Six kinds of coarse aggregates were used in order to evaluate the reactivity of alkali-silica reaction of aggregates by using JIS A 1145, 1146 and ASTM C 1260 methods. The evaluation obtained by the chemical or mortar bar of methods specified in JIS did not agree with that by the accelerated mortar bar method specified in ASTM. The expansion of mortar bar due to ASTM C 1260 was dependent on the type of aggregate. It was also observed that the expansions of mortar bar under the accelerated condition (in NaOH solution of 1mol/l at 80°C) were influenced by the size of specimen, added alkali content and alkali content intruded into specimen from the solution in test container during test period.
