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What are hydraulic and pozzolanic reactions?

April 26, 2017hydraulic reactions

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What are hydraulic and pozzolanic reactions?

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These terms describe how concrete sets and then hardens. Hydraulic reactions occur when a reactive ingredient is mixed with water. Cement is hydraulic, and so are Class C fly ash and certain types of ground-granulated blast-furnace slags. Pozzolanic reactions occur in the presence of calcium hydroxide (Ca(OH)2), which is a by-product of the hydration of cement. Class F fly ash, silica fume, calcined clays, and most slags are pozzolanic. Both hydraulic and pozzolanic reactions increase the strength and durability of finished concrete, and alter the fresh properties of concrete.