29Si NMR investigation of the effect of acetic and oxalic acids on Portland-limestone cement hydration
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F22%3A00563761" target="_blank" >RIV/68378297:_____/22:00563761 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.4028/p-73l5m1" target="_blank" >https://doi.org/10.4028/p-73l5m1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.4028/p-73l5m1" target="_blank" >10.4028/p-73l5m1</a>
Alternative languages
Result language
angličtina
Original language name
29Si NMR investigation of the effect of acetic and oxalic acids on Portland-limestone cement hydration
Original language description
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 thatnacetic 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.
Czech name
—
Czech description
—
Classification
Type
D - Article in proceedings
CEP classification
—
OECD FORD branch
20501 - Materials engineering
Result continuities
Project
<a href="/en/project/GC21-35772J" target="_blank" >GC21-35772J: Microstructural changes in Portland-limestone cement pastes under the combined effect of sulfate and chloride ions</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Materials Science Forum
ISBN
978-3-0364-0186-7
ISSN
1662-9752
e-ISSN
—
Number of pages
6
Pages from-to
247-252
Publisher name
Trans Tech Publications
Place of publication
Baech
Event location
Brno
Event date
Dec 2, 2021
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
—