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Modelling alkali silica reaction in concrete



Title: Modelling alkali silica reaction in concrete
Author(s): R. Naar, E. Garcia-Diaz, F. Bay, P.O. Bouchard
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 207 - 212
Total Pages: 6
Nb references: 7
Language: English


Abstract: Alkali silica reaction (ASR) plays a major role in the degradation of various types of massive concrete structures. The alkali silica reaction induces aggregates swelling thus leading to irreversible degradation of concrete structures. Therefore, it is of prime importance for civil engineering applications to understand and model damage and cracks evolution in a concrete sample submitted to ASR.
The computational tool FEMCAM (Finite Element Model for Concrete Analysis Method) has been developed within this framework in order to carry out a 3D coupled chemicalmechanical analysis for concrete. In this software, a mesoscale approach is considered where concrete is modelled as a heterogeneous material with two main phases: the aggregates embedded in a mortar paste. The mortar paste behaviour is assumed to obey an elastic constitutive law coupled with the damage model Mazars, whereas aggregates are modelled using a purely elastic law. This 3D computational model will thus enable us to describe the reaction mechanisms of the ASR and its mechanical effects on the material.
We have thus implemented in FEMCAM a numerical procedure to solve the diffusion equation for the alkaline ions. The swelling of reactive aggregates is also modelled to describe damage due to ASR in concrete structures.


Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00