tomography. Significant reduction in the crack width was observed as a result of a calcite filling, generated during the self-healing process. In some cases (crack width < 400 μm), the crack was completely healed. The experimental methodology used provided new insights into the evolution of the self-healing phenomenon in concrete.
Trvalý link: http://hdl.handle.net/11104/0310725