Blucher Mechanical Engineering Proceedings

Maio 2014, vol.1, num.1 - 10th World Congress on Computational Mechanics
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NUMERICAL MODELING OF ORTHOTROPIC CONCRETE EXPANSION DUE TO ALKALI-AGGREGATE REACTION WITH A PARAMETRIC MODEL

NUMERICAL MODELING OF ORTHOTROPIC CONCRETE EXPANSION DUE TO ALKALI-AGGREGATE REACTION WITH A PARAMETRIC MODEL

Carrazedo, R.; Sanches, R. A. K.; Lacerda, L. A. de

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The alkali-aggregate reaction (AAR) in concrete structures consists in a chemical deleterious reaction between alkalis liberated during hydration of cement and reactive min-erals present on aggregates. The process leads to the formation of a gel, which in presence of hydroxyl ions expands, causing cracks in concrete, promoting its volume variation, followed by reduction of important properties, such as the Young´s modulus and mechanical strength. Modeling of a structure subjected to AAR expansion may predict the structural displacements and strains due to the reaction, enabling programming efficient structural maintenance oper-ations , reducing temporary interruptions and also increasing safety conditions. As such, this work presents a parametric model for simulating the orthotropic concrete ex-pansion due to alkali-aggregate reaction, based on Carrazedo and Lacerda, 2008[1].

The alkali-aggregate reaction (AAR) in concrete structures consists in a chemical deleterious reaction between alkalis liberated during hydration of cement and reactive min-erals present on aggregates. The process leads to the formation of a gel, which in presence of hydroxyl ions expands, causing cracks in concrete, promoting its volume variation, followed by reduction of important properties, such as the Young´s modulus and mechanical strength. Modeling of a structure subjected to AAR expansion may predict the structural displacements and strains due to the reaction, enabling programming efficient structural maintenance oper-ations , reducing temporary interruptions and also increasing safety conditions. As such, this work presents a parametric model for simulating the orthotropic concrete ex-pansion due to alkali-aggregate reaction, based on Carrazedo and Lacerda, 2008[1].

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DOI: 10.5151/meceng-wccm2012-18699

Referências bibliográficas
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Como citar:

Carrazedo, R.; Sanches, R. A. K.; Lacerda, L. A. de; "NUMERICAL MODELING OF ORTHOTROPIC CONCRETE EXPANSION DUE TO ALKALI-AGGREGATE REACTION WITH A PARAMETRIC MODEL", p-2054-2063. In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 23580828, DOI 10.5151/meceng-wccm2012-18699

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