流動床石炭灰の防塵処理と地盤改良への適用

抄録

Evaluation of a dust prevention method for fluidized bed combustion coal fly ash and its applicability to geo-materials such as road construction or ground improvement are discussed. The coal fly ash generation as a by-product from fluidized bed combustion system is expected to increase significantly, because the use of this system has been spreading widely as independent means of electric power generation in some industries due to its technical merits. Though it has the advantage of containing lime and gypsum for hardening utilization, the coal ash is too dusty to utilize as geo-materials. In order to promote the utilization of the coal ash, “Non-Dusty Method” by using waste oil is proposed. The effect of the method on dust decrease was evaluated, and strength development and oil leachate characteristics, of both compacted coal ash and soft clay or waste sludge stabilized by the coal ash, were estimated experimentally. The results show that coal ash treated by the “Non-Dusty Method” can be effectively utilized as road materials or soil stabilizer without dust pollution during the execution. Therefore it can realize the treatment and potential utilization of not only the coal ash but also surplus soil and waste slurry or sludge generated from foundation works in large quantities.