Parametric model for the analysis of concrete expansion due to alkali—aggregate reaction

The alkali—aggregate reaction (AAR) is a chemical reaction that provokes a heterogeneous expansion of concrete and reduces important properties such as Young's modulus, leading to a reduction in the structure's useful life. In this study, a parametric model is employed to determine the spa...

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Bibliographic Details
Published in:Journal of strain analysis for engineering design 2008-07, Vol.43 (5), p.325-335
Main Authors: Carrazedo, R, Lacerda, L A
Format: Article
Language:English
Subjects:
Finite element analysis
Mathematical functions
Mathematical models
Numerical analysis
Porous materials
Research methodology
Sensitivity analysis
Studies
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Summary:The alkali—aggregate reaction (AAR) is a chemical reaction that provokes a heterogeneous expansion of concrete and reduces important properties such as Young's modulus, leading to a reduction in the structure's useful life. In this study, a parametric model is employed to determine the spatial distribution of the concrete expansion, combining normalized factors that influence the reaction through an AAR expansion law. Optimization techniques were employed to adjust the numerical results and observations in a real structure. A three-dimensional version of the model has been implemented in a finite element commercial package (ANSYS©) and verified in the analysis of an accelerated mortar test. Comparisons were made between two AAR mathematical descriptions for the mechanical phenomenon, using the same methodology, and an expansion curve obtained from experiment. Some parametric studies are also presented. The numerical results compared very well with the experimental data validating the proposed method.
ISSN:0309-3247
2041-3130
DOI:10.1243/03093247JSA359