Slurry walls
play an important role in rebuilding levees.
Slurry walls are designed to prevent water from seeping through levees. These walls play an important role in building construction, especially when the water table is very high. Slurry walls limit the horizontal flow of water. They allow dams to be more stable. Slurry walls are especially helpful when a levee breaks, since they can serve as a temporary barrier until the levee can be rebuilt. In addition to helping improve the levee or dam barrier, the slurry is also used in waste treatment systems to prevent wastewater from seeping into the ground and contaminating it.
Bentonite
Slurry walls are used in construction situations where soil is wet and unstable, according to PGH Bridges. Slurry walls are made either out of soil bentonite or cement bentonite. Bentonite is a clay material that is very capable of resisting water passage thanks to its thickness, according to North Carolina State University. Clay is made out of particles that are thicker, so the water has a more difficult time flowing through gaps in these particles. This bentonite wall slurry provides temporary support when the slurry is poured into the trench, according to Cement.org. When working with bentonite, precautions should be taken since the dust created from the bentonite is bad for the lungs.
Slurry Making
A slot is excavated where the bentonite slurry will eventually be poured to create the slurry wall. The bentonite slurry is put into a slot using guide walls. Sometimes the slurry only has water and bentonite. Other times, the bentonite-water combination has cement added to it right before pouring the bentonite slurry into the slot, according to Cement.org. In addition to being used for levees and wastewater barriers, slurry walls are necessary for excavating, since they prevent water from seeping into the excavation from the water table. After the land is excavated, the slurry wall is displaced by adding dry bentonite and other soils to the slurry. The bentonite slurry tends to move away from the area where the dry bentonite is added, allowing the excavators to push the bentonite slurry wherever they want it to go, according to Geo-Solutions. In the case of levees and wastewater barriers, the slurry wall is left alone as a barrier with no dry bentonite added.
Slurry Digging
The slurry cutoff wall is sometimes constructed using a backhoe that can be modified to dig 80 feet deep or more. Other kinds of equipment used include a clam-shaped digging tool or a hydromill trench cutter, according to Geo-Solutions. Slurry walls must go very deep so that floods do not enter through the water table. Therefore, the slurry must be able to stop or slow water flow on the water table.
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