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Investigation of Leachability of Subbituminous Fly Ash Enhanced Road Base Materials

Published online by Cambridge University Press:  25 February 2011

Ivan Garcez  and
Marty E. Tittlebaum
Ivan Garcez
Affiliation:
Department of Civil Engineering, Louisiana State University, Baton Rouge, LA 70803
Marty E. Tittlebaum
Affiliation:
Department of Civil Engineering, Louisiana State University, Baton Rouge, LA 70803
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Abstract

Enormous amounts of coal fly ash produced by the utilities industry create a significant disposal problem. The abundance of fly ash along with its self-hardening properties led the Louisiana Department of Transportation and Development (LA DOTD) to use fly ash as a soil stabilizer for road bases. However, the LA DOTD is primarily concerned with the strength of the material and has not studied its leaching characteristics. In this study, a total of three samples, a 30 percent subbituminous fly ash/soil mixture, subbituminous fly ash, and soil, were leached following the EPA multiple extraction procedure and analyzed by Inductively Coupled Argon Plasma Spectrometry (ICAP). Results indicate that little change in leachate quality of subbituminous fly ash was caused by the soil stabilization process. The insignificant change is attributed to the low cation exchange capacity of the soil. ICAP analysis revealed that levels of toxic metals in the leachates are well within RCRA standards.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 43: Symposium M – Fly Ash and Coal Conversion By-Products I , 1984 , 237
Copyright
Copyright © Materials Research Society 1985

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References

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