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Long-term creep deformations in colloidal calcium–silicate–hydrate gels by accelerated aging simulations

Liu, H., Dong, S., Tang, L., Anoop Krishnan, N.M., Masoero, E., Sant, G. and Bauchy, M. 2019. Long-term creep deformations in colloidal calcium–silicate–hydrate gels by accelerated aging simulations. Journal of Colloid and Interface Science 542 , pp. 339-346. 10.1016/j.jcis.2019.02.022

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When subjected to a sustained load, jammed colloidal gels can feature some delayed viscoplastic creep deformations. However, due to the long timescale of creep (up to several years), its modeling and, thereby, prediction has remained challenging. Here, based on mesoscale simulations of calcium–silicate–hydrate gels (Csingle bondSsingle bondH, the binding phase of concrete), we present an accelerated simulation method—based on stress perturbations and overaging—to model creep deformations in Csingle bondSsingle bondH. Our simulations yield a very good agreement with nanoindentation creep tests, which suggests that concrete creep occurs through the reorganization of Csingle bondSsingle bondH grains at the mesoscale. We show that the creep of Csingle bondSsingle bondH exhibits a logarithmic dependence on time—in agreement with the free-volume theory of granular physics. Further, we demonstrate the existence of a linear regime, i.e., wherein creep linearly depends on the applied load—which establishes the creep modulus as a material constant. These results could offer a new physics-based basis for nanoengineering colloidal gels featuring minimal creep.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0021-9797
Date of Acceptance: 6 February 2019
Last Modified: 28 Oct 2021 16:00

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