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Sodium Bentonite Grout - Collect
Product Code: 6090

3+ 6+ 
Price per pack£30.60£28.20£26.40


Total £30.60recalculate total
Inc VAT and delivery*

Sodium Bentonite Clay. Provides high penetration and low permeability characteristics to grouts for thermal and water wells, placing borehole instrumentation, and with lime for void fill to walls in historic buildings.

Pack size: 10kg. (Approximately 10litres)

Product Size: Powder

Description & Sourcing:
Bentonite is a variety of clay which is predominantly composed of the mineral Montmorillonite. The clay is thought to be a product derived from the decomposition of volcanic ash, and is worked from licensed deposits located in the USA, Greece and Turkey. This Sodium based clay is generally known as a "swelling clay" due to the ease with which it takes up water and its ability to form low permeability thixotropic gels.


The bredth of composition and chemistry of bentonite enhanced cement grout, and cement filled bentonite grout is vast. This activated sodium bentonite power is offered without recommendation.

Bentonite Enhanced Cement Grout.
Bentonite is a very tolerant material that will provide for a wide range of thixotropic mixes with a range of viscosities, and has applicability with OPC and slag based cements, as well as traditional lime mortars and sand filled mixes.

When used for setting geo-technical instrumentation in boreholes the addition of bentonite to a cement grout will provide enhanced properties over a cement only grout in that it will improve penetration and resistance to wash-out, whilst reducing permeability and overall increasing cement hydration time.

Whilst the thoroughness of mixing and effective pumping will have a significant effect on grout quality, it is the water/cement ratio that determines the ultimate strength of the grout. To achieve accurate mixing ratios it is important that water and cement are mixed first with the bentonite clay being added as a third component.

A wide range of cement/grout ratios are used for an equally wide variety of applications. Lean mixes with as little as 5% (by weight) of bentonite will decrease shrinkage and bleeding of water from cement grouts typically used for placing borehole casings, whilst mixes containing up to 40% (by weight) of bentonite can be mixed to carry high water contents for low strength, high water/cement ratio grout for placing bore instrumentation through soft soils.

Cement Filled Bentonite Grout.
Bentonite clay can be used either as a "stand alone" grout or with a proportion of cement utilised as a filler/extender. Typically mixes comprise (by weight) two parts bentonite to one part cement. The effect of the addition of cement is to stabilise the bentonite suspension. Mixes tend to be used for sealing landfill gas wells and to isolate horizons within exploratory drilling.

Appearance: Beige free flowing powder.
pH: 9-10

Specify: Sodium Bentonite Clay Grout from Specialist Aggregates.

Orders placed for personal collection: You will be advised your collection reference by e-mail. For personal collection orders placed by telephone (01 889 580660) our staff will be able to provide an immediate collection reference.

Personal collection is from: Specialist Aggregates, Unit 5 Rydal Estate, Colton Road, Rugeley, Staffs WS15 3HF.

Collection Logistics: Aggregates will be supplied in easy to handle recyclable plastic packaging. Rocks and boulders will be supplied loose. Products will be loaded as appropriate by hand or using mechanical means into customer's vehicles.

Personal collection times: Monday to Friday 10.00 am to 12.30pm – 2.00 pm to 4.30 pm. Price quoted for this item relates to personal collection only. Extra-over charge for collection by customer arranged courier £15.60 per pack (inc VAT).

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