8/25/2023 0 Comments Dredged define106, 330–341 (2016)Ĭantré, S., Saathoff, F.: Investigation of dredged materials in combination with geosynthetics used in dike construction. 29(4), 270–278 (2007)Īziz, M., Ghorbel, E., Bibi, M.: The possibility of using dredging sludge in manufacturing cements: optimization of heat treatment cycle and ratio replacement. 26(10), 1865–1875 (1992)Īgostini, F., Skoczylas, F., Lafhaj, Z.: About a possible valorisation in cementitious materials of polluted sediments after treatment. Results revealed that the substitution of 20% of sand volume by Gabes channel sediments provided a concrete with higher compression strength than reference one.Īdams, W.J., Kimerle, R.A., Barnett Jr., J.W.: Sediment quality and aquatic life assessment. Based on its characteristics, this material could be reused in concrete formulation. Sediment from Gabes harbor is the second investigated sample. The experimental results showed the feasibility of Zarzis sediment with 3% lime addition in road applications in base-course material. The mechanical tests of various formulations conducted on different mixtures are compaction and compression. Sediment extracted from the first study area, Zarzis commercial harbor, was reused as a new material for road construction. The second part, deals with two different applications of marine sediment dredged from two Tunisian harbors. Possible sediment reuse in civil engineering applications are classified according to material proprieties. The choice of alternative reuse is based on geotechnical, mechanical, chemical, mineralogical and environmental characterization of marine sediment. In the first part, a literature review of sediment reuse is presented. This works is divided into two main sections. Physical, mechanical, chemical, mineralogical and environmental properties of dredged marine sediments define the possible civil engineering applications according to standards. Thus, laboratory identification is an essential step in sediment management. Sediment characteristics are the primary decision maker in choosing the adequate valorization way. Indeed, various reuse ways have been studied such as road construction, clays bricks, cementitious materials and paving blocks. Nowadays, dredged sediment reuse in civil engineering applications become more and more a beneficial tool for waste material management. After dredging, marine sediment are either discharged at sea or disposed in lands. Environmental Protection Agency provides oversight and authorization for the disposal of dredged materials.Huge amounts of dredged marine sediments are generated periodically in order to maintain waterways and ensure ships navigation. Army Corps of Engineers issues permits for the disposal of dredged material the U.S. The disposal of dredged material is managed and carried out by federal, state, and local governments, as well as by private entities such as port authorities. NOAA's Office of Response and Restoration plays a major role in protecting and restoring marine natural resources when environmental damage occurs. These pollutants are introduced to waterways from point sources such as sewer overflows, municipal and industrial discharges, and spills or may be introduced from nonpoint sources such as surface runoff and atmospheric deposition. This environmental dredging is often necessary because sediments in and around cities and industrial areas are frequently contaminated with a variety of pollutants. Since massive ships carry the bulk of the goods imported into the country, dredging plays a vital role in the nation's economy.ĭredging is also performed to reduce the exposure of fish, wildlife, and people to contaminants and to prevent the spread of contaminants to other areas of the water body. This water depth continues to increase over time as larger and larger ships are deployed. Vessels require a certain amount of water in order to float and not touch bottom. It is a routine necessity in waterways around the world because sedimentation-the natural process of sand and silt washing downstream-gradually fills channels and harbors.ĭredging often is focused on maintaining or increasing the depth of navigation channels, anchorages, or berthing areas to ensure the safe passage of boats and ships. Dredging is the removal of sediments and debris from the bottom of lakes, rivers, harbors, and other water bodies.
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