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Silica Fume - A finely-divided mineral admixture, available in both un-compacted and compacted forms. It is a pozzolanic material which is composed of highly refined silicon dioxide in the non-crystalline form. Silica Fume will chemically react with the calcium hydroxide released by the hydration of portland cement to form compounds possessing superior cementitious properties. This ultra-fine material will better fill voids between cement particles and result in a very dense concrete with higher compressive strengths and extremely low permeability.