轉爐石乃是一貫作業煉鋼廠之主要副產物，每年中鋼約產出150萬公噸，由於轉爐石含有游離氧化鈣，吸水後形成氫氧化鈣，導致轉爐石體積膨脹，而且浸泡後之溶液pH值較高，應用於混凝土結構物或堆置掩埋處理，皆將引起耐久性及環境相容性之疑慮。由於傳統卜作嵐水泥之製作過程，高耗能且排放大量二氧化碳，可能造成地球暖化及環境生態之衝擊，故亟需研發新型無機聚合物以取代卜作嵐水泥。一般無機聚合物之製作程序，需添加鹼金屬氫氧化物及鹼金屬矽酸鹽混合溶液共同激發，雖然可製成具高抗壓強度之膠結材，但所選用鹼金屬氫氧化物及鹼金屬矽酸鹽激發劑之成本昂貴。本研究利用轉爐石浸泡於水中形成高pH值鹼液之特性，於不添加其他任何鹼激發劑情況下，激發富含鋁矽酸鹽礦物之廢棄物，經由適當攪拌條件，所製成轉爐石無機聚合膠結材試體之最佳抗壓強度可高達50MPa以上，另外，經由適當養護條件，所製成轉爐石無機聚合砂漿試體之最佳抗壓強度則可達45MPa。最後，藉由一系列試驗結果，探討轉爐石溶出之鹼量、攪拌條件及試體養護條件等，對所製成轉爐石無機聚合物試體抗壓強度及耐久性之影響。

The annual amount of BOF slag, which is the by-product of an integrated steel work, can reach about 1.5 million tons in Taiwan. Free-CaO contained in BOF slag usually reacts with water to form calcium hydroxide Ca(OH)2, leading to the expansion of its volume, the formation of microcracks in a brittle binder and the possible failure of a structural component. Meanwhile, the OH- concentration of the solution containing BOF slag is high and could be harmful to the surrounding environment. As a result, the durability and environmental compatibility problems caused by the use of BOF slag in a concrete structure and landfill are of concern. At the same time, a novel construction material for the replacement of traditional Portland cement with high energy consumption and carbon dioxide emission in manufacturing is needed and urgent. In the study, BOF slag is used as a raw material in the production of inorganic polymers with low energy consumption and carbon dioxide emission. The solution of BOF slag with the characteristic of a high pH value, utilized as an activator without the introduction of sodium hydroxide and sodium silicate, was mixed with some aluminosilicate minerals to produce alkali-activated inorganic polymers. The dissolution of aluminium and silicon ions from aluminosilicate minerals can be accelerated and becomes complete in a short time by mixing them with the activator without sodium hydroxide and sodium silicate at high temperatures for various durations. The inorganic slurry after vigorously stirring was then cured at high temperatures for lasting different time to enhance the polycondensation reaction and the resulting microstructure and properties of alkali-activated inorganic polymers. It is found that the compressive strengths of alkali-activated BOF-slag inorganic binders and mortars could reach up to 50 and 45MPa, respectively. Also, the expansion of the alkali-activated inorganic polymers caused by BOF-slag can be effectively reduced if adequate curing temperature and time are employed for the preparation of specimens. Based on the experimental results, the effects of the hydroxide concentration in activators without sodium hydroxide and sodium silicate, aging temperature and duration and curing temperature and time on the compressive strengths and durability of alkali-activated BOF-slag inorganic polymers are evaluated here.

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