Before its widespread use in concrete, most silica fume was land filled.
Today, very little is land filled in the USA.On August 28, 2001, the Environmental Protection Agency (EPA) published
notice in the Federal Register (66 FR 45256) of its intention to add cement
and concrete containing silica fume to the list of materials meeting the
requirements for recycled materials under the auspices of the Resource
Conservation and Recovery Act (RCRA). This proposed action is currently
open for public comment. If approved as proposed, silica fume will join fly
ash and ground granulated blast furnace slag in the category of concrete
materials covered by RCRA.
For additional information on the implications of a material being
identified under RCRA, see the Federal Register cited above or visit the
EPA's web site for RCRA: www.epa.gov/cpg
