Fly ash

Fly ash is a product from coal-fired power stations and should not be mixed up with fly ashes from waste incineration plants or residues from other combustion processes.

The starting material of fly ash is domestic or imported coal. It is produced when the finely ground coal is burned in the power station at over 1,200 °C. The mineral dust grains of the secondary rock contained in the coal mainly melt. They are carried in the flue gas flow and are separated out in the electric filters of the power station for further use as a construction material. Fly ash essentially consists of silicon, aluminium and iron oxides, the main components of the earth's crust.

In 1995, EN 450 was published with requirements for the properties of "fly ash for concrete". It was officially introduced as a certified concrete additive in 1996. Use as an additive for in-situ concrete or concrete for load-bearing construction members is comprehensively defined according to EN 206-1 and DIN 1045-2 (also applies to fly ashes with national technical approval of the Deutsches Institut für Bautechnik (DIBt)). Certified fly ashes fulfil the construction materials criteria and the DiBt environmental and health compatibility requirements.

Use of fly ash spares natural resources, saves energy which would be required for the preparation or manufacture of comparable construction materials (1t SFA as concrete additive saves 1 t CO2) and therefore contributes to sustainable environmental protection.

With efficient partners, large silo capacities at strategically favourable locations and a perfected logistics system, we are capable of ensuring continuous delivery to our customers at home and abroad.

Coal-fired power station

Coal-fired power station