都市垃圾焚化飛灰性質複雜，其中重金屬如鉛、鎘、鉻、銅及鋅，大部分均超過TCLP之溶出標準，目前多採固化後進行最終處置。但固化後體積增大，且重金屬有再溶出之疑慮，因此穩定飛灰中有害物質及進行再利用處理技術為未來趨勢。都市垃圾焚化飛灰之主要成分是鈣、矽、鋁、鐵之氧化物，具有回收再利用的價值。前人研究可將飛灰經過熔融處理後，取代部分水泥生料；亦有研究指出研磨有穩定重金屬之效果，因此本研究嘗試將飛灰水洗研磨，探討重金屬穩定，以及取代部分水泥原料資源化之可行性。 本研究利用壓汞孔隙測定儀、X 光繞射分析、掃描式電子顯微鏡及固態核磁共振光譜儀之分析，探討水洗飛灰重金屬穩定特性，以及替代水泥之成效與水化反應機制，了解研磨飛灰取代水泥之可能性。 研究結果發現研磨飛灰的重金屬溶出濃度大部份都相當低，甚至低於偵測極限。研磨時間96 hr所製成的研磨飛灰水泥漿體，其抗壓強度無論在各個水灰比以及養護齡期之下，皆略大於未經研磨之飛灰水泥漿體與市售水泥漿體。其原因為研磨飛灰水泥漿體之孔隙<0.01μm的分布比純水泥漿體高出許多，致使抗壓強度發展快速，以及研磨飛灰水泥漿體之聚矽陰離子長度較純水泥漿體小，因此形成較為緻密的膠體空間，增強水化反應之效果。 The major constituents of the MSWI fly ash are calcium, silicon, aluminum and iron etc; they are almost the same as the feedstock of cement. The MSWI fly ash recovery as a cement substitute not only to solve the cement raw materials using but also conform to the concept of sustainable use. In this study four aspects were discussed: (1) comprehend the characteristic of MSWI fly ash; (2)confer the influence of the parameters of hydration to milling fly ash replace cement; (3)confer the mechanism of the reaction of pozzolanic of milling fly ash replace cement; (4) confer the influence of leaching of heavy metal. The results indicated that：(1) The compressive strength of adding milling 96hr fly ash cement is higher than adding milling 0hr fly ash cement and ordinary portland cement of any W/C and age. (2) The TCLP leaching concentrations for the heavy metals (Cd, Pb, Zn, Cr, Cu) were all well below the regulatory thresholds. (3) The hole of adding milling fly ash is <0.01μm account compressive strength develop fast.(4) The C-S-H of adding milling fly ash is shorter than ordinary portland cement account have closeness space.
