Complementary experimental study of a normal strength overlay concrete

Drexel, Martin; Smaniotto, Stefan; Hofstetter, Günter

doi:10.1016/j.matpr.2019.03.125

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…A first test is used for calibrating the heat conductivity of the insulation. In this test, a matured specimen, preheated to 47 °normalC, was enclosed in the insulating box, which was then stored in a climatic chamber at 20 °normalC and the temporal decay of temperature was measured [10]. For the numerical simulation of this test, a constant normalized degree of hydration of sans-serifΓ=1 is used.…”

Section: Parameter Identificationmentioning

confidence: 99%

“…In a further test, fresh concrete was cast in the insulated box, which again was stored at the constant ambient temperature of 20 °normalC. The temperature evolution, measured in this test [10], can be used for determining the parameters governing the early-age hydration. In this context, the concrete age is referred to the time t=0 when the water was added during the mixing procedure.…”

Section: Parameter Identificationmentioning

confidence: 99%

“…Plasticizer and air-entraining agents are also included in the mixture to meet the requirements for an overlay concrete concerning frost resistance and flowability. For the respective concrete mixture a comprehensive set of experimental data exists [ 7 , 8 , 9 , 10 ], which will be exploited for calibration. The concrete grade is C30/37 [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Calibration of a Multiphase Model Based on a Comprehensive Data Set for a Normal Strength Concrete

et al. 2019

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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.

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Section: Parameter Identificationmentioning

confidence: 99%

Section: Parameter Identificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Calibration of a Multiphase Model Based on a Comprehensive Data Set for a Normal Strength Concrete

et al. 2019

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“…This calibration is based on a large set of experiments for the concrete mixture summarized in Table 1, including calorimetry tests, tests for age-dependent mechanical properties, tests for determining the hygral properties, different shrinkage tests, as well as compressive creep tests [8,9,10,11]. For this reason, it forms the basis for the developments in the present paper.…”

Section: Introductionmentioning

confidence: 99%

“…These results are not affected by the changes in the model, introduced in the following, and will therefore not be repeated in the present publication. The simulations in the present paper are restricted to experiments on the specific concrete mixture used in [8,9,10,11], because it is the only mixture known to the authors for which a complete set of multiphase-model parameters is available.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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Multiphase modeling of the effect of external loading on the shrinkage of concrete and its consequences for modeling tensile creep

Brugger

Gamnitzer

Hofstetter

2022

Cement and Concrete Composites

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Complementary experimental study of a normal strength overlay concrete

Cited by 5 publications

References 11 publications

Calibration of a Multiphase Model Based on a Comprehensive Data Set for a Normal Strength Concrete

Calibration of a Multiphase Model Based on a Comprehensive Data Set for a Normal Strength Concrete

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

Multiphase modeling of the effect of external loading on the shrinkage of concrete and its consequences for modeling tensile creep

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