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29Si NMR investigation of the effect of acetic and oxalic acids on Portland-limestone cement hydration
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SYSNO ASEP 0563761 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title 29Si NMR investigation of the effect of acetic and oxalic acids on Portland-limestone cement hydration Author(s) Mazur, A. (RU)
Tolstoy, P. M. (RU)
Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAINumber of authors 3 Source Title Materials Science Forum, Construction and Bio-Based Materials: Properties and Technologies, 1071. - Baech : Trans Tech Publications, 2022 / Meile K. ; Cabulis U. ; Kirpluks M. ; Han Y. ; Liang F. ; Dvořák K. ; Gazdič D. - ISSN 1662-9752 - ISBN 978-3-0364-0186-7 Pages s. 247-252 Number of pages 6 s. Publication form Print - P Action International conference on silicate binders (ICBM 2021) /20./ Event date 02.12.2021 - 02.12.2021 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CH - Switzerland Keywords Portland-limestone cement ; organic additives ; hydration ; NMR spectroscopy OECD category Materials engineering R&D Projects GC21-35772J GA ČR - Czech Science Foundation (CSF) Institutional support UTAM-F - RVO:68378297 DOI 10.4028/p-73l5m1 Annotation The use of carboxylic acids in mix design alters the hydration process of cement, the resulting pore structure of the obtained cement paste, and, consequently, the mechanical properties of concrete. All these changes are directly related to the structure of the calcium silicate hydrate phase. In the present study, the effect of acetic acid and oxalic acid on the hydration of Portlandlimestone cement was monitored using solid state 29Si NMR spectroscopy. The results showed that
acetic acid facilitated alite and belite hydration, however, the formation of polymerized silicate chains, incorporating Q2p species, begun later than in pure cement paste. Oxalic acid accelerated the polymerization, but slowed down alite and belite hydration. Such behaviors may correspond to decreased porosity (acetic acid addition) and increased strength (oxalic acid addition). Both acids accelerated belite hydration, compared to the pure paste, likely due to an increased acidity of the pore solution. The findings provide structural information about C─S─H phase, to be considered for thaumasite sulfate attack investigations on Portland-limestone cement pastes containing carboxylic acids.Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2023 Electronic address https://doi.org/10.4028/p-73l5m1
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