電弧爐還原碴（EAF ladle slag），化學組成富含Ca、Si元素，與水泥、高爐石相似，然因含f-CaO，當做為工程材料應用時，有健性不穩定之問題。本研究首先應用鹼活化程序安定化還原碴，並以鋁粉（Al powder）做為發泡劑，探討不同條件下鹼活化還原碴之發泡特性，將其製作成不同密度之試體，再與市面上常見之防火、隔熱、隔音建材做功能比較，評估鹼活化還原碴發泡漿體製作制熱工程材料之可行性。
研究結果顯示，鹼活化程序能克服還原碴健性不穩定之問題，使其在熱壓膨脹試驗後長度變化量低於0.2%，符合規範所規定之0.8%。且還原碴具有C2S等低水化熱之礦物，能改善鹼活化應用於工程上所遇到之速凝問題。經研究發現鹼活化還原碴發泡漿體製作過程：（1）水膠比（W/B）從0.3提高到0.6，漿體的相對坍流度從141%升高到350%，密度從1000 kg/m3降低到530 kg/m3，平均發泡孔徑從0.38 mm擴張到0.77 mm；（2）鹼模數比（Ms）上升時，會導致產氣量從210 mL下降到133 mL，進而讓密度從595 kg/m3上升到1184 kg/m3，同時孔徑也會從0.71 mm縮小到0.35 mm；（3）含鹼當量（Na2O%）增加時，發泡產氣速率增快進而造成漿體有塌陷之現象，亦即含鹼當量從4%提高到6%時，密度會從595 kg/m3上升到810 kg/m3，而提高至7%則會出現嚴重的塌陷，孔徑分布也會變得非常不均勻；（4）穩泡劑中的活性劑SDBS可以有效的分散並穩定氣泡之結構，使平均孔徑0.9到0.71 mm的大孔縮小至0.60到0.42 mm，而穩泡劑中的增稠劑三仙膠可以增強泡沫壁之強度，讓漿體密度從595 kg/m3上升至670 kg/m3以及抗壓強度從0.98 MPa上升至1.34 MPa。綜上而言，加入調質穩泡劑後可得最佳控制參數為W/B = 0.3~0.45、Na2O% = 4%、Ms = 1.25~1.75、發泡劑為0.2 wt.%，依此控制參數可產製四種不同密度（600、800、1000以及2000 kg/m3）的制熱工程材料。密度較低的制熱工程材料有較為良好之隔熱效果；密度較高者有較好的機械強度以及良好的隔音效果。此外制熱工程材料具有良好之防火能力。
制熱工程材料具備優於水泥混凝土及市售岩棉的防火性能，且隔熱效果為一般混凝土的3倍，而其隔音性能優於隔音岩棉。且環境相容性方面則皆可符合法規標準。防火方面，岩棉背溫高達155.9℃，制熱工程材料背溫約為63℃，且相較於卜特蘭I型水泥（OPC）與岩棉之噴燒面均出現破損不完整，制熱工程材料則保持完整，顯示制熱工程材料在防火性能上的優勢。隔熱方面，制熱工程材料之熱傳導係數約為0.5 W/m∙k為OPC的三分之一（1.61 W/m∙k）。隔音方面，密度為2000 kg/m3的制熱工程材料隔音效果優於水泥，且減噪≧30 dB，而密度較低者其隔音性能仍優於市售常見之隔間填充材岩棉。亦即，鹼活化還原碴產製之制熱工程材料具有隔熱、防火、隔音性能及環境相容性，為一具發展潛力之綠色工程材料。

This study used alkali-activated technology to stabilize electric arc furnace ladle slag (EAF ladle slag) and manufacture heat-suppression materials with EAF ladle slag. Since EAF ladle slag has a similar chemical composition to blast furnace slag and cement, it seems like a pozzolan material. However, ladle slag is inappropriate to be a pozzolanic material as the soundness of ladle slag cannot meet regulations due to ladle slag containing free-MgO (f-MgO) and free-CaO (f-CaO). Alkali activated technology can transform the f-MgO and f-CaO of ladle slag into Mg(OH)2, Ca(OH)2 or calcium silicate hydrate (C-S-H gel) at the beginning of hydration reaction ensuring the soundness of ladle slag meets the specification. With urbanization becoming more and more rapid, human life is heavily dependent on air conditioning. In light of this, if our building has excellent thermal insulation performance of and fireproof, we can save a lot of energy. In order to produce heat-suppression materials, we add foam agent in this system to let alkali-activated concrete become alkali-activated aerated concrete. After we added the foam agent in this system, we manufactured heat-suppression materials with different density and lower thermal conductivity compared to traditional cement which means it has better thermal insulation performance. In addition, heat-suppression materials also have better fireproofing and sound insulating performance than mineral wool. Heat-suppression materials are suitable for the manufacture of composite functional building materials such as heat insulation, fire prevention, and sound insulation.

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