Stabilized Dredged Material. II: Geomechanical Behavior
This article is a reply.
VIEW THE ORIGINAL ARTICLEPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 136, Issue 8
Abstract
This study presents the results of a detailed geotechnical evaluation of six stabilized dredged material (SDM) blends incorporating various combinations of lime, cement kiln dust, high alkali and slag cements, and Class F fly ash. The dredged material classified as CH/OH soil with an in situ moisture content (MC) of approximately 130% and void ratio of 3.35. Mix designs and unconfined compression strength tests were completed for each SDM blend based on 3-day mellowing characteristics. Compacted dry densities were on the order of , with MCs on the order of 34–73%. Peak effective friction angles ranged from 20–50° with cohesion intercepts on the order of 30–235 kPa using a maximum stress obiliquity criterion. Postpeak effective friction angles (15% axial strain) were routinely in excess of 40° with low cohesion ( ; ). One sample exhibited very strong soil-fabric effects (cohesion) having an effective friction angle of only approximately 9°, but cohesion on the order of 450 kPa . Negligible consolidation of a 28-day cured sample was measured. Also, contrary to expectations based on the high sulfate contents (10,000–30,000 mg/kg) of the SDM blends, negligible swell was measured in five of six SDM blends. The main finding of this research is the SDM blends exhibit the strength, compressibility, and bulking characteristics that make them favorable for large fill applications and subgrade improvement applications at costs equivalent to or less than conventional construction materials.
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Acknowledgments
Dominion Virginia Power provided the type F fly ash 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, Pa.). 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, Va.) assisted with the geotechnical testing program. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers(s) and do not necessarily reflect the views of the project sponsors.
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© 2010 ASCE.
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Received: Jul 17, 2008
Accepted: Nov 13, 2009
Published online: Jul 15, 2010
Published in print: Aug 2010
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