Počet záznamů: 1
Simulation of thaumasite sulfate attack on Portland cement mixtures using synthesized cement phases
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SYSNO ASEP 0496982 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Simulation of thaumasite sulfate attack on Portland cement mixtures using synthesized cement phases Tvůrce(i) Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAI
Mróz, R. (PL)Celkový počet autorů 2 Číslo článku 04018393 Zdroj.dok. Journal of Materials in Civil Engineering. - : American Society of Civil Engineers - ISSN 0899-1561
Roč. 31, č. 2 (2019)Poč.str. 10 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova sulfate attack ; tricalcium aluminate ; ettringite ; thaumasite ; low temperature Vědní obor RIV JN - Stavebnictví Obor OECD Construction engineering, Municipal and structural engineering CEP LO1219 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Omezený přístup UT WOS 000453216200036 EID SCOPUS 85058236903 DOI 10.1061/(ASCE)MT.1943-5533.0002612 Anotace 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. Pracoviště Ústav teoretické a aplikované mechaniky Kontakt Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Rok sběru 2020 Elektronická adresa https://doi.org/10.1061/(ASCE)MT.1943-5533.0002612
Počet záznamů: 1