reactive silica material

reactive silica material

Any material, such as fly ash, natural pozzolan, or pulverized silica, which reacts at high temperatures with portland cement or lime during autoclaving.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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The stone in the concrete should be inert, but aggregates containing reactive silica materials are common, and highly alkaline cement reacts with the silicon dioxide to form a gel that swells and weakens the concrete.
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