CASE STUDIES 2017-10-10T11:48:27+00:00
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Versatile bentonite for public sector and private sector projects in Kent and the UK

Bentonite (Manufacturing & Supply) Ltd is a trusted provider of bentonite materials. Working with industries across the UK, we help you complete all jobs to the highest standards. With reliable equipment, we are able to supply a variety of private and public sector clients with premium materials suitable for a wide range of domestic, commercial and industrial applications.

Balfour Beatty Utility Solutions Limited

  • Main contractor: Balfour Beatty Utility Solutions Limited
  • Location of works: Tata Steel (Shotton Steel Works) Zone 4 Deeside Industrial Estate CH5 2NH
  • Description of works: In filling cable ducts under roads and paths and rivers
  • Length of ducts: 4485 linear metres (over 8 visits)
  • Volume: 126m3
  • Mix: The mix required a thermal resistivity of 1.2 Km/W. (mix design as supplied by Prysmian Group.) To ensure that all material was batched correctly sand, cement and bentonite mixture was pre-blended and supplied in 25 kg bags and 1 ton sacks.
Project details
National Grid and Scottish Power Transmissions have come together in a joint venture to build the Western Link, a £1 billion project which will help renewable energy from Scotland to homes and business in Wales and England. Construction of the Western Link is being carried out by a consortium of Siemens and Prysmian.
Mix used
The mix required a thermal resistivity of 1.2 Km/W. (mix design as supplied by Prysmian Group.) To ensure that all material was batched correctly sand, cement and bentonite mixture was pre blended and supplied in 25 kg bags and 1 ton sacks.
How the project was completed
Most of the cables were laid on sand then covered, however at certain locations the Contractor had to have directional drill rigs in to bore under roads, paths and rivers. Once the bore was completed a duct was inserted, then the electric cables were pulled through. Bentonite (Manufacturing & Supply) Limited were tasked to infill all the ducts with a sand, cement bentonite slurry.
Bentonite (Manufacturing & Supply) Ltd supplied two different machines to manufacture and pump the material. Prior to infill the cable ducts were wrapped with Densoseal 16A (as required in the specification) a 25 mm MDPE pipeline was inserted in to both ends for an injection and vent, then the ducts were filled at each end with a rapid hardening material to prevent leakage when being in filled. Our grout master pump was connected to the injection pipeline.
The sand, cement and bentonite dry mixture was mixed with pre weighed pre-blended 25 kg plastic bags in to the mixing tank which held 200 litres of material. Once thoroughly mixed it was pumped out via 25 mm ID rubber hoses which were connected to the MDPE injection line.
When the material started to ooze from the breather end (which was caught in a 25 litre container so not to contaminate the ground) the pumping was stopped and the breather hose was doubled over and held with plastic ties. The pump line was then removed from the injection line and reconnected to another duct which requires infilling.
Our 1 m3 mixer was filled with a 1 ton bag of blended material when mixed it was discharged in to the rear of a concrete lorry, once 4 m3 had been batched the truckmixer was driven to the location where the ducts required infilling.
A SP11 grout pump was attached to the injection pipeline of the duct via a 25 mm MDPE connection. Once all was ready the truckmixer discharged in to the hopper of the grout pump and the slurry was pumped in to the duct. Once material was expelled from the vented end (which was caught in a 25 litre container so not to contaminate the ground) the breather hose was doubled over and held with plastic ties. The pump line was removed from the injection line and reconnected to another duct which required infilling.
Equipment used
A grout master for making bentonite sand cement slurry for small volume using 25 kg bags.
A 1 m3 mixer was used to fill a truckmixer which delivered the material across the site at various locations.

GCL Camden

Due to a ruptured fuel tank from a garage, the soil in the garden of the care home had to be removed and then a trench was created to be in filled with bentonite to create a slurry wall. This wall was to ensure that any further contamination would be held back by the bentonite.

  • Main contractor: Ground Construction Limited
  • Location of works: Camden Care Home, Wellesy Road, Camden, NW5 4PN
  • Volume: 100 m3
Mix used
The material used for this project was a blend of cement bentonite and GGBFS (slag) supplied in 25 kg bags.
How the project was completed
The contractor removed the contaminated soil and inserted sheet piling around the area where the ruptured tank was. A trench was excavated down to the clay around part of the garden and plastic was laid inside of the trench where the steel piles were, this being the deepest end some 3 metres in depth. The plastic allowed the steel piles to be extracted once the trench was in filled with bentonite, without causing a problem to the slurry wall once set.
The bentonite was mixed via 25 kg bags in a mixing tank which held 4 m3 of material. Once thoroughly mixed it was pumped out via 50 mm ID rubber hoses to the trench.
The project was completed over a period of 2 days.
Equipment used
A 4 m3 mixing tank with a 30 KVa generator.

Soilfix

Remediation of a 6 hectare parcel of heavily contaminated land, historically a chemical works, fuel depot and scrap yard. Bentonite (Manufacturing and Supply) Ltd was asked to create a 350 linear metre cement bentonite slurry cut off barrier around the foreshore of Tipner Lakes (an adjacent RAMSAR /SSSI) prior to ongoing remediation works.

  • Main contractor: Soilfix Limited
  • Location of works: Portsmouth
  • Volume: 1100 m3
Mix used
A special blend of cement slag (GGBFS) and bentonite. To achieve a minimum permeability of 1 x 10-9 with a minimum strength of 100+ KPa after 28 days.
How the project was completed
A trench was dug around the 350 metre long perimeter. A maximum depth of 7.0 metres below ground level with a daily run of 20-30 linear metres based on Bentonite (Manufacturing & Supply) Limited supplying in highly challenging and poor ground conditions.
Equipment used
The equipment used on this project was our bespoke batching unit that could mix 16 m3 in one batch, a 25 ton silo with a 300 KVa generator and 75000 litre water tank.

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