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Effect of cyclic wetting and drying on microstructure, composition and length changes of lime-based plasters
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SYSNO ASEP 0508679 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of cyclic wetting and drying on microstructure, composition and length changes of lime-based plasters Author(s) Jerman, M. (CZ)
Scheinherrová, L. (CZ)
Medveď, I. (CZ)
Krejsová, J. (CZ)
Doleželová, M. (CZ)
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Černý, R. (CZ)Number of authors 7 Article number 103411 Source Title Cement and Concrete Composites. - : Elsevier - ISSN 0958-9465
Roč. 104, NOV (2019)Number of pages 11 s. Language eng - English Country GB - United Kingdom Keywords Composition ; Drying ; Length changes ; Lime plasters ; Microstructure ; Wetting Subject RIV CA - Inorganic Chemistry OECD category Inorganic and nuclear chemistry Method of publishing Limited access Institutional support UACH-T - RVO:61388980 UT WOS 000501649500073 EID SCOPUS 85071874804 DOI 10.1016/j.cemconcomp.2019.103411 Annotation Plasters as surface layers of building structures are often exposed to cyclic wetting and drying during their service life. In this paper, the impact of cyclic wetting and drying on microstructure, composition, and length changes of lime-based plasters is investigated using mercury intrusion porosimetry, optical microscopy, qualitative and quantitative X-ray diffraction analysis, simultaneous thermal analysis, and contact dilatometry. Lime-cement- and lime-metakaolin plasters as typical representatives of this group are saturated by water at first and then subjected to five consecutive drying-wetting cycles. Hydration processes, together with carbonation and possible partial dissolution of portlandite and calcite after immersion of samples in water, are identified as the most important reactions affecting the microstructure and composition of the lime-cement plaster, while for the lime-metakaolin plaster the pozzolanic reaction resulting in monocarbonate production, together with possible portlandite and calcite dissolution, are probably the most significant factors. The measurements of hygric strain show that the wetting-drying process is near-reversible since the beginning of the second cycle, whereas capillary pressure is the dominant shrinkage/swelling mechanism. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2020 Electronic address http://hdl.handle.net/11104/0299516
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