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: 25kg. (Approximately 25litres)

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.

Application:

Bentonite Enhanced Cement Grout.
The subject of composition and chemistry of bentonite enhanced cement grout is vast. This activated sodium bentonite power is offered without recommendation as an enhancement to cement and lime based grouts

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

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Quick Contact:
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Logistics: ( See also Information / Delivery)
This product option is supplied packed in safe and easy to handle weatherproof packs stacked on a wooden pallet. Packs are stretch wrapped onto the pallet for added protection and security.

Pallets are delivered by national couriers and off-loaded onto a level hard-standing using vehicle tail-lift and pallet truck. Our couriers do not offer a crane (Hiab) off-load facility.

Pallet deliveries by national couriers are not advised for locations with narrow or difficult access. Please advise during checkout or contact our office for advice if you have specific delivery requirements or concerns.

Failed deliveries due to problems with access which as not been pre-notified will be returned to our warehouse and charged for both outward and return delivery,

The immediate product wrapping, pallet stretch wrap and wooden pallet can all be recycled.

Specify: Sodium Bentonite Clay Grout from Specialist Aggregates.