Effects of Amendment Materials on Cement-Solidified Contaminated Marine Sediments—Mechanical Stability and Leaching of Heavy Metals

    Volume 6, Issue 4 (April 2009)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 3 April 2009

    Page Count: 13


    Kvennås, M.
    NGI Trondheim Office, Trondheim,

    Sparrevik, M.
    NGI Main Office, Oslo,

    Grini, R. S.
    NGI Trondheim Office, Trondheim,

    (Received 8 October 2008; accepted 24 February 2009)

    Abstract

    Stabilization/solidification technology (S/S), in which contaminated marine sediments are mixed with cement and other binding agents have shown to be a promising remediation technique. The major advantage of S/S over other contaminated sediments remediation techniques is that dredged material can be transformed from a soft material into a filling material with favorable geotechnical properties. Reduced contaminant transport from the treated material is achieved simultaneously. This paper summarizes a study investigating how amendments (additions) may improve the mechanical properties and reduce leaching of heavy metals of two cement-stabilized marine harbor sediments from the cities of Bergen and Hammerfest, Norway. The deployed amendments comprised granulated blast furnace slag (Merit®), cement kiln dust, fly ash, gypsum, sand, iron sulfide, and microsilica. The use of amendments was observed to improve the strength of cement-stabilized soft and wet sediments, where the use of granulated blast furnace slag (Merit) resulted in the greatest inprovement. Cement stabilization resulted in a reduced leaching of lead, whereas the leaching of copper and chromium from Hammerfest sediments increased substantially. In order to achieve the lowest total net transport of contaminants through the material, S/S recipes for environmental projects should not only be optimized with regard to physical strength, but also with regard to leaching and permeability.


    Paper ID: JAI102146

    DOI: 10.1520/JAI102146

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    Author
    Title Effects of Amendment Materials on Cement-Solidified Contaminated Marine Sediments—Mechanical Stability and Leaching of Heavy Metals
    Symposium Fourth Symposium on Contaminated Sediments: Sustainable Management and Remediation, 2009-07-03
    Committee D18