Počet záznamů: 1
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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název 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 Tvůrce(i) Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAI
Mróz, R. (PL)
Mácová, Petra (UTAM-F) RID, SAI, ORCID
Mazur, A. S. (RU)
Krajnc, A. (SI)Celkový počet autorů 5 Číslo článku 106902 Zdroj.dok. Cement and Concrete Research. - : Elsevier - ISSN 0008-8846
Roč. 160, October (2022)Poč.str. 14 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova sulfate resistance ; aluminate phases ; carbonation ; solid-state NMR spectroscopy ; EPR spectroscopy Obor OECD Materials engineering CEP GJ18-26056Y GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora UTAM-F - RVO:68378297 UT WOS 000879907600004 EID SCOPUS 85134800286 DOI 10.1016/j.cemconres.2022.106902 Anotace 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. Pracoviště Ústav teoretické a aplikované mechaniky Kontakt Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Rok sběru 2023 Elektronická adresa https://doi.org/10.1016/j.cemconres.2022.106902
Počet záznamů: 1