Počet záznamů: 1
29Si NMR investigation of the effect of acetic and oxalic acids on Portland-limestone cement hydration
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SYSNO ASEP 0563761 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název 29Si NMR investigation of the effect of acetic and oxalic acids on Portland-limestone cement hydration Tvůrce(i) Mazur, A. (RU)
Tolstoy, P. M. (RU)
Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAICelkový počet autorů 3 Zdroj.dok. 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 Rozsah stran s. 247-252 Poč.str. 6 s. Forma vydání Tištěná - P Akce International conference on silicate binders (ICBM 2021) /20./ Datum konání 02.12.2021 - 02.12.2021 Místo konání Brno Země CZ - Česká republika Typ akce WRD Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova Portland-limestone cement ; organic additives ; hydration ; NMR spectroscopy Obor OECD Materials engineering CEP GC21-35772J GA ČR - Grantová agentura ČR Institucionální podpora UTAM-F - RVO:68378297 DOI 10.4028/p-73l5m1 Anotace 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.Pracoviště Ústav teoretické a aplikované mechaniky Kontakt Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Rok sběru 2023 Elektronická adresa https://doi.org/10.4028/p-73l5m1
Počet záznamů: 1