還原碴是電弧爐煉鋼過程中還原期所產生之工業副產品，早期多被認定為工業廢棄物。然而，由於還原碴的成分與組成和卜特蘭水泥以及常用的卜作嵐材料(飛灰、水淬爐石粉等)相當接近，故具有作為膠結材料替代水泥之潛力，現今多朝資源化再利用作為混凝土材料的方向進行研究，而非單純視為工業廢棄物來進行處置。
為了達到提升還原碴去化量與減少水泥用量之目的，本研究將以還原碴作為膠結材料替代水泥，並找出最佳還原碴水泥配比設計，且利用添加鹼活化劑之方式提升去化量及改善膨脹行為。所製備的砂漿試體則透過抗壓、熱壓膨脹、凝結時間和微觀分析等試驗項目，探討還原碴細度變化、還原碴用量與水膠比用量等應用方式，對砂漿試體的工程特性影響之差異，評估還原碴作為膠結材料取代水泥，製備成還原碴水泥的最佳應用方式和最佳配比。
從研究結果中可得知，無論以何種方式作為砂漿試體的膠結材料，隨還原碴用量增加，對強度發展與膨脹行為等都有負面影響，還原碴水泥之還原碴用量建議以膠結材料重量百分比的20 %為上限。而還原碴的細度變化則對強度發展趨勢與膨脹行為無嚴重的影響。在添加鹼活化劑的應用方式中，經過鹼活化劑之添加，膨脹行為可以大幅改善，且在替代量提升中可發現细度增加可以提升抗壓強度與降低膨脹量，添加鹼活化劑後替代量可達40 %(细度5000cm2/g的條件下)，為極具潛力的膠結材料應用形式。

Bacuse the composition of Ladle furnace slag (LFS) is fairly similar to Ordinary Portland cement (OPC), it has the potential to be the bonding material or admixture for concrete. Therefore, instead of simply seeing it as a waste, recent studies focus mainly on recycling and reuse. In order to eliminate LFS and reduce cement consumption, this study will be divided into three parts to discuss the feasibility of LFS reutilization for cement and the improvement of expansion behavior: (1) Analysis of the basic characteristics of LFS and the relationship between grinding fineness and engineering properties, (2) Discussion on the relationship between water-cementitious material ratio (W/CM), LFS replacement cement dosage and engineering characteristics, and (3) Making alkali-activated cement mortar to explore the improvement of expansion behavior and compressive strength. After the above three parts of the results, we can get the best design of mix proportion of a group of blended cement of Ladle furnace slag and Ordinary Portland cement. The design of mix proportion of this group is evaluated by CNS 15286 to determine that the ratio meets the standards of hydraulic cement. According to the results, excessive LFS can have a negative impact on engineering performance, such as strength development, volume stability, and the like. And through the research results, the best ratio design is: LFS raw material over #30 sieve fineness is 1200 cm2/g, cement replacement amount is 20 wt%, water-cementitious material ratio (W/CM) is 0.485. According to the results of alkali-activated cement mortar, it is known that the addition of cement mortar to alkali-activated chemicals can effectively improve the expansion behavior, but the addition of an excess of alkali activator will lead to the negative impact of strength development, and the study found that FLS can be regarded as Alkali activators are used.

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