A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Constitutive model for aging thermoviscoelasticity of reacting concrete II: Results and discussion
In this Part of the Paper, theoretical predictions of the proposed constitutive model for creep, recovery and relaxation of hydrating and reacting concretes at different constant temperatures have been empirically validated, albeit separately for each case. Practical relevance of the work done for creep and durability design of concrete structures as well as for experimental methodology has been discussed. To reiterate, two expressions for the material viscosity tensor have been derived and a new Unified Constitutive Model has been proposed for aging thermochemoviscoelasticity of concrete. The proposed model has been validated and has some practical relevance for design of concrete structures. The scope of the proposed model is restricted to constant ambient temperature. The model can be generalized by incorporating the effect of variable temperature history on long-term material behaviour. It must be appreciated that concrete is not a single material, but rather a continuum of materials each with different values of chemo-mechanical parameters. Such is the case because of the fact the volumetric fractions of its constituent phases vary with type of cement, concrete grade, age, reacting chemicals, temperature history, presence of some accelerator or retarder, etc. In this Paper, empirical calibration and validation of the proposed model has been attempted separately for the cases of hydrating and leaching concrete of different grades and under different constant ambient temperatures. For obtaining the unique values of the material parameters for different reacting concretes, it is obviously necessary to undertake experimental investigations on their long-term deformations. Only then can the proposed constitutive model be properly calibrated and validated to command the confidence of its intended users.
Constitutive model for aging thermoviscoelasticity of reacting concrete II: Results and discussion
In this Part of the Paper, theoretical predictions of the proposed constitutive model for creep, recovery and relaxation of hydrating and reacting concretes at different constant temperatures have been empirically validated, albeit separately for each case. Practical relevance of the work done for creep and durability design of concrete structures as well as for experimental methodology has been discussed. To reiterate, two expressions for the material viscosity tensor have been derived and a new Unified Constitutive Model has been proposed for aging thermochemoviscoelasticity of concrete. The proposed model has been validated and has some practical relevance for design of concrete structures. The scope of the proposed model is restricted to constant ambient temperature. The model can be generalized by incorporating the effect of variable temperature history on long-term material behaviour. It must be appreciated that concrete is not a single material, but rather a continuum of materials each with different values of chemo-mechanical parameters. Such is the case because of the fact the volumetric fractions of its constituent phases vary with type of cement, concrete grade, age, reacting chemicals, temperature history, presence of some accelerator or retarder, etc. In this Paper, empirical calibration and validation of the proposed model has been attempted separately for the cases of hydrating and leaching concrete of different grades and under different constant ambient temperatures. For obtaining the unique values of the material parameters for different reacting concretes, it is obviously necessary to undertake experimental investigations on their long-term deformations. Only then can the proposed constitutive model be properly calibrated and validated to command the confidence of its intended users.
Constitutive model for aging thermoviscoelasticity of reacting concrete II: Results and discussion
Ein konstitutives Modell für das Altern der Thermoviskoelastizität von reagierendem Beton II: Ergebnisse und Diskussion
Suter, Milan (author) / Benipal, Gurmail S. (author)
Mechanics of Time-Dependent Materials ; 14 ; 291-305
2010
15 Seiten, 12 Bilder, 18 Quellen
Article (Journal)
English
Viscoelasticity and Thermoviscoelasticity
| Springer Verlag | 2017
First-Strain Gradient Theory of Thermoviscoelasticity
| British Library Online Contents | 2015
First-Strain Gradient Theory of Thermoviscoelasticity
| British Library Online Contents | 2015
Time-dependent behaviour of reacting concrete II: applications and discussion
| Tema Archive | 2006