Effects of Co-Combustion of Secondary Fuels on Fly Ash Quality

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Title: Effects of Co-Combustion of Secondary Fuels on Fly Ash Quality

Author(s): F. J. M. Lamers, J. L. J. Vissers, and J. W. van den Berg

Publication: Special Publication

Volume: 199

Issue:

Appears on pages(s): 433-458

Keywords: alternative fuels; co-combustion; concrete; durability; fly ashes; leaching; mortars; regulations; strength development

Date: 6/1/2001

Abstract:
In the Netherlands the government allows the co-combustion of a maximum of 10% of secondary fuels together with coal. To show whether the quality of fly ashes is affected by co-combustion, a broad research program was performed in which both the technical and the environmental quality of concrete with fly ashes from co-combustion were evaluated in comparison to the quality of concrete with reference fly ashes. In the research program, fly ashes from co-combustion of sewage sludge, paper sludge, pet cokes, several types of biomass and a type of liquid hydrocarbon were evaluated. Both the technical and the environmental quality of most ashes from co-combustion were shown to be comparable to that of regular fly ashes. As a result of the outcomes of the research program the Dutch regulations for fly ash as a filler or part of the cementitious material were adjusted to make utilization of fly ashes from co-combustion possible. European legislation is in preparation.