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Quantification of microstructural changes in limestone cement paste stored in sulfate environment at low temperature
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SYSNO ASEP 0532112 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Quantification of microstructural changes in limestone cement paste stored in sulfate environment at low temperature Author(s) Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAI
Hlobil, Michal (UTAM-F) RID, SAI, ORCID
Machová, Dita (UTAM-F) RID, ORCID, SAI
Mácová, Petra (UTAM-F) RID, SAI, ORCID
Viani, Alberto (UTAM-F) RID, ORCID, SAI
Vopálenský, Michal (UTAM-F) RID, ORCID, SAINumber of authors 6 Source Title Solid State Phenomena, 26th International Conference Concrete Days, 309. - Baech : Trans Tech Publications, 2020 / Nenadálová Š. ; Johová P. - ISSN 1012-0394 - ISBN 978-3-0357-1668-9 Pages s. 3-7 Number of pages 5 s. Publication form Print - P Action International Conference Concrete Days /26./ Event date 20.11.2019 - 21.11.2019 VEvent location Hradec Králové Country CZ - Czech Republic Event type EUR Language eng - English Country CH - Switzerland Keywords limestone cement ; sulfates ; microstructure ; X-ray tomography Subject RIV JN - Civil Engineering OECD category Materials engineering R&D Projects GJ18-26056Y GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UTAM-F - RVO:68378297 EID SCOPUS 85090294025 DOI 10.4028/www.scientific.net/SSP.309.3 Annotation Portland-limestone cement paste specimens were stored in magnesium sulfate solution at 5°C for 6 months, the occurring microstructural changes have been monitored on a monthly basis. Extent of deterioration was quantitatively assessed with different techniques. The X-ray microcomputed tomography was employed to describe non-invasively the pore structure and extend of deterioration. X-ray powder diffraction and infrared spectroscopy were used to characterize the phase changes occurred in the course of the sulfate attack. Compressive strength tests reflected the effect of the process on mechanical performance. The results indicate the rapid degradation of the system, owing, mainly, to crack formation, expansion, and finally loss of cohesion between the deteriorated parts of the specimens and the sound cement matrix, as a consequence of the formation of new phases. The progress of an irregular deterioration front was observed. The presence of complex phases (thaumasite, ettringite) was proved, however, the deteriorated parts of the specimens mostly consisted of gypsum. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2021 Electronic address https://doi.org/10.4028/www.scientific.net/SSP.309.3
Number of the records: 1