Multi-decade, multi-scale modeling of aging basic creep of concrete

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Abstract

This study presents a multi-scale model for predicting multi-decade basic creep of concrete. Aging of cement is modeled through hydration, densification, and polymerization of the calcium-silicate-hydrate (C-S-H) phases. The model accounts for the separate mechanisms of viscoelastic compliance and aging viscous flow of the C-S-H, and for the dissolution-precipitation of elastic and viscoelastic phases during hydration that causes apparent creep in the composite. Upscaling is performed in the time-domain simultaneously for all loading ages. The results show that short-term viscoelastic compliance observed from nanoindentation tests dominates short-term creep, but cannot explain long-term creep rates observed in macroscopic concrete creep tests. Such observations can only be replicated by considering viscous flow that develops over time scales unobservable by minutes-long tests on the microscale. Dissolution creep may explain some irreversible basic creep at very early ages but rapidly diminishes in relevance as the concrete continues to age.

Original languageEnglish (US)
Pages (from-to)17-27
Number of pages11
JournalACI Materials Journal
Volume117
Issue number6
DOIs
StatePublished - Nov 1 2020

Bibliographical note

Publisher Copyright:
© 2020 American Concrete Institute. All rights reserved.

Keywords

  • Creep
  • Dissolution precipitation
  • Hydration
  • Multi-scale modeling

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