What is a bentonite slurry?

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asked Apr 30 in Maintenance/Repairs by 88rigspooner (860 points)
What is a bentonite slurry?

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answered Apr 30 by Kingcarter240 (1,870 points)
In construction a bentonite slurry is a mixture and combination of bentonite and slurry and the bentonite slurry is  a thin and also sloppy mud or cement or, in extended use, any fluid mixture of a pulverized solid with water, often used as a convenient way of handling solids in bulk.

Slurry in construction is a cement slurry which is a runny form of concrete that is poured into forms for molding.

To make a slurry mixture for construction a mixture of sand, cement, water and sometimes lime, cement slurry can be used for residential construction as well as commercial projects to create foundations, pour slabs and driveways and more.

The WTC or World Trade Center Slurry Wall is the 3-foot-thick (91 centimeters), below-ground, concrete structure surrounding the World Trade Center which was designed to keep the World Trade Centers basement levels from being flooded by the Hudson River which remained in place.

Slurry Walls are used for building reinforced concrete walls in areas of soft earth that is close to any open water or close to areas with high groundwater tables.

A slurry wall is a civil engineering technique that is used to build reinforced concrete walls in areas of soft earth close to open water, or with a high groundwater table.

This technique of a slurry wall is typically used to build diaphragm walls surrounding tunnels and open cuts, and to lay foundations.

Soil-Bentonite (SB) slurry walls are the most common type of slurry wall.

These walls were sporadically used in the United States between the 1940’s and 1970’s after which their use became commonplace.

Thousands of these walls have been constructed in a number of purposes.

For this type of wall, the permanent backfill is a blend of soil and bentonite clay that is placed in a high slump condition.

The high slump backfill is placed through the slurry to serve as the final barrier wall. In the US, the SB slurry wall technique is used far more frequently than any of the other slurry trench construction methods (cement-bentonite or soil-cement-bentonite).

The slurry wall is typically excavated with a long reach excavator under a bentonite water slurry.

The slurry stabilizes the excavation without the need for conventional shoring.

This allows the excavation to proceed to almost any depth, even well below the water table. Long reach excavators designed for slurry trenching are capable of digging down to depths of around 90 ft (26 m).

Clamshell excavators may be used to go even deeper.

Once the trench is completely excavated, a blend of soil excavated from the trench, dry bentonite, borrow soils, bentonite slurry and any other necessary additives are mixed at the surface and placed into the trench by a bulldozer or second excavator.

The mixture is placed in a semi-fluid state which allows it to flow into the trench and displace the trench slurry.

When the backfill operation is complete, the SB backfill consolidates slightly and behaves like a soft clayey soil.

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