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Simulation of thaumasite sulfate attack on Portland cement mixtures using synthesized cement phases
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SYSNO ASEP 0496982 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Simulation of thaumasite sulfate attack on Portland cement mixtures using synthesized cement phases Author(s) Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAI
Mróz, R. (PL)Number of authors 2 Article number 04018393 Source Title Journal of Materials in Civil Engineering. - : American Society of Civil Engineers - ISSN 0899-1561
Roč. 31, č. 2 (2019)Number of pages 10 s. Publication form Print - P Language eng - English Country US - United States Keywords sulfate attack ; tricalcium aluminate ; ettringite ; thaumasite ; low temperature Subject RIV JN - Civil Engineering OECD category Construction engineering, Municipal and structural engineering R&D Projects LO1219 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access UT WOS 000453216200036 EID SCOPUS 85058236903 DOI 10.1061/(ASCE)MT.1943-5533.0002612 Annotation In this work, a simulation of thaumasite sulfate attack on portland cement mixtures was performed, using synthesized cement phases. Three model systems containing C3S, C3A, and alkali sulfate (CaSO4, Na2SO4, and K2SO4, respectively) and a fourth one consisting of ettringite and C−S−H, were designed, and several mixtures were prepared. Ca(OH)2 and CaCO3 were optionally added. Specimens stored at 5°C and 20°C in an atmosphere saturated in water vapor for 75 months were investigated with X-ray diffraction analysis and scanning electron microscopy. Thaumasite formed in all samples without C3A at 5°C, and at 20°C when sulfates were derived from CaSO4. Solid solution of thaumasite and ettringitewas detected in samples incorporating C3A and CaSO4 or Na2SO4 at 5°C. This was also observed at 20°C when CaSO4 was the source of sulfates, whereas ettringite formed in the case of Na2SO4. The absence of thaumasite and ettringite in specimens containing C3A and K2SO4 was attributed to the alkali carbonation process. In the fourth system, decomposition of ettringite occurred in the specimens exempt of Ca(OH)2. The work is supposed to contribute to understanding the primary causes of concrete damage when the concrete is subjected to long-term sulfate attack. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2020 Electronic address https://doi.org/10.1061/(ASCE)MT.1943-5533.0002612
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