Abstract
To explain the roles of Ca(OH) 2 and alkali chlorides in alkali-silica reaction, it has been proposed that during the chemical reaction alkali and hydroxyl ions enter the reactive silica grains leaving behind Ca and chloride ions in the liquid phase. This postulated reaction has been verified by estimating [Ca ++] and [OH −] in the liquid phase of the system reactive silica-Ca(OH) 2-alkali chloride water. The results of this investigation indicate that other things being constant the rate of alkali-silica reaction is determined by the size of the hydrated alkali ion; the larger the size the lower is the rate of reaction. It seems that the reactivity of an aggregate may be evaluated in a cement-free system. The results suggest that the alkali-silica reactivity of an aggregate could be evaluated simply by measuring OH − ion concentration in the system reactive sand-CA(OH) 2-satd. alkali chloride solution and comparing it with that of the system quartz sand-Ca(OH) 2-satd. alkali chloride solution.
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