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Hydrate failure in ITZ governs concrete strength: A micro-to-macro validated engineering mechanics model
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SYSNO ASEP 0482301 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Hydrate failure in ITZ governs concrete strength: A micro-to-macro validated engineering mechanics model Author(s) Königsberger, M. (AT)
Hlobil, Michal (UTAM-F) RID, SAI, ORCID
Delsaute, B. (BZ)
Staquet, S. (BE)
Hellmich, C. (AT)
Pichler, B. (AT)Number of authors 6 Source Title Cement and Concrete Research. - : Elsevier - ISSN 0008-8846
Roč. 103, č. 1 (2018), s. 77-94Number of pages 18 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords compressive strength ; micromechanics ; cement paste ; concrete ; modeling Subject RIV JM - Building Engineering OECD category Construction engineering, Municipal and structural engineering Institutional support UTAM-F - RVO:68378297 UT WOS 000423245700006 EID SCOPUS 85033576675 DOI 10.1016/j.cemconres.2017.10.002 Annotation Ever since the early days of Féret (1892) and Abrams (1919), concrete research has targeted at relating concrete composition to uniaxial compressive strength. While these activities were mainly characterized by empirical fitting functions, we here take a more fundamental approach based on continuum micromechanics. The loading applied at the concrete level, is first concentrated (“downscaled”) to maximum stresses related to cement paste volumes which are directly adjacent to the aggregates, i.e. to the interfacial transition zones (ITZ). These maximum stresses are further “downscaled” to the micron-sized hydrates, in terms of higher-order stress averages. The latter enter a Drucker-Prager failure criterion with material constants derived from nanoindentation tests. The model is successfully validated across the hydrate-to-concrete scales. Strength magnitude is governed by ITZ stress concentrations, and the water-to-cement ratio is its dominant mixture design parameter. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2019 Electronic address https://doi.org/10.1016/j.cemconres.2017.10.002
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