United States Department of Transportation
i
Evaluation of fly ash in lean Portland Cement Concrete base "Econocrete".
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1986-08-01
[PDF-1.14 MB]
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Alternative Title:Evaluation of fly ash in lean Portland Cement Concrete base Econocrete
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Abstract:Fly ash was used in this evaluation study to replace 30, 50 and 70
percent of the 400 1bs. of cement currently used in each cu. yd. of
portland cement econocrete base paving mix.
Two Class "c" ashes and one Class "F" ash from Iowa approved sources
were examined in each mix. When Class "c" ashes were used, they were
substituted on the basis of 1.0 pound for each pound of cement removed.
When Class "F" ash was used, it was substituted on the basis
of 1.25 pounds of ash for each pound of cement removed.
Compressive strengths with and without fly ash were determined at 7,
28 and 56 days of age. In most cases, strengths were adequate.
The freeze/thaw durability of the econocrete mixes studied was not adversely
affected by the presence of fly ash.
The tests along with erodibility and absorption tests have demonstrated
the feasibility of producing econocrete with satisfactory mechanical
properties even when relatively low quality and/or locally
available aggregate is being used at no sacrifice to strength and/or
durability.
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