Abstract
Expansion of miniature rock prisms sawn normal to the layering of the rock and stored in 2N NaOH was monitored with a Huggenberger gauge or a linear voltage differential transformer (LVDT). Owing to their thinness (3 mm) the samples become saturated quickly and expansion usually commences within the first week, compared with the long initiation period typical of the rock cylinder method ASTM C586. The miniature rock prism test was evaluated for alkali-carbonate, slowly expanding siliceous aggregates and classical alkali-silica reactive rocks. Rates of expansion generally correlated well with those of corresponding concrete prisms tested according to CSA A23.2 - 14A.
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