鍋爐衍生灰渣特性分析及再利用於混凝土製品之實驗評估

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題名:	鍋爐衍生灰渣特性分析及再利用於混凝土製品之實驗評估
作者:	林宸毅;Lin, Chen-Yi
貢獻者:	土木工程學系
關鍵詞:	飛灰;底灰;高壓混凝土地磚;透水混凝土地磚;CLSM
日期:	2020-07-17
上傳時間:	2020-09-02 14:23:32 (UTC+8)
出版者:	國立中央大學
摘要:	本研究主要針對設有燃燒輔助燃料鍋爐之造紙廠及染整廠，將鍋爐衍生灰渣材料進行特性與資源化再利用技術之可行性研究。依廠內使用現況選定三種鍋爐衍生灰渣:（1）漿紙污泥混燒灰、（2）廢棄物衍生燃料(Refuse-derived fuel,RDF)混燒灰（3）木顆粒灰。另外取用電廠飛灰進行比較，依據上述四種材料之飛灰及底灰，進行土木材料相關之物理性質及化學性質基本試驗，探討其材料之特性。從基本特性實驗結果得知，漿紙污泥混燒飛灰(PSFA)燒失量高達14.8%，矽鋁鐵氧化物總含量為48.3%，以20%wt.取代水泥28天強度活性指數仍可達80%；RDF混燒飛灰(RDFFA)則具有金屬鋁之化學成分，與水泥摻配後，有膨脹現象發生影響致使強度活性指數僅為68%；木顆粒飛灰(WPFA)則是因含有木質磺酸鈣與磷酸鹽類，與水泥摻配時，致使初凝時間為415分鐘。漿紙污泥混燒底灰(PSBA)、RDF混燒底灰(RDFBA)以及木顆粒底灰(WPBA)，SSD比重與視比重差異可達0.18至0.34，其中又以WPBA最為明顯，表示該底灰有較多之孔隙。本研究將資源化再利用的方式應用於:（1）控制性低強度回填材(CLSM)、（2）高壓混凝土地磚與（3）透水性混凝土地磚。CLSM中PSFA與WPFA以100%體積取代CFA以及PSBA與WPBA以50%體積取天然細粒料時28天抗壓強度可達規範標準20kgf/cm2以上；高壓混凝土地磚試驗結果上顯示WPFA作為填充材以體積取代20%天然細粒料使用，抗壓強度已降至27Mpa，僅可達B級磚標準，在使用時須審慎評估；當PSFA應用於透水混凝土地磚以100%體積取代細粒料時，調整水灰比至0.27時，可保有一定的抗壓強度與透水性能。;This research aims at the derived fly ash and bottom ash which are produced by co-firing coal and waste materials for recycling use, and assess the properties of these waste and the feasibility of their reuses. According to the current status of the domestic boiler plant, three types of ashes are selected: (1)Paper sludge ash (PS), (2)Refuse derived fuel ash (RDF),(3)Wood pellets ash (WP). In order to evaluate the potential of the co-combustion fly ashes as pozolanic material for replacement of cement, the physical and chemical properties of these ashes were experimentally determined and compared with the pulverized fly ash (FA) produced from power plants burning pure coal. From the characteristic experiment results that the PSFA’s loss on ignition is 14.8% and the total content of silicon aluminum iron oxide is 48.3%. when it replacing cement with 20%wt. 28 days strength activity index can reach 80%.When the RDFFA has the chemical composition of aluminum. After mixing with cement, the expansion phenomenon will affect the strength activity index to only 68%.WPFA has calcium lignosulfonate and phosphate,when it mix with cement ,the initial setting timeis 415 minutes. PSBA,RDFBA and WPBA difference between SSD specific gravity and apparent specific gravity can reach 0.18 to 0.34, among which WPBA is the most obvious,it means that the WPBA has more pores. In this the method of resource reuse is applied to: (1)Controlled low strength materials(CLSM) and (2)Compressed concrete paving units (3) Permeable concrete paving blocks.The results of CLSM PSFA and WPFA replace CFA with 100% by volume and PSBA and WPBA replace natural fine aggregate with 50% by volume the 28days compressive strength can reach more than 20kgf/cm2 of the standard. The test results of compressed concrete paving units show that WPFA is used as a filler to replace 20% of natural fine aggregate by volume and the compressive strength has been reduced to 27Mpa, which can reach the standard of grade B bricks and must be carefully evaluated when used. When PSFA is applied to permeable concrete paving blocks to replace fine particles with 100% volume,W/C is adjusted to 0.27, it can maintain a certain compressive strength and water permeability.
顯示於類別:	[土木工程研究所] 博碩士論文

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