電弧爐還原碴 (EAF ladle slag)，化學組成富含Ca、Si元素，但因含f-MgO與f-CaO，作為工程材料應用時，有健性不穩定之虞。本研究應用鹼活化程序提供一高化學能，期能增加還原碴之反應性以克服健性不穩定之問題，並探討鹼活化還原碴砂漿 (AALSG) 作為工程材料之可行性。首先利用熱壓膨脹試驗判別還原碴之健性，並比較卜作嵐及鹼活化活性指數，評估其資源化之可行性，最後探討AALSG之工程與環境特性並以波特蘭I型水泥砂漿 (OPC) 為比較基準，評估其作為功能性材料之潛力及其環境相容性。
研究結果顯示，還原碴不適合作為卜作嵐摻料，由熱壓膨脹試驗前後之微觀分析，發現係因還原碴中之f-CaO及f-MgO轉化為Ca(OH)2及Mg(OH)2會造成體積之膨脹，長度變化量遠大於0.8 %，顯示還原碴具健性不穩定之問題。研究證實鹼活化還原碴，於反應初期便能將f-CaO及f-MgO轉化為Ca(OH)2、Mg(OH)2及鈣(鎂)矽水化物，經熱壓膨脹試驗，其長度變化量遠小於0.8 %，且活性指數及鹼活化指數皆超過75 %，顯示AALSG具作為工程材料之可行性。再者，AALSG具有較小之平均孔徑及孔隙體積，且水化產物皆以鈣矽水化物及矽鋁酸鹽水化物為主，使AALSG之抗壓強度及彈性模數皆優於OPC (皆約為1.1倍)，具較佳之力學特性，可作為替代OPC之工程材料。且環境特性上，AALSG具有較佳之耐久性，經105天硫酸鹽養治，長度變化量小於0.01 %，相對而言，OPC較易受硫酸鹽之侵蝕，而造成體積膨脹，長度變化量超過0.03 %；由長期溶出試驗得知，AALSG同樣有較少之溶出量，具良好之環境相容性；其中因矽鋁酸鹽水化物之生成，AALSG亦具有較佳之耐熱特性，相較OPC經550 °C熱處理後即開裂，AALSG還能有90 %以上之殘留強度，且經800 °C熱處理後亦能保有約14 % (4 MPa) 之殘留強度。綜合而言，鹼活化還原碴砂漿 (AALSG) 具健性穩定，且力學特性、耐熱特性、耐久性及環境相容性皆優於波特蘭I型水泥砂漿 (OPC)，係為具發展潛力之綠色工程材料。

This study investigated the engineering and environmental properties of alkali activated ladle slag mortar (AALSG). Ladle slag is unsuitable to be the pozzolanic material because the soundness of ladle slag can not meet the specification. However, alkali activated technology can transform f-Cao and f-MgO of ladle slag into the Ca(OH)2, Mg(OH)2 or calcium (magnesite) silicate hydrate in the beginning of hydration reaction cause the soundness of ladle slag meet the specification. Furthermore, both the activity index and alkali activated index of AALSG mortar are more than 75 % that means AALSG mortar is available to be the cementitious material. In the results of engineering and environmental properties, AALSG mortar with hydration products mainly composed with calcium silicate hydrate and calcium aluminum silicate hydrate that also displays smaller pore size and pore volume than OPC mortar. Therefore, both compressive strength and modulus elasticity of AALSG mortar are higher than OPC mortar, showing better mechanical properties. Besides, AALSG mortar shows better chemical durability and environmental compatibility than OPC mortar. Length variation of AALSG mortar is less than 0.01 % after curing 105 days in sulfate solution while OPC mortar easily eroded by sulfate, length variation is more than 0.03 %. From results of tank test, AALSG mortar shows lower Ca dissolution and the all regulated heavy metal leaching levels are not detected. Furthermore, better thermal resistance performance represent in AALSG mortar with calcium aluminum silicate hydrate. Through 550 °C heat treatment, OPC mortar cracked without residual strength, but AALSG mortar still keep more than 90 % residual strength. Even through 800 °C heat treatment, there is only 14 % residual strength (about 4 MPa) of AALSG mortar, but that is considerably high enough to prevent collapse of structure of specimen.

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