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Modeling of Early-Age Creep of Shotcrete. I: Model and Model Parameters |
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| Authors: | Jér?me Sercombe Christian Hellmich Franz-Josef Ulm Herbert Mang |
| Affiliation: | 11Res. Engr., Concrete Dept., Commissariat à l'Energie Atomique, Saclay, France; formerly, Inst. for Strength of Materials, Vienna, Austria. E-mail: jerome.sercombe@cea.fr 22Univ. Asst., Vienna Univ. of Technology, Inst. for Strength of Materials, Karlsplatz 13∕202, 1040 Vienna, Austria. E-mail: christian. hellmich@tuwien.ac.at 33Assoc. Prof., Massachusetts Inst. of Technology, Dept. for Envir. and Civ. Engrg., 77 Massachusetts Ave., Cambridge, MA 02139-4307; formerly, Laboratoire Central des Ponts et Chaussées, Paris, France. E-mail: ulm@mit.edu 44Prof., Vienna Univ. of Technology, Inst. for Strength of Materials, Karlsplatz 13∕202, 1040 Vienna, Austria. E-mail: herbert.mang@ tuwien.ac.at |
| Abstract: | In this paper, creep and viscous flow are revisited from the standpoint of constitutive modeling of thermo-chemo-mechanical couplings in early-age concrete. Within the framework of closed reactive porous media, creep is modeled by means of two mechanisms: a stress-induced water movement within the macropores and a relaxation mechanism in the micropores of cement gel, both of which lead to aging effects on creep and viscous flow of concrete. Regarding the first creep mechanism, aging results from chemomechanical couplings. Concerning the second mechanism, long-term aging is attributed to the relaxation of microprestresses in the micropores. Following the formulation of the model, it is shown how the material parameters can be identified from creep tests performed at different ages of loading. Finally, the model is applied to shotcrete, for which proper experimental data are missing. |
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