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A platform for research: civil engineering, architecture and urbanism
Constitutive model for aging thermoviscoelasticity of reacting concrete I: Theoretical formulation
In this Part I of the Paper, a unified constitutive model for the aging thermochemoviscoelasticity of concrete has been proposed. Viscosity has not been assumed to be a primitive concept, but two physico-chemical mechanisms - Dissolution-Precipitation Mechanism and Modified Adaptive Link Mechanism - have been proposed as possible causes of the viscous flow of reacting elastic concrete. Correspondingly, two expressions for the material viscosity tensor have been derived in terms of volume fractions and elasticity constants of the constituent phases and the rates of ongoing reaction, if any, and of bond breakage and restoration. The proposed Unified Constitutive Model has been interpreted as a general Aging Standard Linear Rheological Model. Mathematical expressions simulating the effect of ambient constant temperature on process kinetics have been proposed. Effect of variable temperature histories on process kinetics has not yet been incorporated. Using the proposed Unified Constitutive Model, the theoretical predictions for the long-term mechanical behaviour of reacting concrete subjected to different stress and strain histories and at different ambient constant temperatures have been presented and practical relevance of the work done has been discussed in Part II of the Paper.
Constitutive model for aging thermoviscoelasticity of reacting concrete I: Theoretical formulation
In this Part I of the Paper, a unified constitutive model for the aging thermochemoviscoelasticity of concrete has been proposed. Viscosity has not been assumed to be a primitive concept, but two physico-chemical mechanisms - Dissolution-Precipitation Mechanism and Modified Adaptive Link Mechanism - have been proposed as possible causes of the viscous flow of reacting elastic concrete. Correspondingly, two expressions for the material viscosity tensor have been derived in terms of volume fractions and elasticity constants of the constituent phases and the rates of ongoing reaction, if any, and of bond breakage and restoration. The proposed Unified Constitutive Model has been interpreted as a general Aging Standard Linear Rheological Model. Mathematical expressions simulating the effect of ambient constant temperature on process kinetics have been proposed. Effect of variable temperature histories on process kinetics has not yet been incorporated. Using the proposed Unified Constitutive Model, the theoretical predictions for the long-term mechanical behaviour of reacting concrete subjected to different stress and strain histories and at different ambient constant temperatures have been presented and practical relevance of the work done has been discussed in Part II of the Paper.
Constitutive model for aging thermoviscoelasticity of reacting concrete I: Theoretical formulation
Ein konstitutives Modell für das Altern der Thermoviskoelastizität von reagierendem Beton I: Theoretische Formulierung
Suter, Milan (author) / Enipal, Gurmail S. (author)
Mechanics of Time-Dependent Materials ; 14 ; 277-290
2010
14 Seiten, 6 Bilder, 31 Quellen
Article (Journal)
English
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