Utilisation Of Two-stage Waste Incinerator
Bottom Ash As A Cement Substitute In Concrete
Author(s)
F. Kokalj & N. Samec
Abstract
Waste incineration still seems to be an essential technology in the concept of
integrated waste management. However, the desirable quantity of waste
incineration residue needs to be as low as possible. Therefore, related
optimization of two-stage waste incineration technology has been performed
with the main goal of producing lower amounts of boiler ash, fly ash and flue
gas-treatment residue, all classified as hazardous waste. Most of the combustion
residue should be incinerator bottom ash. Tests were performed on light fraction
of municipal solid waste in a two-stage pilot scale waste incineration plant.
The goal of this investigation is to present utilisation possibilities of waste
light fraction incineration bottom ash as a cement substitute in concrete. The
produced incinerator bottom ash, formed in the primary chamber of the twostage
incinerator, was analysed, tested and compared to other incinerator bottom
ashes and cement. High resemblance of investigated bottom ash to cement was
determined compared to other bottom ashes. Compressive and flexural strength
and slump test were performed to characterise incinerator bottom ash and cement
mixtures in concrete. It was found that after 28 days the flexural and
compressive strengths of the binder linearly gradually decreases. The results
show that it is possible to substitute 15 wt% of cement where low strength
concrete is required.
Keywords: incinerator bottom ash, waste incineration, two-stage incinerator,
concrete.
1 Introduction
Municipal waste – although classified as non-hazardous – still causes air, water
and soil pollution during its decay when deposited in landfills without proper
Keywords
incinerator bottom ash, waste incineration, two-stage incinerator,
concrete.
Related Book
Other papers in this volume
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