Method of treating marine sediments and use of the resulting solid product in mortars or concretes
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United States of America Patent
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Feb 28, 2012
Grant Date -
Aug 4, 2011
app pub date -
Sep 29, 2009
filing date -
Oct 17, 2008
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Abstract
A method of treating marine or river dredging sediments, especially harbour zone sediments, whose free water content is between 40% and 80% by weight, for the purpose of obtaining a solid material which is easy to handle, includes the following successive steps: mixing the sediments with a treatment composition including a sulphoaluminate binder and at least one other component selected from a sulphate source and a catalyst of the hydration reactions of the sulphoaluminate binder; a step of setting of the mixture, leading to a compact mixture having a free water content of less than 20% by weight; then fractionating the compact mixture. The sediment thus treated may be incorporated into concrete or mortar formulas, which then have leachable fractions of less than 1% by weight.
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