Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Computers and Concrete Volume 5, Number 4, August 2008 , pages 295-328 DOI: https://doi.org/10.12989/cac.2008.5.4.295 |
|
|
|
A multiscale creep model as basis for simulation of early-age concrete behavior |
||
Ch. Pichler and R. Lackner
|
||
| Abstract | ||
| A previously published multiscale model for early-age cement-based materials [Pichler, et al.2007. ?A multiscale micromechanics model for the autogenous-shrinkage deformation of early-age cement-based materials.? Engineering Fracture Mechanics, 74, 34-58] is extended towards upscaling of viscoelastic properties. The obtained model links macroscopic behavior, i.e., creep compliance of concrete samples, to the composition of concrete at finer scales and the (supposedly) intrinsic material properties of distinct phases at these scales. Whereas finer-scale composition (and its history) is accessible through recently developed hydration models for the main clinker phases in ordinary Portland cement (OPC), viscous properties of the creep active constituent at finer scales, i.e., calcium-silicate-hydrates (CSH) are identified from macroscopic creep tests using the proposed multiscale model. The proposed multiscale model is assessed by different concrete creep tests reported in the open literature. Moreover, the model prediction is compared to a commonly used macroscopic creep model, the so-called B3 model. | ||
| Key Words | ||
| concrete; calcium-silicate-hydrates; early-age concrete; multiscale modeling; logarithmic creep; continuum micromechanics; Laplace-Carson transformation. | ||
| Address | ||
| Ch. Pichler : Institute for Mechanics of Materials and Structures, Vienna University of Technology, Karlsplatz 13/202, A-1040 Vienna, Austria R. Lackner : FG Computational Mechanics, Technical University of Munich, Arcisstra?e 21, 80333 Munich, Germany | ||