United States Department of Transportation
i
Utilization of a Pneumatic Tube Mixing Technique for Processing and Stabilization of Contaminated Dredged Material
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2016-12-01
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[PDF-513.16 KB]
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TRIS Online Accession Number:01637023
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Abstract:The following progress report describes the laboratory activities completed for the development of the experimental field program designed to evaluate sediment amendment using the Pneumatic Flow Tube Mixing Apparatus (PFTM) in NY/NJ Harbor. These activities were completed to determine the appropriate field mixing conditions during the July- August 2015 pilot demonstration of the PTFM. It is a novel technology originally developed in Japan for high rate amendment of dredged material for use in man-made islands. The increased rate of processing and uniformity of the stabilized sediment mixture led the New Jersey Department of Transportation (NJDOT) to support a Rutgers University Center for Advanced Infrastructure and Transportation (CAIT) pilot scale field demonstration of the PFTM system in Newark Bay. This effort will evaluate the applicability of PTFM for stabilization of the loose and contaminated sediments native to the Bay for later beneficial use in structural and fill applications. In April 2015 100 gallons of raw dredge material was acquired from the Arthur Kill adjacent to the CME Inc. waterfront. The location is the site of the subsequent dredging operation that will provide sediment for the field scale pilot test. The material was allowed to settle and then was decanted to approximately the water content that will present during PTFM operations. The material was then stabilized with Portland cement at 5 different dosages and 3 different initial moisture contents. The samples were then tested for flowability, short term strength gain using the laboratory vane shear apparatus, and long term strength gain using the Unconfined Compressive Strength Test and the Needle Penetration Test.
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