煉鋼爐渣之轉爐石（basic oxygen furnace slag，BOF slag）與脫硫渣（desulfurization slag，DS slag）含有鈣、矽等物質應具有作為高壓蒸氣養護氣泡混凝土（autoclaved aerated concrete，AAC）替代原料之潛力。本研究以氧化鈣（CaO）、二氧化矽（SiO2）、卜特蘭水泥（Portland cement）作為原料，並以鋁粉（Al powder）作為發泡劑，控制原料配比及漿體製作條件，配合高壓蒸氣養護程序，以其製品特性歸納製作AAC之最適原料成分與高壓蒸氣養護條件，並以轉爐石與脫硫渣調質作為AAC之替代原料，探討其製品特性、晶相組成與微觀結構，評析上述煉鋼爐渣再利用於AAC之可行性。
研究結果顯示，磁選分離程序可使轉爐石與脫硫渣之非著磁部分富含Ca、Si元素，進而提高作為AAC替代原料之潛力，漿體製備則可藉由調整拌合水量（水固比，W/S）與鋁粉劑量控制成型漿體之密度，其中以改變水固比方式最具成效，而AAC製品密度大致不受蒸氣壓力與養護時間所影響，因此可藉由調製漿體控制AAC製品密度。由AAC製品特性、熱重分析、晶相組成與水化物微觀結構歸納最適原料配比與高壓蒸氣養護程序，以原料組成SiO2 = 70 wt.%、CaO = 25 wt.%、水泥5 wt.%之乾基配比於蒸氣壓力12 atm、養護時間16小時條件下所得之AAC製品具有最佳抗壓強度6.59 MPa，可符合AAC-4（4.0 MPa）與AAC-6（6.0 MPa）標準規範，密度為673 kg/m3，兼具輕質特性。
以轉爐石與脫硫渣非著磁部分作為AAC替代原料，調控水固比及改質漿體更可使替代比例提高。其中轉爐石替代比例15 wt.%、水固比0.75 L/kg與替代比例30 wt.%、水固比0.60 L/kg之AAC製品可分別符合AAC-2（2.0 MPa）與AAC-4（4.0 MPa）標準規範。在脫硫渣方面，使用NaOH(aq)鹼性水溶液改質漿體具有快速簡便且其AAC製品具備質輕高強度等優點，替代比例20 wt.%與40 wt.%可分別符合AAC-4與AAC-2之標準規範。此外，觀察AAC製品之晶相組成與水化物微觀結構可發現托伯莫萊土（tobermorite，Ca5(OH)2Si6O16•4H2O）水化物生成，而tobermorite可貢獻AAC製品之強度發展，因此由製品特性、晶相組成與微觀結構可知轉爐石與脫硫渣應適合再利用於AAC製造。

Basic oxygen furnace slag (BOF slag) and desulfurization slag (DS slag) are by products of steel-making processes. These slags contain large amounts of Ca and Si, so that they have the potential using in the production of autoclaved aerated concrete (AAC). This research firstly uses lime (CaO), quartz (SiO2), and Portland cement as raw materials with Al powder as expansion agent to produce AAC, and determines the appropriate proportions of the raw materials and suitable autoclave curing procedure. In addition, this study reuses BOF and DS slags as raw materials in AAC production.
The results show that the non-magnetic BOF and DS slags contain large amounts of Ca and Si, which are suitable for AAC raw materials. It is noticed that the density of AAC is mainly determined by water to solids ratio (W/S) and Al powder amount, especially W/S. Moreover, the autoclave curing time shows no significant influence on the density of AAC. Based on the characteristics of AAC products, the optimal proportion of raw materials is SiO2:CaO:cement = 70:25:05, and the suitable autoclave curing procedure is under 12-atm saturated steam pressure for 16 h. With such preparation conditions, the AAC products have highest compressive strength (6.59 MPa), which can meet the AAC-6 (6.0 MPa) and AAC-4 (4.0 MPa) standards.
In terms of reusing BOF and DS slags in AAC production, it is noticed that the replacement ratio of slag can be increased by controlling the W/S values or conditioning the AAC pastes. When the replacement ratios of BOF slag are equal to 15 wt.% and 30 wt.%, and the W/S values are controlled at 0.75 L/kg and 0.60 L/kg, the AAC products can meet the AAC-2 (2.0 MPa) and AAC-4 (4.0 MPa) standards, respectively. In terms of DS slag, increasing the alkalinity of AAC pastes by NaOH(aq) has some advantages, including easy operation and high compressive strength per unit density. When the replacement ratios of DS slag are equal to 20 wt.% and 40 wt.%, the AAC products can meet the AAC-4 and AAC-2 standards, respectively. Furthermore, it is found the tobermorites (Ca5(OH)2Si6O16•4H2O) form in AAC products, such as plate-like and lath-like tobermorites could enhance the compressive strength. According to above research results, it can be concluded that utilization of BOF and DS slags as raw materials to produce AAC is feasible.

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