Interest in the Alkali-Aggregate Reaction (AAR) in concrete structures has increased in recent times because of the risk for dam safety and the high cost of repairs and replacements. Though this reaction does not concern dam concrete only, one of the first structures identified as affected by AAR was the Parker Dam (USA) in 1941 and an ICOLD survey in 1985 has shown the worldwide distribution of damaged dams because of AAR. The purpose of this Bulletin is to make aware those responsible for dam safety of the AAR risk and to give recommendations for minimizing this risk at the design and construction stages and adequately treating old dams which may be affected. Though chemists and petrographers can be retained as advisers in the evaluation ofthe problem, a general understanding of the science of AAR is also necessary to engineers who have the final responsibility for the design, construction, operation and maintenance of the structures. This Bulletin is therefore mainly educational and, in consequence, of the greatest interest for the profession as a whole as well as for everybody involved in all concrete structures.

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