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Porosity/Diffusivity And Alkali-Silica Reaction

Published online by Cambridge University Press:  22 February 2011

Micheline Moranville-Resocurd
Micheline Moranville-Resocurd*
Affiliation:
Direction Scientifique, C.E.B.T.P., 12, rue Brancion, 75015 PARIS, FRANCE
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Abstract

Physical and chemical processes are responsible for the alkali-silica reaction in concrete. Physical processes include (i) migration of hydroxyl and alkali ions (ii) swelling by water imbibition of the alkali-silica gel produced, (iii) development of cracks. Chemical processes involve (i) neutralisation of acidic silanol groups and attack of siloxane bridges, both by OH- ions (ii) formation of an alkali silicate. These reactions result in a breakdown in the silica structure and diffusion of some silicate and impregnate the cement paste filling the capillary pores. The increase in permeability due to the opening and progression of cracks facilitates secondary chemical deteriorations like the formation of ettrinqite, carbonation and corrosion of steel reinforcement. Recent studies have emphasized the role of Ca(OH)2 preventing the dissolution or miqration of freed silica out of the structure. Only the removal of Ca(OH)2 is able to stop the expansion of concrete.

The paper will present some new interpretations of alkali-silica reaction related to the diffusivity of various ions from the pore solution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 137: Symposium P – Pore Structure and Permeability of Cementitious Materials , 1988 , 225
Copyright
Copyright © Materials Research Society 1989

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