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Homogenization of nonaging basic creep of cementitious materials: A multiscale modeling benchmark
Highlights Three micromechanics creep models are applied in a modeling benchmark. Macroscopic creep results from intrinsic creep of microscopic C-S-H. Considering non-spherical shapes for C-S-H hydrates improves model performance. Separating instantaneous from time-dependent strains in experiments is essential.
Abstract This paper presents the results of a European benchmark on multiscale creep modeling for cementitious materials, performed in the framework of the COST Action TU1404 “Towards the next generation of standards for service life of cement-based materials and structures”. Three micromechanical models from three research groups have been adopted for modeling the basic non-aging creep of cementitious materials. The benchmark is based on the hypotheses that creep results only from calcium-silicate-hydrates (C-S-H) and that viscoelastic behavior of all microstructural constituents is maturity- and composition-independent. By comparing model results among themselves as well as by comparing model predictions with experimental results obtained from three different laboratories, we demonstrate that creep upscaling from micrometer-sized C-S-H to centimeter-sized macroscopic samples of cement paste, mortar, and concrete, and from minutes-long creep tests at early ages to days-long creep tests at very mature ages is indeed possible. The benchmark also highlights the importance of considering micro-anisotropy of C-S-H in terms of non-spherical shapes for C-S-H hydrates.
Homogenization of nonaging basic creep of cementitious materials: A multiscale modeling benchmark
Highlights Three micromechanics creep models are applied in a modeling benchmark. Macroscopic creep results from intrinsic creep of microscopic C-S-H. Considering non-spherical shapes for C-S-H hydrates improves model performance. Separating instantaneous from time-dependent strains in experiments is essential.
Abstract This paper presents the results of a European benchmark on multiscale creep modeling for cementitious materials, performed in the framework of the COST Action TU1404 “Towards the next generation of standards for service life of cement-based materials and structures”. Three micromechanical models from three research groups have been adopted for modeling the basic non-aging creep of cementitious materials. The benchmark is based on the hypotheses that creep results only from calcium-silicate-hydrates (C-S-H) and that viscoelastic behavior of all microstructural constituents is maturity- and composition-independent. By comparing model results among themselves as well as by comparing model predictions with experimental results obtained from three different laboratories, we demonstrate that creep upscaling from micrometer-sized C-S-H to centimeter-sized macroscopic samples of cement paste, mortar, and concrete, and from minutes-long creep tests at early ages to days-long creep tests at very mature ages is indeed possible. The benchmark also highlights the importance of considering micro-anisotropy of C-S-H in terms of non-spherical shapes for C-S-H hydrates.
Homogenization of nonaging basic creep of cementitious materials: A multiscale modeling benchmark
Königsberger, Markus (author) / Honório, Túlio (author) / Sanahuja, Julien (author) / Delsaute, Brice (author) / Pichler, Bernhard L.A. (author)
2021-03-20
Article (Journal)
Electronic Resource
English
Multiscale continuum mechanics of cementitious materials: Creep and strength
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