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Short and Long-Term Leaching Behavior of a Low-Calcium Fly Ash and Cement-Stabilized Fly Ash

Published online by Cambridge University Press:  25 February 2011

R. I. A. Malek ,
P. H. Licastro  and
D. M. Roy
R. I. A. Malek
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
P. H. Licastro
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
D. M. Roy
Affiliation:
Also Affiliated with the Department of Materials Sciences and Engineering
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Abstract

Low-calcium fly ashes from eastern Pennsylvania power plants, stabilized with Portland cement, have a potential application as a pipeline bedding material. A typical fly ash, and a cement-stabilized material made with this fly ash, were subjected to extensive physical and chemical characterization. Two procedures were used to investigate whether leachates from the bedding materials were nonhazardous according to the criteria of the regulatory agencies. The first was the short-term EPA test, used to define a hazardous waste under the RCRA regulations, and the second was a long-term flow-through test developed at MRL/PSU. In the second test, driving pressure, flow rate and permeability were monitored during the experiment. Calculations showed that this flow-through technique simulates rain water percolation in a similar sized bed for about 25 years. The leaching fluids in both methods were deionized water (EPA procedure) and simulated rain water. Analyses for seventeen metals by DC plasma emission spectrometry and for seven anions by ion chromatography were performed. Concentrations of the leachates from the two procedures were well below the levels that define a hazardous waste. Considerable insight into the long term leaching mechanisms of various elements was obtained from the flow-through experiments.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 65: Symposium T – Fly Ash and Coal Conversion By-Products II , 1985 , 269
Copyright
Copyright © Materials Research Society 1986

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