Alkali-Silica Reaction in Concrete by R. N. Swamy

By R. N. Swamy

This booklet stories the basic motives and spectrum results of ASR. It considers he advances which have been made in our realizing of this challenge in the course of the international.

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Another method of simulating pore fluid which is frequently employed enables real cements to be used: neat cement, formulated to a realistic w/c ratio, is allowed to set and mature normally but is subsequently crushed and extracted, using water as the leachant. The resulting solution is filtered and analysed. These filtrates are also strongly alkaline but, in contrast to laboratory simulants, their alkalinity is controlled primarily by soluble sodium and potassium and to a lesser extent by calcium; the common ion (OH–) effect operates so as to reduce its solubility.

Pessimum proportions obviously do not and need not occur at the 50% level. If a reactive aggregate has a higher rate of removal of alkalis than the simple case illustrated, each unit increase in reactive constituent will remove a larger proportion of the starting concentration of alkali. 6. Most research studies concerned with pessimum proportions deal with a range of concentrations of reactive aggregate material and with a single alkali level only in all the concrete or mortar samples considered.

113–140. 23. C. (1985) Quelques problèmes actuels de conception, construction, entretien et confortement. Journées d’Etudes No. 256. Copyright 1992 Blackie and Son Ltd 24. C. (1944) Studies relating to the mechanism by which alkali-aggregate reaction produces expansion in concrete. J. Am. Concr. Inst. 15, 213–217. 25. E. (1951) Studies in cement aggregate reaction. XVI. The effect of hydroxyl ions on the reaction of opal. Aust. J. Appl. Sci. 2, 108–113. 26. S. and Kataoka, N. (1981) The chemistry of alkali-aggregate reactions.

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