Abstract
We propose a micromechanics model for aging basic creep of early-age concrete. Therefore, we formulate viscoelastic boundary value problems on two representative volume elements (RVEs), one related to cement paste (composed of cement, water, hydrates, air), and one related to concrete (composed of cement paste and aggregates). Homogenization of the non-aging elastic and viscoelastic properties of the material’s constituents involves the transformation of the aforementioned viscoelastic boundary value problems to the Laplace-Carson (LC) domain. There, formally elastic, classical self-consistent and Mori-Tanaka solutions are employed, leading to pointwisely defined LC-transformed tensorial creep and relaxation functions. Subsequently, the latter are backtransformed, by means of the Gaver-Wynn-Rho algorithm, into the time domain. Temporal derivatives of corresponding homogenized creep tensors, evaluated for the current maturation state of the material and for the current time period since loading of the hydrating composite material, allow for micromechanical prediction of the aging basic creep properties of early-age concrete.
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Scheiner, S., Hellmich, C. (2009). Continuum Microviscoelasticity Model for Cementitious Materials: Upscaling Technique and First Experimental Validation. In: Bittnar, Z., Bartos, P.J.M., Němeček, J., Šmilauer, V., Zeman, J. (eds) Nanotechnology in Construction 3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00980-8_10
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DOI: https://doi.org/10.1007/978-3-642-00980-8_10
Publisher Name: Springer, Berlin, Heidelberg
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