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Calibration and Validation of Multi-phase Models for Cementitious and Geological Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Composites".

Deadline for manuscript submissions: closed (22 May 2020) | Viewed by 5501

Special Issue Editors


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Guest Editor
Department of Basic Sciences in Engineering Sciences, Universität Innsbruck, Innsbruck, Austria
Interests: basic and applied research in the fields of Computational and Structural Mechanics; material and geometric nonlinear finite element models; constitutive modelling of concrete, soil and rock; multi-phase formulations in civil engineering

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Guest Editor
Institute for Structural Mechanics, Ruhr-Universität Bochum, Bochum, Germany
Interests: research in theoretical and applied research in computational structural mechanics with emphasis on tunneling and subsurface engineering; model- and data-driven methods for the steering support of construction processes; machine learning methods and uncertainty modeling in engineering; integration of BIM and computational simulation; robust optimization of steel- and fiber-reinforced concrete structures; durability mechanics; life-time analyses of reinforced concrete structures; modeling of excavation and fragmentation processes
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Special Issue Information

Dear Colleagues,

The consideration of interactions between solids and fluids and/or between different physical phenomena, such as thermal, hygral, mechanical, and chemical processes, is essential for an appropriate mathematical description of several problems in civil engineering involving cementitious and geological materials. The latter materials have a certain degree of permeability, allowing liquid or gaseous phases to enter the pore space and to interact with the surrounding solid phase. Since those interactions between different phases may strongly influence the structural behaviour, they have to be taken into account in numerical models.

On the one hand, multi-phase models are a powerful approach for considering different interacting physical phenomena. On the other hand, they require the determination of a large number of material parameters from a broad range of different, and often elaborate, experiments. Hence, the calibration and validation of multi-phase models are challenging tasks, and frequently for a given problem only some of the material parameters are calibrated from tests whereas others are taken from the literature without a specific relation to the actual problem or material. Besides consistent testing procedures, micromechanics-oriented models are helpful to obtain required macroscopic constitutive relations, which are inherently dependent on the specific microstructure of the porous material.

It is the aim of the present Special Issue to improve this unsatisfactory situation by placing a clear focus on the calibration and validation of multi-phase models for Cementitious and Geological Materials.

Prof. Dr. Günter Hofstetter
Prof. Dr. Günther Meschke
Guest Editors

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Keywords

  • multi-phase models
  • micromechanics-based models
  • numerical models
  • cementitious materials
  • geological materials
  • validation
  • calibration

Published Papers (2 papers)

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Research

23 pages, 505 KiB  
Article
Modelling of Coupled Shrinkage and Creep in Multiphase Formulations for Hardening Concrete
by Peter Gamnitzer, Andreas Brugger, Martin Drexel and Günter Hofstetter
Materials 2019, 12(11), 1745; https://0-doi-org.brum.beds.ac.uk/10.3390/ma12111745 - 29 May 2019
Cited by 7 | Viewed by 2304
Abstract
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 [...] Read more.
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. Full article
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23 pages, 750 KiB  
Article
Calibration of a Multiphase Model Based on a Comprehensive Data Set for a Normal Strength Concrete
by Peter Gamnitzer, Martin Drexel, Andreas Brugger and Günter Hofstetter
Materials 2019, 12(5), 791; https://0-doi-org.brum.beds.ac.uk/10.3390/ma12050791 - 07 Mar 2019
Cited by 9 | Viewed by 2698
Abstract
Hygro-thermo-chemo-mechanical modelling of time-dependent concrete behavior requires the accurate determination of a large set of parameters. In this paper, the parameters of a multiphase model are calibrated based on a comprehensive set of experiments for a particular concrete of grade C30/37. The experiments [...] Read more.
Hygro-thermo-chemo-mechanical modelling of time-dependent concrete behavior requires the accurate determination of a large set of parameters. In this paper, the parameters of a multiphase model are calibrated based on a comprehensive set of experiments for a particular concrete of grade C30/37. The experiments include a calorimetry test, tests for age-dependent mechanical properties, tests for determining the water desorption isotherm, shrinkage tests, and compressive creep tests. The latter two were performed on sealed and unsealed specimens with accompanying mass water content measurements. The multiphase model is based on an effective stress formulation. It features a porosity-dependent desorption isotherm, taking into account the time-dependency of the desorption properties. The multiphase model is shown to yield excellent results for the evolutions of the mechanical parameters. The evolution of the autogenous shrinkage strain and evolutions of the creep compliances for loading at concrete ages of 2 days, 7 days, and 28 days are well predicted together with the respective mass water content evolution. This also holds for the evolution of the drying shrinkage strain, at least for moderate drying up to one year. However, it will be demonstrated that for longer drying times further conceptual thoughts concerning the coupled representation of shrinkage and creep are required. Full article
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