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M. Königsberger, T. Honório, J. Sanahuja, B. Delsaute, B. Pichler:
"Homogenization of nonaging basic creep of cementitious materials: A multiscale modeling benchmark";
Construction and Building Materials, 290 (2021), 12 S.

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.

Basic creep; Calcium-Silicate-Hydrate (C-S-H); Cement paste; Concrete; Early-age; Experiments; Micromechanics; Mortar; Viscoelasticity

http://dx.doi.org/10.1016/j.conbuildmat.2021.123144

https://publik.tuwien.ac.at/files/publik_299822.pdf