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hygro-thermo-chemo-mechanical modelling of concrete at early ages and beyond. part ii：shrinkage and creep of concrete.pdf

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hygro-thermo-chemo-mechanical modelling of concrete at early ages and beyond. part ii：shrinkage and creep of concrete

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING Int. J. Numer. Meth. Engng 2006; 67:332–363 Published online 31 January 2006 in Wiley InterScience (). DOI: 10.1002/nme.1636 Hygro-thermo-chemo-mechanical modelling of concrete at early ages and beyond. Part II: Shrinkage and creep of concrete Dariusz Gawin1, ‡, Francesco Pesavento2, ∗, † and Bernhard A. Schreﬂer2, § 1 Department of Building Physics and Building Materials , Technical University of Łód´z, Al. Politechniki 6, 90-924 Łód´z, Poland 2Department of Structural and Transportation Engineering , University of Padua, via Marzolo 9, 35131 Padova, Italy SUMMARY In Part I of this paper (Int. J. Numer. Meth. Eng., in print) a mechanistic model of hygro-thermo- chemical performance of concrete at early ages has been introduced. Additionally, as compared to the existing models (e.g. J. Eng. Mech. (ASCE) 1995; 121(7):785–794; 1999; 125(9):1018–1027), an effect of relative humidity on cement hydration rate and associated hygro-thermal phenomena have been taken into account. Here we deal with mechanical performance of concrete at early ages and beyond, and in particular, evolution of its strength properties (aging) and deformations (shrinkage and creep strains), described by using the effective stress concept. This allow us for explanation and modelling of phenomena known from experiments, like drying creep (e.g. Mathematical Modeling of Creep and Shrinkage of Concrete. Wiley: Chichester, 1988), or some additional strains, as compar