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Mass concrete at Friant Dam was produced with high- and low-alkali cements both with and without natural pozzolan (pumicite). Recent and previous investigations indicate (a) concrete deterioration due to alkali-aggregate reaction has taken place to varying extent and degree within the dam; (b) compressive strength and modulus of elasticity have decreased due to alkali-aggregate reaction; (c) preliminary tests suggest alkalies are not present in the concrete in sufficient quantity to contribute to expansive reactions; and (d) the potentially deleteriously alkali-reactive aggregate is of andesite affinity.
alkali-aggregate reaction, alkali-silica reaction, natural pozzolan, pumicite, compressive strength, modulus of elasticity, expansion potential, mortar bar, petrographic examination, andesite, alkali-availability, osmotic cell, cement, concrete, concrete dam, cherty and glassy volcanics, expansion
geologist/petrographer, Bureau of Reclamation, Denver Office, Denver, CO