Abstract
The gel fluorescence test has been used to determine the presence of alkali-silica reaction products from two field structures and laboratory mortar bars made with reactive opaline aggregate. It is shown that the fluorescence test identifies clearly the products of the reaction between alkalis and reactive silica. A comparison of the expansions of the mortar bars and the amount of gel products in the bars suggests that the fluorescence test cannot be used as an indicator of potential expansion; however, it can be used successfully to determine the presence or absence of products of alkali-silica reaction and thus provide clues to the probable causes of deterioration observed in concrete.
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