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Coal-fired power station ash used on level and surface areas



PERIOD: 2007 - 2009

BUDGET: € 618,868.00

R+D+i project to study the characterization and use of ash from coal-fired power stations on level and surface areas, whether alone or combined with slag from blast furnaces, hydraulic agglomerates and hydrocarbon bonding.

The aim of this project is to take advantage of certain wastes from coal-fired power stations as an additional component to be used in the construction sector. This provides added value in itself while decreasing the problems faced from the environmental management point of view, as it reduces emissions as well as the waste derived from later treatments.

Currently, electrical power plant ash is generally used as an additive in the preparation of cement and concrete. The annual production of this waste has been estimated at 9 metric tons/yr, of which, approximately 63% is recycled.

One of the main advantages of using ash in the construction sector is that this sector would be able to absorb, if necessary, the full waste volume generated. This contrasts with the modest amounts required for the various methods used to date, including the manufacturing of additives for cement and concrete, production of artificial aggregates and heat resistant materials. Likewise, it could be used, untreated, in the construction of pathways, railways, pavements and filling.

The fields of interest would be linked to the validation of the material in the following scenarios:

  • Construction of level areas.
  • Stabilizers for highway and parking grounds.
  • Gravel for ground base or sub-base.
  • Filler for asphalt mixtures.