Next Article in Journal
Effect of Crystallinity of Polyethylene with Different Densities on Breakdown Strength and Conductance Property
Previous Article in Journal
Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film
Previous Article in Special Issue
Calibration of a Multiphase Model Based on a Comprehensive Data Set for a Normal Strength Concrete
Open AccessArticle

Modelling of Coupled Shrinkage and Creep in Multiphase Formulations for Hardening Concrete

Unit of Strength of Materials and Structural Analysis, Institute of Basic Sciences in Engineering Sciences, Innsbruck University, Technikerstr. 13, A-6020 Innsbruck, Austria
*
Author to whom correspondence should be addressed.
Materials 2019, 12(11), 1745; https://doi.org/10.3390/ma12111745
Received: 3 May 2019 / Revised: 23 May 2019 / Accepted: 24 May 2019 / Published: 29 May 2019
The durability and serviceability of concrete structures is influenced by both the early-age behavior of concrete as well as its long-term response in terms of shrinkage and creep. Hygro-thermo-chemo-mechanical models, as they are used in the present publication, offer the possibility to consistently model the behavior of concrete from the first hours to several years. However, shortcomings of the formulation based on effective stress, which is usually employed in such multiphase models, were identified. As a remedy, two alternative formulations with a different coupling of shrinkage and creep are proposed in the present publication. Both assume viscous flow creep to be driven by total stress instead of effective stress, while viscoelastic creep is driven either by total or effective stress. Therefore, in contrast to the formulation based on effective stress, they predict a limit value for shrinkage as observed in long-term drying shrinkage tests. Shrinkage parameters for the new formulations are calibrated based on drying shrinkage data obtained from thin slices. The calibration process is straightforward for the new formulations since they decouple shrinkage and viscous flow creep. The different formulations are compared using results from shrinkage tests on sealed and unsealed cylindrical specimens. Shrinkage strain predictions are significantly improved by the new formulations. View Full-Text
Keywords: hardening concrete; hygro-thermo-chemo-mechanical modelling; shrinkage; creep hardening concrete; hygro-thermo-chemo-mechanical modelling; shrinkage; creep
Show Figures

Figure 1

MDPI and ACS Style

Gamnitzer, P.; Brugger, A.; Drexel, M.; Hofstetter, G. Modelling of Coupled Shrinkage and Creep in Multiphase Formulations for Hardening Concrete. Materials 2019, 12, 1745.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop