| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 96 === Coal fly ash is generated from the air-pollution control devices of coal-burn electric-generation plants. Because the producing amount is huge day by day, and non-hazardous, coal fly ash has already changed into a additive industrial waste into a mineral additive of concrete, to improve the defect of the traditional concrete. The nature of the coal fly ash is influenced by the coal source, system of burning, operating conditions and environmental factor etc, resulted in a unstable quality and various appearent color of coal fly ash. This research focused on the effect of different washing reagent on physico-chemical property of washed ash. In this study, for the ashes were collected from the coal-fired and oil-fired plants. Results indicate that the washing treatment actually improves the compression strength of acetone-washed ash concrete by 15 kg/cm2, and reduces the oil content. In addition the residual percentage of <#500 mesh sieve has increased to be 15~20%. The economic analysis also illustrated that acetone is a better washing reagent that water for coal fly ash.
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