Long-term thaumasite sulfate attack on Portland-limestone cement concrete: A multi-technique approach for assessing phase assemblage

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F20%3A00510233" target="_blank" >RIV/68378297:_____/20:00510233 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.cemconres.2020.105995" target="_blank" >https://doi.org/10.1016/j.cemconres.2020.105995</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cemconres.2020.105995" target="_blank" >10.1016/j.cemconres.2020.105995</a>

Result language
angličtina
Original language name
Long-term thaumasite sulfate attack on Portland-limestone cement concrete: A multi-technique approach for assessing phase assemblage
Original language description
Multiple techniques were applied to the investigation of the phase composition of the deteriorated surface of Portland-limestone cement concrete specimens exposed for 10 years to conditions promoting thaumasite sulfate attack. The results were interpreted in terms of the limestone content of cement and the incorporation of supplementary cementitious materials (SCMs) (natural pozzolana, blastfurnace slag, metakaolin). Thaumasite, detected in high amounts in concrete specimens made without SCMs, was associated with Al to some extent. Considerable degradation of calcium silicate hydrate occurred in all specimens, resulting in the formation of Alassociated cross-linked silicate chains, magnesium silicate hydrate and silica gel, a process most effectively prevented by metakaolin. For the highest limestone content in cement or use of natural pozzolana, thaumasite underwent extensive decomposition. Al incorporation into cross-linked silicate chains increased with increasing limestone content in cement. Longer aluminosilicate chains with larger Al fractions were observed in concrete specimens incorporating SCMs.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering

Project
<a href="/en/project/GJ18-26056Y" target="_blank" >GJ18-26056Y: Experimental quantification and modelling of deterioration in Portland-limestone cement pastes affected by thaumasite sulfate attack</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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