Microprestress-solidification theory: Modeling of size effect on drying creep

Zdenek P Bazant, P. Havlásek, M. Jirásek

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

The microprestress-solidification theory of concrete creep is first recast in a different but equivalent format, which permits elimination of one model parameter without affecting generality of the model and can serve as the basis of an efficient numerical method. The mechanical model is then combined with a moisture transport model and used in finite element simulations of shrinkage and creep of slabs and prisms. Comparison to experimental data reveals that the model can provide good fits of some of thecreep curves from the literature but fails to properly reproduce the experimentally observed size effect on drying creep. The main reason is that the originally postulated equation for microprestress relaxation is too simple and does not cover a full spectrum of relaxation times. This leads to a delay between the humidity changes and the resulting increase of viscosity that contributes to drying creep. A modification which takes into account the instantaneous effects on viscosity by an additional viscousdashpot is outlined and the resulting improvement of the model performance is demonstrated.

Original languageEnglish (US)
Title of host publicationComputational Modelling of Concrete Structures - Proceedings of EURO-C 2014
Pages749-758
Number of pages10
Volume2
StatePublished - Mar 5 2014
EventEURO-C 2014 Conference - St. Anton am Arlberg, Austria
Duration: Mar 24 2014Mar 27 2014

Other

OtherEURO-C 2014 Conference
CountryAustria
CitySt. Anton am Arlberg
Period3/24/143/27/14

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Modeling and Simulation

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    Bazant, Z. P., Havlásek, P., & Jirásek, M. (2014). Microprestress-solidification theory: Modeling of size effect on drying creep. In Computational Modelling of Concrete Structures - Proceedings of EURO-C 2014 (Vol. 2, pp. 749-758)