垃圾焚化之後空污系統會蒐集大量的焚化飛灰，由於含有大量的有害物質不易處理，因此如何穩定甚至再利用將是一個重要的課題。焚化飛灰經過高溫熔融處理後產生的熔渣擁有穩定的化學性質以及適合的物理強度，因此適合作為水泥砂漿之粒料。
本研究通過篩分析，發現熔渣的粒徑主要聚集於1.18~4.75mm區間，20BA、30BA、50BA、30GL的細度模數分別為4.17、4.31、4.22、4.43，遠大於CNS法規規定的2.3~3.1，綜合上述兩組數據得知熔渣粒徑是要大於法規規定細粒料粒徑的。
將細粒料以光學顯微鏡拍攝，以軟體進行面積、周長、最長Feret直徑、最短Feret直徑測量，計算出粒料的長寬比、圓度來比較其形狀發現，熔渣的長寬比會隨著粒徑變小而增加，而中白石與標準砂並無此現象，中白石的長寬比大約與大粒徑的熔渣相近，而標準砂的長寬比則較小。無論是熔渣、中白石、標準砂的粒徑都沒有對其圓度有顯著的影響，標準砂有最小的圓度，熔渣的圓度則最大。綜合2個形狀指標得知熔渣的形狀是較中白石標準砂不規則的。
本研究於固定水膠比、骨膠比等配比的情況下，將熔渣以替代率25%、50%、75%、100%的比例替代水泥砂漿細粒料。流度方面少數組別有略微下降，但是大部分的都是提升的。抗壓強度部分所有的組別均是符合CNS 78的抗壓強度標準，大部分組別為替代率越大抗壓強度越低的趨勢，其中20BA與50BA在替代率25%時呈現抗壓強度下降的情況。密度則是替代熔渣後有略微上升，而30GL的上升幅度較其他三種熔渣要小。
以田口法探討水膠比、骨膠比、粒料種類與替代率的影響。綜合S/N比（信號/誤差比）和變異數分析可得知，水膠比對流度有最大的影響，水膠比越大流度越高，骨膠比次之，骨膠比越小流度越大，其餘兩項參數影響不大。抗壓強度在1天齡期時水膠比有絕對的影響力，水膠比越小抗壓強度越高，28天齡期時則是粒料的性質為主導，替代率越高抗壓強度越低。
總結來說，本研究透過熔渣替代水泥砂漿細粒料，發現水泥砂漿的抗壓強度與流度均符合法規的要求值，因此初步判斷其可以再利用於混凝土的建材，達成永續發展的目的。

After waste incineration, the air pollution system will collect a large amount of incineration fly ash. Since it contains a large amount of harmful substances and is difficult to handle, how to stabilize and even reuse it will be an important issue. The slag produced by incineration fly ash after high-temperature melting treatment has stable chemical properties and suitable physical strength, so it is suitable as a pellet for cement mortar.
Through sieve analysis in this study, it was found that the particle size of molten slag was mainly concentrated in the range of 1.18~4.75mm, and the fineness modulus of 20BA, 30BA, 50BA, and 30GL were 4.17, 4.31, 4.22, and 4.43, which were much larger than the 2.3 specified by the CNS regulations. ~3.1, based on the above two sets of data, it is known that the particle size of slag is larger than the particle size of fine granular material specified by regulations.
The effects of water-binder ratio, bone-binder ratio, pellet type and replacement rate were investigated by Taguchi method. Based on the S/N ratio (signal/error ratio) and variance analysis, it can be known that the water-cement ratio has the greatest influence on fluidity, the greater the water-cement ratio, the higher the fluidity, followed by the bone-cement ratio, and the smaller the bone-cement ratio The larger it is, the other two parameters have little effect. The water-binder ratio has an absolute influence on the compressive strength at the age of 1 day. The smaller the water-binder ratio, the higher the compressive strength. At the age of 28 days, the properties of the pellets dominate, and the higher the replacement rate, the higher the compressive strength. lower.
To sum up, this study found that the compressive strength and fluidity of cement mortar meet the requirements of the law by substituting slag for cement mortar fine-grained materials. Therefore, it is preliminarily judged that it can be reused as a building material for concrete to achieve sustainable development purpose.

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