Resistance of alkali-activated slag concrete to alkali-aggregate reaction

This paper presents an investigation into durability of alkali-activated sl ag (AAS) concrete exposed to alkali-aggregate reaction (AAR). In the concre te prism test method (ASTM C 1293), reactive aggregates introduced in the A AS matrix reacted with alkali-silica nel formed around aggregates. The expa nsion of PLAS concrete prisms was 0.04% after 50 days and 0.1% after 22 mon ths. The expansion in OPC concrete was about 0.03% after 22 months of exper iment. It was found that AAS concrete had lower resistance to alkali-aggreg ate attack than that of OPC concrete of similar grade. (C) 2001 Elsevier Sc ience Ltd. All rights reserved.