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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