Associated Manufacturers

Contact us

Get quote

Marconite

Marconite

Marconite – Electrically Conductive Aggregate Material

Earthing Compound

Marconite is the world’s premium electrically conductive aggregate material – the synthetic material is manufactured specifically for use in earthing applications and unlike Bentonite, it is not a naturally occurring mineral or ore.

Marconite enables electrical earthing system designers and installers to achieve permanent, stable and low resistance earthing solutions, even in difficult ground conditions when used as a backfill to enhance the effects of copper earth electrodes or earth rods.

Specifically developed and manufactured for the needs of the earthing industry, Marconite has allowed engineers for over 40 years to tackle the toughest conditions and achieve the satisfactory earthing of installations including substations across the globe.

Dark grey in colour and of a granular consistency, Marconite earthing replaces traditional sand and aggregate materials. The mix ratios should be 3 parts of Marconite to 1 part cement by weight with the addition of 1 litre of water per 4 Kg of total mix. For example:

  • 3 x 25 Kg bags of Marconite
  • 1 x 25 Kg bag of Cement
  • 25 litres (25 Kg) of Water

When mixed as described above Marconite forms a relatively dry material with an ‘as poured’ density of around 1300 Kg / m³. The water content may be adjusted as the application requires but this will affect the concretes final compressive strength and the drying times accordingly. Typically, Marconite concretes are touch dry within hours but can be several days before being fully cured.

Marconite

Marconite is also available in the form of a ‘premix’ – this is a standard 25 Kg poly sack which contains pre-weighed amounts of Marconite and cement powder in the correct ratio to form the preferred concrete.

With the addition of 5 litres of water each bag can then be mixed independently and used without the need to carry additional cement powder.

MARCONITE – THE BENEFITS

  • Low resistivity : 0.001 ohm.m is extremely low (Bentonite 3 ohm.m)

    Marconite

    Marconite is a granulated electrically conductive aggregate which replaces sand in mixes with cement, thereby providing electrically conductive concrete.

  • Versatile : suits most ground conditions and becomes a permanent, solid structure that it is not prone to shrinking, drying out or being washed away
  • Cost effective : permanent solution with no need to remove and replace or ‘maintain’ periodically with additional water / salts in order to achieve the desired earth values
  • Chemically inert : Marconite is non-corrosive to steel or copper, does not attack cement structures and has a pH within the neutral range
  • High strength : can be used as part of the building structure itself and achieve strengths higher than Grade 25 concrete
  • Easy to use : forms a concrete like material achieving a low resistance earth, no need to wait or return to test

What Makes Marconite Unique?

Other earthing materials marketed as conductive aggregates include low grade carbonaceous by-products from other industries which include coal, metallurgical coke, power station clinker, carbon black, Bentonite and others. All of these products can be called conductive with resistivity of 5 ohms metres.

The resistivity of Marconite is in the order of .001 ohm metres. When mixed with cement the resulting conductive concrete is still only 0.19 ohm metres.

This is significantly lower than Bentonite for example, which has a typical resistivity of 3 ohms metre upwards.

Typically the above products can include anything between 15-20% impurities which are corrosive and will corrode earth connections resulting in the loss of the system which can prove to be very, very expensive.

The compound has no such impurities and at PH7 is non corrosive and is manufactured specifically for earthing, it is not a by-product.

Calculating Volume Of Marconite Required 

Table 1 – Weight Quantity in kilograms (kg)

Depth (cm) Hole Length & Width
10 x 10cm 20 x 20cm 30 x 30cm 40 x 40cm 50 x 50cm 60 x 60cm 70 x 70cm 80 x 80cm 90 x 90cm 100 x 100cm
10 10 20 30 40 50 60 70 80 90 100
20 20 40 60 80 100 120 140 160 180 200
30 30 60 90 120 150 180 210 240 270 300
40 40 80 120 160 200 240 280 320 360 400
50 50 100 150 200 250 300 350 400 450 500
60 60 120 180 240 300 360 420 480 540 600
70 70 140 210 280 350 420 490 560 630 700
80 80 160 240 320 400 480 560 640 720 800
90 90 180 270 360 450 540 630 720 810 900
100 100 200 300 400 500 600 700 800 900 1000

Table 2 – Bag Quantity in amount of 25kgs bags required

Depth (cm) Hole Length & Width
10 x 10 cm 20 x 20 cm 30 x 30 cm 40 x 40 cm 50 x 50 cm 60 x 60 cm 70 x 70 cm 80 x 80 cm 90 x 90 cm 100 x 100 cm
10 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4
20 0.8 1.6 2.4 3.2 4 4.8 5.6 6.4 7.2 8
30 1.2 2.4 3.6 4.8 6 7.2 8.4 9.6 10.8 12
40 1.6 3.2 4.8 6.4 8 9.6 11.2 12.8 14.4 16
50 2 4 6 8 10 12 14 16 18 20
60 2.4 4.8 7.2 9.6 12 14.4 16.8 19.2 21.6 24
70 2.8 5.6 8.4 11.2 14 16.8 19.6 22.4 25.2 28
80 3.2 6.4 9.6 12.8 16 19.2 22.4 25.6 28.8 32
90 3.3 7.2 10.8 14.4 18 21.6 25.2 25.8 32.4 36
100 4 8 12 16 20 24 28 32 32 40

Example: So a 100 x 100cm hole (1 cubic metre) would need 40 bags of Marconite PREMIX to fill it completely. Assuming there are no other components in the hole absorbing some of the volume of the hole.

Application 

Marconite and Earthing of Towers

Towers used for power distribution, lighting and communication aerials are usually supported on foundations with each leg on an individual concrete base or all legs on a reinforced concrete slab. Earthing is traditionally completed with earth electrodes using conventional earth rods or tapes.

A. Marconite conductive concrete has a resistivity of 0.1 ohm metre.

B. Marconite can be placed as a blinding layer when excavating the foundations and connected by copper tape to the tower.

C. Bore holes are not required thereby reducing drilling and copper costs.

D. By incorporating a blinding layer with the foundation block the area available is considerable when compared to a single electrode, enabling the resistance required to be achieved.

Marconite and Earthing of Substations

Substations are earthed to contain any fault current within their boundaries.

At the perimeter Bore Hole with Marconite is constructed all around i.e if 20Mtr Bore Hole is done – then next one will be done at 20Mtr distance. This is done all around the perimeter.

A 100mm dia bore hole with a 16mm copper rod encapsulated with Marconite has a large area of dissipation that will ground any fault current faster and more safely when compared to a 16mm dia rod.

SUBSTATION EARTHING & MV HV CABLE JOINTING

To complement Earthing & Lightning Protection products.