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

By R. N. Swamy

This ebook studies the elemental factors and spectrum results of ASR. It considers he advances which have been made in our knowing of this challenge through the international.

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Perhaps the most successful and direct method of obtaining pore fluid compositions is that of pore fluid expression. Neat cement cylinders, prepared to a realistic w/c ratio, are allowed to set and cure normally and subsequently subjected to high pressure in a special device, known colloquially as a ‘squeezer’, to extract pore fluid. This method was pioneered by Longuet10 and further developed by Barneyback and Diamond11. Very high pressures may be required to extract pore fluid; in the writer’s laboratory, 100 tonnes of thrust are available for application to cement cylinders 42 mm in diameter.

1 shows schematically how the amounts of the various phases change as a function of time for the paste fraction of a fly ash blend; the diagram is schematic as the exact proportions of the various phases will depend on the cement type, on the reactivity of the fly ash, on the w/c ratio, temperature, etc. It is, however, important to note that considerable water remains even after the cement is essentially fully hydrated. During the initial stages of hydration the aqueous phase is most abundant, and it is more or less continuous in the sense that it wets the solid-phase grains.

1976) On the alkali-carbonate reactivity of aggregates from Iraqi quarries. Proceedings of the Third International Sympositum on the Effect of Alkalis on the Properties of Concrete pp. 255–265. 17. K. (1975) The natural aggregate materials of Bahrain and their influence on concrete durability. PhD Thesis, University of London. 18. A. (1965) Alkali aggregate reactions, concrete aggregate testing and problem aggregates in Ontario, a review. Ontario Ministry of Transportation and Communications. Engineering Materials Office, Canada.

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