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Abstract
A rapid method for the identification of alkali reactivity of aggregate within two days has beeb achieved. 1×1×4 cm mortar bars with cement:aggregate = 10:1, w/c = 0.3, size of aggregate = 0.15−0.75mm were demolded after one-day curing and subjected subsequently to 100°C steam curing for 4 hours, after which they were immersed in 10% KOH solution and autoclave-treated at 150°C for 6 hours. After each stage of curing expansion measurements were carried out. From the data of more than thirty species of rocks, the authors arrived at the conclusion that the rapid method could be used to distinguish reactive and non-reactive aggregate. The results of microscopic observation made clear that the expansion of mortar bars was caused by alkali-silica reaction. This method cannot only be used to identify the alkali reactivity of aggregate, but when combined with the use of optic and electron microscope, can be also used to study the mechanism of alkali-aggregate reaction.
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