CARBONACEOUS BACKFILL

Carbonaceous backfill or earth contact backfill is used to surround buried impressed current cathodic protection anodes. The backfill increases the effective size of the anode giving a lower resistance to earth and is consumed at a predictable rate from the current discharge.

PML supplies two principal Backfill types:

Metallurgical Coke Breeze for use in horizontal and shallow vertical groundbeds

Coke breeze is porous and provides a large volume to weight ratio, decreasing the resistance to earth delivering a large volume for a long life groundbed. Coke Breeze can be supplied with a slaked lime addition to reduce moisture loss.

Calcined Petroleum Coke for use deepwell or borehole groundbeds

Calcined petroleum coke with small spherical grains is suitable for deepwell applications as it enables to escape and with a surfactant addition it can be mixed with water to create a slurry which can then pumped into the borehole. With a high bulk density the petroleum coke sinks to the bottom of the hole.

Typical Chemical Analysis

Physical Characteristics

*Material will compact in transit. Bulk Density figure stated can vary by plus or minus 10%

Packaging

Backfill is supplied in 25 kg poly bags, stacked on pallets and shrink wrapped. Also available in 1 tonne bulk bags.