Chemo-mechanical modeling for prediction of alkali silica reaction (ASR) expansion

Journal Article · Mon Jun 15 04:00:00 EDT 2009 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2009.03.007· OSTI ID:21260488

Multon, Stephane ^[1]; Sellier, Alain; Cyr, Martin ^[1]

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1. Universite de Toulouse, UPS, INSA, LMDC (Laboratoire Materiaux et Durabilite des Constructions), 135, avenue de Rangueil, F-31 077 Toulouse Cedex 04 (France)

The effect of the size of the aggregate on ASR expansion has already been well illustrated. This paper presents a microscopic model to analyze the development of ASR expansion of mortars containing reactive aggregate of different sizes. The attack of the reactive silica by alkali was determined through the mass balance equation, which controls the diffusion mechanism in the aggregate and the fixation of the alkali in the ASR gels. The mechanical part of the model is based on the damage theory in order to assess the decrease of stiffness of the mortar due to cracking caused by ASR and to calculate the expansion of a Representative Elementary Volume (REV) of concrete. Parameters of the model were estimated by curve fitting the expansions of four experimental mortars. The paper shows that the decrease of expansion with the size of the aggregate and the increase of the expansion with the alkali content are reproduced by the model, which is able to predict the expansions of six other mortars containing two sizes of reactive aggregate and cast with two alkali contents.

• OSTI ID: 21260488
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 6 Vol. 39; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CONCRETES
CRACKS
EXPANSION
FORECASTING
GELS
MASS BALANCE
MORTARS
PARTICLE SIZE
SILICA
SIMULATION