臺灣博碩士論文加值系統

CFBC飛灰、水淬高爐石粉及粉煤飛灰均為工業發展所產生的副產品，添加作為礦物摻料或取代水泥皆可減少原物料的使用，有效利用工業廢棄物並能降低水泥的用量，達到國家永續利用之目標。緣此，本研究擬以既有的研究成果為基礎並參考國內外相關之研究文獻，探討將CFBC飛灰、水淬高爐石粉及粉煤飛灰，依不同比例取代水泥製成砂漿試體，評估添加礦物摻料對砂漿新拌性質、物理性質、力學性質、耐久性與微觀特性之影響。
試驗結果顯示適量添加CFBC飛灰有助於改善水泥質材料的流動性，其中以取代水泥10%效果最佳；添加過少的水泥及水淬高爐石粉會造成凝結時間變長，水淬高爐石粉添加量為60%時可有效減少凝結時間；適量添加粉煤飛灰與爐石粉亦可抑制因CFBC飛灰可能帶來的膨脹問題，其中粉煤飛灰以取代20%效果最好，爐石粉以取代40%較果最佳；當CFBC飛灰添加量為20%以下及粉煤飛灰取代量為20%以下時，抗壓強度較佳，水淬高爐石粉則不限制，可有效的取代水泥；增加水泥取代量可以增加抗硫酸鹽，當水泥取代量低於40%時，水淬高爐石取代量要高，否則容易造成損壞；單獨以CFBC飛灰取代水泥10%時，可發現其存在許多細長針管狀或細長針管交織狀的鈣釩石水化物，這也是其會造成膨脹的原因。當以CFBC飛灰及粉煤飛灰混合各取代水泥10%時，可發現其含有鈣釩石與未完全水化的飛灰顆粒。

Circulated Fluidized Bed Combustion Technology (CFBC) fly ash, Ground Granulated Blast-Furnace Slag (GGBFS) and Coal Fly Ash (CFA) all belong to the industrial by products. Using them as the mineral admixtures in concrete can effectively reduce the amount of cement and sustainable construction can be achieved. Based on this, the mixture proportion of CFBC fly ah, GGBFS and CFA in mortar mixtures are examined to evaluate their influences on the properties of fresh mortar, and physical properties, mechanical properties, durability and micro-scale properties of harden mortar.
Experimental results showed that adequate amount of CFBC fly ash increased the flowability of cement paste especially for the group with the replacement percentage of cement being 10%. While the amount of cement and GGBFS was insufficient, the setting time became longer. When the replacement percentage of GGBFS was 60%, the setting time could be effectively reduced. Adequate amount of CFA and GGBFS could inhibit the expansion problem from CFBC fly ash. For CFA, 20% replacement percentage had the best performance while for CFBC fly ash 40% replacement percentage had the best performance. When the replacement percentage of CFBC fly ash was lower than 20% and the replacement percentage of CFA was lower than 20%, the compressive strength became higher. For GGBFS, it can effectively replace cement without reducing the compressive strength. When the replacement percentage of blended mineral admixtures (using CFBC fly ah, GGBFS and CFA at the same time) was higher, the capability to resist sulfate increased. While the replacement percentage of blended mineral admixtures was lower than 40%, the amount of GGBFS should be high in order to prevent possible damage. When the replacement percentage of CFBC fly ash was 10%, needle shape ettringite was observed which explained the reason of expansion. When the replacement percentages of CFBC fly ash and CFA were 10%, nonreactive fly ash powder and ettringite were found.

中文摘要 I
Abstract II
第一章　緒論 1
1-1　研究背景與動機 1
1-2　研究目的 3
1-2　研究方法與流程 3
第二章　文獻回顧 5
2-1　前言 5
2-3　水淬高爐石粉生成與成分 8
2-4　粉煤飛灰生成與成分 9
2-5　鹼激發 9
2-6　國內外有關本計畫之研究情況 11
第三章　試驗計畫 15
3-1　試驗材料 15
3-2　試驗變數與配比 17
3-3　試驗方法 21
3-4　試驗設備及儀器 24
第四章　結果與分析 29
4-1　流度試驗結果 29
4-2　凝結時間試驗結果 31
4-3　吸水率試驗結果 33
4-4　吸水速率試驗結果 35
4-5　長度變化試驗結果 38
4-6　抗壓強度試驗結果 42
4-7　抗拉強度試驗結果 46
4-8　抗彎強度試驗結果 50
4-9　掃描式電子顯微鏡試驗結果 53
4-10　X光繞射分析試驗結果 64
4-11　抗硫酸鹽健性試驗結果 69
第五章　結論與建議 73
5-1　結論 73
5-2　建議 74
參考文獻 75

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