Abstract
The ASTMC 1260 method is an accelerated mortar bar test (AMBT) and has widely been used in the USA and elsewhere to assess susceptibility of aggregates to alkali-aggregate reaction (AAR). Five slowly-reactive Australian aggregates, which have caused significant damage to structures, were used to assess the suitability of this test method for detecting the reactivity of such aggregates. These aggregates were classed as non-reactive or uncertain by ASTMC 1260. This situation is unacceptable and necessitates changes to the test limits. The AMBT method used in Australia (RTA T363 designation for RTA, NSW, and RC 376.03 designation for VicRoads, Victoria) correctly classified such aggregates as slowly-reactive. It has been concluded that Australian test limits are more appropriate for the slowly-reactive aggregates. It is suggested that the Australian acceptance limit of < 0.1% expansion at 21 days of storage in 1M NaOH solution at 80 °C, be adopted by ASTMC 1260, or that the currently applied 14-day expansion limit be lowered from 0.10% to 0.08%.
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