Slurry Walls
Providing a barrier against pollution and water migration
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Slurry Walls
This is a civil engineering concept that involves building a wall in the ground, sometimes many metres deep, in areas of soft earth close to open water or with a high ground water table.
The material is used to prevent the migration of water, hydrocarbons and gas (on landfill sites) from one side to the other.
The slurry wall trench has to be dug down to the clay level, so when the liquid slurry is pumped in it makes a bond between the clay in the trench. This stops any seepage of water or contaminates moving through the ground.
B.S. states the following permeability for slurry walls:
“A target permeability of less than 1×10-9 m/s is required. However, due to inherent variability of trench mixes, sampling and testing, at least 80% of results shall be less than 1×10-9 m/s and at least 95% of the results shall be less than 1×10-8 m/s, with no individual result in excess of 5×10-8 m/s, when measured in apparatus and tested at an age of 90 days or such later age as specified in the Particular Specification.”
Based in Kent but working throughout the UK, Bentonite Manufacturing & Supply Ltd can offer a self-hardening material for the infilling of slurry walls which give a strength of 450-600+ Kpa at 28 days and a minimum permeability of 1×10-9 m/s – normal results are around 1 x 10-10 m/s after 28 days. This material can also be used for secant piles and also for infilling underground tunnels and by tweaking the mix can increase strengths.
Results
Below are the Triaxial permeability results on a sample of grout supplied to a slurry wall poured on the 13/02/23 tested on 13/03/23 (28 days).
Description: Stiff intact dark green cement bentonite slag SLURRY
| Sample Details: | Initial: | Final: |
|---|---|---|
| Diameter: | 102.2 mm | 102.1 mm |
| Height: | 98.8 mm | 98.7 mm |
| Moisture Content: | 291 % | 296 % |
| Bulk Density: | 1.18 Mg/m³ | 1.19 Mg/m³ |
| Dry Density: | 0.30 Mg/m³ | 0.30 Mg/m³ |
| Sample Condition: | Undisturbed |
Saturation Stage: (Saturation by increments of cell pressure and back pressure)
| Initial pore pressure coefficient, B: | 0.61 |
| Final pore pressure coefficient, B: | 1.00 |
| Duration of stage: | 10 days |
Consolidation stage:
| Drainage condition: | Double end drainage |
| Effective pressure: | 100 kPa |
| Duration of stage: | 1 day |
Permeability stage:
| Pressure difference across specimen: | 20 kPa | |
| Mean effective stress: | 100 kPa | |
| Duration of stage: | 2 days | |
| Coefficient of permeability at | 20°C | 4.2 x 10-11 m/s |
Case Studies
Find out more about some of the recent projects we have completed, both in our local area of Kent and for clients across the UK.
East Sussex
Details: The site for this particular project was alongside the River Adur near Shoreham Harbour, next to a scrapyard that was the reason for the slurry… Read more
Kent
Details: Bentonite (Manufacturing & Supply) Ltd was approached by I.D. Corcoran Contractors Ltd for advice on the infill of decommissioned steam and cable tunnels, along with… Read more
Cleethorpes
260m3
Details: Bentonite (Manufacturing & Supply) Ltd was asked to infill three cable ducts with diameters of 800mm with a 250mm cable insert for wind farms located… Read more
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