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Long-term sulfate resistance of synthesized cement systems with variable C₃A/C₄AF ratio at low temperature or ambient conditions: Insights into the crystalline and amorphous phase assemblage
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SYSNO ASEP 0559240 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Long-term sulfate resistance of synthesized cement systems with variable C₃A/C₄AF ratio at low temperature or ambient conditions: Insights into the crystalline and amorphous phase assemblage Author(s) Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAI
Mróz, R. (PL)
Mácová, Petra (UTAM-F) RID, SAI, ORCID
Mazur, A. S. (RU)
Krajnc, A. (SI)Number of authors 5 Article number 106902 Source Title Cement and Concrete Research. - : Elsevier - ISSN 0008-8846
Roč. 160, October (2022)Number of pages 14 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords sulfate resistance ; aluminate phases ; carbonation ; solid-state NMR spectroscopy ; EPR spectroscopy OECD category Materials engineering R&D Projects GJ18-26056Y GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UTAM-F - RVO:68378297 UT WOS 000879907600004 EID SCOPUS 85134800286 DOI 10.1016/j.cemconres.2022.106902 Annotation Synthesized cement systems made with variable C₃A/C₄AF ratios, containing C₃S, gypsum and, optionally, calcite, were stored long-term at humid conditions at 5 or 20 °C, without any protection against atmospheric carbonation. Analytical techniques able to assess both the crystalline and amorphous phases were used. Experimental results were compared with thermodynamic simulations. The systems with C₃A/C₄AF < 1 better preserved the soundness of the C–S–H phase, which hosted iron, and prevented thaumasite formation. The addition of calcite in these systems inhibited carbonation. When occurred (mixtures without calcite), the carbonation was significantly more intense at ambient temperature. In the systems that underwent extensive deterioration, cross-linking of silicate structures, AFt decomposition, and iron release from the deteriorating C–S–H, occurred, while Al-incorporating amorphous silica, calcium carbonate polymorphs and hydrous iron oxide formed. The presence of unreacted C₃A in the systems with C₃A/C₄AF = 1, suggested that C–S–H decomposition was contributed by available sulfates. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2023 Electronic address https://doi.org/10.1016/j.cemconres.2022.106902
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