Maio 2014 vol. 1 num. 1 - 10th World Congress on Computational Mechanics
Full Article - Open Access.
CHEMICAL AND MECHANICAL DAMAGE IN CONCRETE DUE TO SWELLING OF ALKALI-SILICA GEL
In the present work, concrete affected by alkali-silica reaction (ASR) is represented as a two-phase material made of a solid skeleton and an expanding gel, which exerts a pressure capable of severely damaging concrete. As suggested by the experimental results, degradation due to ASR is considered to be localized around the reactive sites and it is described through an isotropic chemical damage variable. Another internal variable is introduced to describe the mechanical damage induced by the external loads. The chemical damage evolution depends on the reaction extent and it is calibrated using the value of the gel pressure, estimated by applying the electrical double-layer theory to the experimental values of the surface charge density obtained from ASR gel specimens. The model is then employed to simulate compression and flexure tests results reported in the literature.
Palavras-chave: ASR, concrete, damage, chemical damage.,
-  M. Prezzi, P. J. M. Monteiro, and G. Sposito, “The alkali-silica reation, part 1: use of the double-layer theory to explain the behavior of reaction-product gels,” ACI materials journal, vol. 94, no. 1, pp. 10–17, 1997.
-  L. J. Struble and S. Diamonds, “Swelling properties of synthetic alkali silica gels,” Journal of American Ceramic Society, vol. 64, no. 11, pp. 652–655, 1981.
-  M. Kawamura and K. Iwahori, “Asr gel composition and expansive pressure in mortars under restraint,” Cement and Concrete Composites, vol. 26, pp. 47–56, 2004.
-  F. J. Ulm, O. Coussy, L. Kefei, and C. Larive, “Thermo-chemo-mechanics of asr expansion in concrete structures,” ASCE Journal of Engineering Mechanics, vol. 126, no. 3, pp. 233–242, 2000.
-  C. Comi, R. Fedele, and U. Perego, “A chemo-thermo-damage model for the analysis of concrete dams affected by alkali-silica reaction,” Mechanics of Materials, vol. 41, pp. 210–230, 2009.
-  C. Comi and R. Pignatelli, “A three-phase model for damage induced by asr in concrete structures,” in IV International Conference on Computational Methods for Coupled Problems in Science and Engineering, 2011.
-  S. Multon, Evaluation experimentale et theorique des effects mechaniques de l’alcalireaction sur des structures modeles. PhD thesis, LCPC, 2003.
-  G. Giaccio, R. Zerbino, J. Ponce, and O. Batic, “Mechanical behavior of concretes damaged by alkali-silica reaction,” Cement and Concrete Research, vol. 38, pp. 993–1004, 200
-  J. Israelachvili, Intermolecular and surface forces. Academic press, 1992.
-  M. A. Biot and D. G. Willis, “The elastic coefficients of the theory of consolidation,” Journal of applied mechanics, vol. 57, no. APM44, pp. 594–601, 1957.
-  O. Coussy, Poromechanics. New York: John Wiley and Sons, 2004.
-  K. Kendall, A. J. Howard, and J. D. Birchall, “The relation between porosity, microstructure and strength, and the approach to cement-based materials,” Philos. Trans. R. Soc. London, vol. A 310, pp. 139–153, 1983.
-  M. Ben Haha, G. A. Gallucci, E., and S. K. L., “Relation of expansion due to alkali silica reaction to the degree of reaction measured by sem image analysis,” Cement and Concrete Research, vol. 37, pp. 1206–1214, 2007.
-  C. Comi and U. Perego, “Fracture energy based bi-dissipative damage model for concrete,” International Journal of Solids and Structures, vol. 38, pp. 6427–6454, 2001.
Comi, C.; Monteiro, P. J. M.; Pignatelli, R.; "CHEMICAL AND MECHANICAL DAMAGE IN CONCRETE DUE TO SWELLING OF ALKALI-SILICA GEL", p. 503-514 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1].
São Paulo: Blucher,
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-16820
últimos 30 dias | último ano | desde a publicação