Micromechanics-based sensitivity analyses regarding ITZ-induced concrete strength

Author(s): Markus Königsberger, Michal Hlobil, Brice Delsaute, Stéphanie Staquet, Christian Hellmich, Bernhard Pichler
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 1
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
ISBN:978-2-35158-199-5
e-ISBN:978-2-35158-198-8
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 349-354
Total Pages: 6
Language : English

Abstract: 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.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00