焼却灰を混合したセメント系へどろ固化処理土の強度特性と重金属の溶出特性に関する研究

概要

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The purpose of this study is to clarify the possibility of incinerate ashes as hardening additives which affect the cement treatment of hedoro. The three kinds of incinerate ashes, i.e. the fluidized bed combustion coal fly ash, the pulverized coal fly ash and paper sludge ash, are used as hardening additives. The leaching characteristics of heavy metals from cement treated hedoro were investigated by using an X-ray fluorescence spectrometer. As a result, it is found that the strength of the hedoro mixed with cement stabilizer and incinerate ashes have been increasing during aging period. The fluidized bed combustion coal fly ash including large quantities of SO_3 and CaO works effectively as hardening additives. However, the pulverized coal fly ash and paper sludge ash takes no recognizable effect on the strength of treated hedoro. The main reaction products which contribute to strength are ettringite and calcium silicate hydrate compound. The observation by an X-ray fluorescence spectrometer is effective to measure the quantity of heavy metals leaching from cement treated hedoro. According to leaching tests, only chromium is measured from various treated soil by using ion exchange filter, however, it is the subject for a future study to determine the quantity of harmful six-valent chromium.
明石工業高等専門学校の論文