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Microstructure investigation of the interface between lightweight concrete and normal-weight concrete
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SYSNO ASEP 0508338 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Microstructure investigation of the interface between lightweight concrete and normal-weight concrete Author(s) Huang, H. (CN)
Yuan, Y. (CN)
Zhang, Wei (UTAM-F) RID, ORCID, SAI
Liu, B. (CN)
Viani, Alberto (UTAM-F) RID, ORCID, SAI
Mácová, Petra (UTAM-F) RID, SAI, ORCIDNumber of authors 6 Article number 100640 Source Title Materials Today Communications. - : Elsevier - ISSN 2352-4928
Roč. 21, December (2019)Number of pages 7 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords interfacial transition zone ; lightweight concrete ; micro-hardness test ; scanning electron microscope ; Raman spectroscopy Subject RIV JN - Civil Engineering OECD category Materials engineering Method of publishing Limited access Institutional support UTAM-F - RVO:68378297 UT WOS 000504839500093 EID SCOPUS 85072166162 DOI 10.1016/j.mtcomm.2019.100640 Annotation Lightweight concrete (LWC) and normal weight concrete (NWC) are used in combination in structural engineering practice. Introduction of LWC brings advantages in terms of energy efficiency and reduction of costs. The mechanical properties of the interfacial transition zone (ITZ) between LWC and NWC has a crucial effect on the durability of structures. In this study, the bond properties of normal weight concrete-to-lightweight concrete (NWC-to-LWC) and lightweight aggregates-tocement paste (LWA-to-CP) have been investigated at the microscale conducting microhardness tests and scanning electron microscope observations, whereas phase composition at the ITZ was measured with micro-Raman spectroscopy. The results indicated that the micro-hardness profile across the NWC-to-LWC ITZ is 'U-shaped' and is surrounded by many fine cracks. The minimum in micro-hardness corresponds to a higher concentration of hydration products and ettringite. The LWA-to-CP ITZ is narrower, it appears compact with an asymmetric micro-hardness profile, thicker on the side of the cement paste (about 50 μm). On this side, a weak zone, with hardness lower than the one of the cement paste and enriched in ettringite and carbonated Ca(OH)2, is observed. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2020 Electronic address https://doi.org/10.1016/j.mtcomm.2019.100640
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