Micromechanics-based sensitivity analyses regarding ITZ-induced concrete strength

0479192 - ÚTAM 2018 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Königsberger, M. - Hlobil, Michal - Delsaute, B. - Staquet, S. - Hellmich, Ch. - Pichler, B.
Micromechanics-based sensitivity analyses regarding ITZ-induced concrete strength.
Proceedings of the 2nd International RILEM/COST conference on Early age cracking and serviceability in cement-based materials and structures - EAC2.. Vol. 1. Paris: RILEM Publications S.A.R.L., 2017 - (Staquet, S.; Agellis, D.). RILEM Proceedings PRO, 120. ISBN 978-2-35158-199-5.
[International RILEM/COST conference on Early age cracking and serviceability in cement-based materials and structures - EAC-02 /2./. Brusel (BE), 12.09.2017-14.09.2017]
Institucionální podpora: RVO:68378297
Klíčová slova: multiscale modelling * micromechanics * early age * uniaxial compressive strength
Obor OECD: Construction engineering, Municipal and structural engineering

Based on a continuum micromechanics approach, we model the evolution of the uniaxial compressive strength of cementitious materials during early material ages. Three observation scales are introduced, namely concrete, cement paste, and hydrate foam (comprising capillary porosity and needle-shaped hydrates). The loading applied at the concrete level is first concentrated to the interfacial transition zones (ITZs) surrounding the aggregates and then further concentrated to the micron-sized hydrates, where failure is modelled according to a Mohr-Coulomb criterion. After successful model validation against independent strength experiments, we study the sensitivity of the strength with respect to changes in the concrete mix design.
Trvalý link: http://hdl.handle.net/11104/0275205