Modeling of Structures Affected by Alkali Aggregate Reaction

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Title: Modeling of Structures Affected by Alkali Aggregate Reaction

Author(s): E. Grimal, A. Sellier, S. Multon, E. Bourdarot

Publication: Special Publication

Volume: 266

Issue:

Appears on pages(s): 101-108

Keywords: alkali-aggregate reaction; durability; modeling; structural expertise.

Date: 10/1/2009

Abstract:
The alkali aggregate reaction (AAR) is affecting numerous civil engineering structures and is responsible for unrecoverable expansion and cracking which can affect their functional capacity. In order to control the safety level and the maintenance cost of its hydraulic dams, Electricité de France (EDF) has to get a better understanding and a better prediction of the expansion phenomena. In this context, EDF is developing a numerical modelling based on the finite element method in order to assess the mechanical behavior of degraded structures. Obtaining a good prediction of expansive phenomena requires the identification and realistic modelling of the underlying physical, chemical and mechanical phenomena. The model takes into account the mechanical damage, the creep of concrete and the stress induced by the formation of AAR gel. Coupling between the different phenomena (creep, AAR and anisotropic damage) are taken into account through a rheological modelling. First , experimental results obtained on concrete cylinders and beams affected by AAR are simulated to verify whether the model can describe the behavior of degraded structures.