Stabilized Dredged Material. I: Parametric Study
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 136, Issue 8
Abstract
This study presents the results of a treatability study for dredged material (DM) stabilization using 20 combinations of pozzolanic agents (lime, cement kiln dust, high alkali and slag cements, and fly ash). The DM consisted of CH/OH soil excavated from the U.S. Army Corps of Engineers Craney Island confined disposal facility in Hampton Roads, Virginia, having an in situ moisture content of approximately 130% and void ratio of 3.35. Mix designs were prepared for each stabilized DM (SDM) blend using a 3-day mellowing period for the SDM blends to become compactable. Typical maximum dry unit weights were on the order of , for total dry pozzolan doses to wet DM between 5 and 95%, the upper dosing limit being unconstrained for potential use of the SDM blends as fill. Unconfined compression strength (UCS) testing of the SDM blends using DM with an initial MC of 132.5% was completed in accordance with ASTM D1632 and ASTM D1633 for curing times of 7, 28, and 180 days. The 28-day cured specimens had UCS values up to 800 kPa (115 psi). Leaching analyses of the various SDM blends for Resource Conservation and Recovery Act metals using toxicity characteristic leaching procedure and deionized water solutions for extended durations and contact times illustrated that the SDM blends were nonhazardous and virtually identical to the raw DM. Overall, the use of industrial by-products in SDM blends suggests that it may be possible to undertake large-scale fill construction that is sustainable, cost-effective, and environmentally protective of human health and the environment.
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Acknowledgments
Dominion Virginia Power provided the Class F FA to support this research. Messrs. David Bristow (Dominion) and Ron Birckhead (Dominion-retired) are thanked for their support and involvement. Messrs. Sam McGee and Carlos M. Quinones of USACE Craney Island facilitated the DM sample collection. The lime, CKD, type IE PC, and NewCem were provided by Mr. Jeff Fair of Lafarge North America (Whitehall, Pennsylvania). Mr. Raymond DeStephen (Schnabel) and the sponsors provided many useful comments to the manuscript. Messrs. David Cinsavich, Matt Farley and Dennis Stevens of Schnabel (Blacksburg, Virginia) assisted with the geotechnical testing program. Ms. Alexandra Srebro of Schnabel (West Chester, Pennsylvania) assisted with the graphics for this paper. The CTL Group (Skokie, Ill.) evaluated the bulk chemistry of the materials whereas Test America (King of Prussia, Pennsylvania) reported on all environmental chemistry parameters, except sulfate (Columbia Analytical, Rochester, New York). TCLP and DIW extraction analyses were completed by the Center for Environmental Systems at the Stevens Institute of Technology (Hoboken, New Jersey). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writer(s) and do not necessarily reflect the views of the project sponsors.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 136 • Issue 8 • August 2010
Pages: 1011 - 1024
Copyright
© 2010 ASCE.
History
Received: Jul 17, 2008
Accepted: Sep 18, 2009
Published online: Jul 15, 2010
Published in print: Aug 2010
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