Bentonite slurry is a thick, gel-like mixture made by blending Bentonite powder with water. It is commonly used in construction, piling, diaphragm walls, tunneling, and drilling to support the soil and prevent collapse during excavation. The slurry forms a protective layer that stabilizes the sides of the borehole or trench.
How Bentonite Slurry is Prepared
1. Mixing with Water
Clean water is taken in a tank or mixing pit. Bentonite powder is slowly added into the water while continuously stirring to avoid lumps.
2. Proper Hydration
The mixture is allowed to rest so that Bentonite can absorb water and swell completely. This hydration increases viscosity and gel strength.
3. Mechanical Agitation
High-speed mixers, slurry pumps, or agitators are used to achieve a smooth and uniform consistency.
4. Testing & Adjustment
The slurry is tested for:
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Density
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Viscosity
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Sand content
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Gel strength
If needed, more water or Bentonite powder is added to achieve the desired strength for the specific construction use.
Typical Ratio
Although it varies by application, a common preparation formula is:
4–6% Bentonite powder mixed with clean water
(about 40–60 kg Bentonite per 1000 liters of water)
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