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Abstract:With the support of the Iowa Fly Ash Affiliates, research on reclaimed fly ash for use as a
construction material has been ongoing since 1991. The material exhibits engineering
properties similar to those of soft limestone or sandstone and a lightweight aggregate. It is
unique in that it is rich in calcium, silica, and aluminum and exhibits pozzolanic properties
(i.e. gains strength over time) when used untreated or when a calcium activator is added.
Reclaimed Class C fly ashes have been successfully used as a base material on a variety of
construction projects in southern and western Iowa. A pavement design guide has been
developed with the support of the Iowa Fly Ash Affiliates.
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