TY - JOUR
T1 - Multi-scale strategy to estimate the mechanical and diffusive properties of cementitious materials prepared with CEM II/CM
AU - Gu, Yushan
AU - Bary, Benoît
AU - Machner, Alisa
AU - De Weerdt, Klaartje
AU - Bolte, Gerd
AU - Ben Haha, Mohsen
N1 - Funding Information:
This project has received funding from the European Union under the research and innovation program Horizon 2020 , grant agreement No 760639 . This publication reflects only the authors' view and the Commission is not responsible for any use that may be made of the information it contains. We would like to express our gratitude to Barbara Lothenbach (Empa/NTNU) for the fruitful discussion concerning thermodynamic modeling. We are also indebted to Aljoša Šajna (ZAG) and Lucija Hanžič (ZAG) for the discussions to which they participated and for their continuous support of this project.
Funding Information:
This project has received funding from the European Union under the research and innovation program Horizon 2020, grant agreement No 760639. This publication reflects only the authors' view and the Commission is not responsible for any use that may be made of the information it contains. We would like to express our gratitude to Barbara Lothenbach (Empa/NTNU) for the fruitful discussion concerning thermodynamic modeling. We are also indebted to Aljoša Šajna (ZAG) and Lucija Hanžič (ZAG) for the discussions to which they participated and for their continuous support of this project.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/8
Y1 - 2022/8
N2 - A procedure to estimate the mechanical and diffusive properties of cement pastes, mortars and concretes made with a novel CEM II/C-M (S-LL) binder that has been developed within the European EnDurCrete project, is presented in this paper. The objective is to set up a strategy able to determine the materials composition at different scales and in various configurations, and to provide reliable estimates of the properties. The phase assemblages of the cement pastes upon hydration, and further exposed to carbonation, leaching with water or chloride containing solutions, are first simulated using thermodynamic modeling. Different homogenization schemes are then applied, to estimate the mechanical and diffusive properties of the hydrated and degraded materials at different scales. The interfacial transition zone (ITZ) in mortar and concrete is accounted for by means of specific hypotheses regarding its thickness and the respective volume fraction of hydrates and capillary pores. The application of the differential scheme (DIF) at the cement paste scale, and at higher scales of the generalized self-consistent scheme (GSCS) or a procedure accounting for ITZ modeled as an interface combined with the DIF scheme, show a good consistency with the measured Young's modulus. In parallel, simulations are performed on 3D specimens composed of spherical particles surrounded by an ITZ layer to provide additional data for comparison. Numerical results and analytical estimations are found to be in excellent agreement. Finally, a specific study focusing on the effects of the ITZ on both mechanical and diffusive properties shows a significant impact of its thickness and its composition.
AB - A procedure to estimate the mechanical and diffusive properties of cement pastes, mortars and concretes made with a novel CEM II/C-M (S-LL) binder that has been developed within the European EnDurCrete project, is presented in this paper. The objective is to set up a strategy able to determine the materials composition at different scales and in various configurations, and to provide reliable estimates of the properties. The phase assemblages of the cement pastes upon hydration, and further exposed to carbonation, leaching with water or chloride containing solutions, are first simulated using thermodynamic modeling. Different homogenization schemes are then applied, to estimate the mechanical and diffusive properties of the hydrated and degraded materials at different scales. The interfacial transition zone (ITZ) in mortar and concrete is accounted for by means of specific hypotheses regarding its thickness and the respective volume fraction of hydrates and capillary pores. The application of the differential scheme (DIF) at the cement paste scale, and at higher scales of the generalized self-consistent scheme (GSCS) or a procedure accounting for ITZ modeled as an interface combined with the DIF scheme, show a good consistency with the measured Young's modulus. In parallel, simulations are performed on 3D specimens composed of spherical particles surrounded by an ITZ layer to provide additional data for comparison. Numerical results and analytical estimations are found to be in excellent agreement. Finally, a specific study focusing on the effects of the ITZ on both mechanical and diffusive properties shows a significant impact of its thickness and its composition.
KW - 3D computational analysis
KW - Interfacial transition zone (ITZ)
KW - Mechanical and diffusive properties
KW - Multi-scale modeling
KW - Novel cementitious material
KW - Thermodynamic modeling
UR - http://www.scopus.com/inward/record.url?scp=85130180658&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2022.104537
DO - 10.1016/j.cemconcomp.2022.104537
M3 - Article
SN - 0958-9465
VL - 131
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 104537
ER -