抄録
In this study, we developed the device to remove unburnt carbon from fly ash that applied flotation method, and experimentally examined the operating condition of the device. After we scaled up to the full scale device, we experimentally examined strength properties of concrete with fly ash removed unburnt carbon by it. According to the results, it was effectively able to removed unburnt carbon from fly ash by the device that installed micro bubble nozzles and a whirl type pump. The removal efficiency of unburnt carbon improved when prior forced stirring was carried out by a concrete mixer for 30 minutes, and scavenger in fly ash slurry of about 60 wt% in the density was added to. The compressive strength of concrete with fly ash slurry that removed unburnt carbon by the full scale device showed a tendency similar to the concrete with fly ash as specified in JIS A 6201 class II.
