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Chapter 1 - Understanding Silica Fume
Silica Fume Definitions

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Precipitated silica, fumed silica, and gel silica are purposely made forms of silica. While these materials are amorphous and would be expected to perform well in concrete, they are typically too expensive for such use. More information on these materials may be found in ASTM E 1156 or in the work of Dunnom.

Colloidal silica is a stable dispersion of discrete synthetic amorphous particles of silicon dioxide. Colloidal silica may also be referred to as silica gel. Again because of the expense, colloidal silica is not being used in concrete.

Silica flour is a crystalline form of silica that may perform as a filler material in concrete. It will not contribute as a pozzolan.

ASTM E 1156, Standard Practice for Health Requirements for Occupational Exposure to Synthetic Amorphous Silica.

Dunnom, D., ed., 1984, Definitions for Asbestos and other Health-Related Silicates, STP 834, ASTM, West Conshohocken, PA.