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Title: | 焚化底渣/氟化鈣污泥之共同熔融結晶化熔渣之特性及其資材化研究 Characterization and Reutilization Study on Crystallized slags from Co-Melting processed incinerator ash/Calcium Fluoride sludge |
Authors: | Chang-Hua Chou 周常華 |
Advisor: | 李公哲 |
Keyword: | 底渣,污泥,熔融,糝料,卜作嵐性質, bottom ash,sludge,melting,admixture,pozzolan, |
Publication Year : | 2007 |
Degree: | 碩士 |
Abstract: | 本研究利用高溫爐熔融技術,將垃圾焚化底渣與氟化鈣污泥進行共同熔融處理,並由加熱結晶化冷卻的方式所得的到的熔渣作為取代水泥/細骨材以達到資材化之目的,並探討熔渣本身之卜作嵐性質及其對混凝土之性質之影響。本實驗總共分成三階段,第一階段尋求共同熔融熔渣之最低熔流溫度;第二階段為熔渣基本性質分析;第三階段則是熔渣取代部分水泥/細骨材,利用各種試驗,如抗壓試驗、MIP、SEM、DSC、NMR等分析,討論熔渣資材化之相關性質。
實驗結果顯示,當焚化底渣/氟化鈣污泥配比為7:3,其鹽基度(CaO/SiO2)為0.542時,具有最低之熔流溫度1060°C,所得到的熔渣為部份晶質,成份與C級飛灰接近,為卜作嵐材料。水泥取代部份,以3%取代抗壓強度最大;骨材取代率則可達40%,但並非取代率越高則有較好的抗壓性,基本上仍有賴最適合配比的水化反應與卜作嵐反應相作用,同時,考慮工作流度因素,還以細骨材取代率應低於30%,雖然卜作嵐反應對增加抗壓強度有正面結果,但相對於水化的持續反應,卜作嵐材料仍有其極限,此可由DSC分析中看出CH隨著時間減少量並不大。至於NMR可得知水泥混凝土中聚矽陰離子的鍵結隨著養護期越長而增加,且取代率越大有越明顯之趨勢。再就,加熱結晶化冷卻方式得到之熔渣與水冷及氣冷熔渣加以比較,顯示結晶化熔渣之單位容積重可達2736 kg/m3,比水冷及氣冷大,可見結晶體結晶密實 進一步,評估細骨材取代率,則顯示結晶化熔渣在抗壓強度上,遠優於水冷熔渣與氣冷熔渣,但與氣冷熔渣相較,則差異並不顯著,但水泥結晶化熔渣用來取代部分水泥時,可顯著增加後期抗壓強度,尤其與水冷熔渣相較,則具有相當之優勢。 The purpose of the research was to study the effects of high temperature co-melting slags producted from municipal solid waste incineration bottom ash and industrial calcium fluoride sludge,and to utilize the crystallized slags obtained by cooled by air, re-heated and temperatured controlled to reach the destination of reutilization .Experiments were conducted to (1) determine the lowest pouring temperature of co-melting ash and sludge at various proportions.(2) analyze the physical and chemical characteristics of the pulverized slags,such as specific gravity,particle size,chemical composition,TCLP,XRD patterns and strength activity index (SAI). (3) incorporate the slags as mineral admixtures in the cement-based composites materials in place of a fraction of the cememt,and evaluate the concerned characteristics by compressive strength、MIP、SEM、DSC、NMR,etc. The results showed that the lowest pouring temperature was 1060。C when the co-melting ash and sludge were blended in the ratio of 7︰3,and the value of basicity was 0.542. It was observed that the crystallized slags was crystallized which was closed to class C fly ash belonged to pozzolan. could be used as pozzolan closed class C fly ash. 3% replacement of cememt,and 40% replacement of aggregate could produce highest compressive strength.The high compressive strength could be obtained through the hydration and pozzolanic reaction in the optimal ratio,but the replacement of aggregate should be lower than 30% due to the workability. Althought pozzolanic activity is benefitial to compressive strenght,is also limited by the hydration. It was observed that the CH did not decrease apparently with time in the analysis of DSC. It also demonstrated that the length of polysilicate bond increased with the curing time in the concrete by NMR,and the trend is more distinct with higher replacement. Moreover,the specific gravity of crystallized slags could reach 2736 kg/m3 was greater than that of water-cool and air-cool slags which asserted the degree of crystallization.The crystallized slags had the greater compressive strength than that of water-cooled and air-cooled slags,even the outcome compared with the air-cool is not apparently.Comparing to water-cooled slags,it had the better advantage because crystallized slags utilized to replace part of cement would increase the compressive strength in the later curing stage. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/29483 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 環境工程學研究所 |
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