| 摘要: | 鋼筋混凝土結構物中所使用之水泥屬高耗能產物，在能源及資源日益貧乏的今天，尋求具有良好性質之替代性材料將是未來工程界不可避免的發展趨勢，本文就電弧爐煉鋼所產生之爐石-還原碴，運用添加鹼活化劑之方法提昇其性質做一探討。矽酸鈉、碳酸鈉、氫氧化鈉及磷酸鈉等為一般常用於提昇灰碴性質之活化劑，因其具有高pH值的特性而被稱為鹼活化劑；根據以往研究指出經鹼活化劑激發其活性之灰碴具有較佳抗壓強度、耐久性及抗化學侵蝕之能力，但因鹼活化劑快速的激發效果常有其負面之影響，如速凝、乾縮量大的缺點。 本文除對碳酸鈉、氫氧化鈉及磷酸鈉進行試驗外，特別針對矽酸鈉添加於還原碴之提昇效果進行探討；試驗結果顯示，在水膠比為0.5之純還原碴漿體，其抗壓強度有隨矽酸鈉添加濃度增加而增加的趨勢；而在收縮量與速凝行為之表現上亦隨濃度增加而有愈形明顯之趨勢。另外，在抑制收縮的試驗中，以添加石膏與提昇養治溫度兩種方式所得之抑制效果最好；而在以添加輸氣劑作為抑制收縮之方法中，其效果雖不及前兩者，但在抑制收縮之成效上卻有隨劑量增加而持續提昇之穩定特性。無論何種抑制收縮之方法，對抗壓強度均有其負面之影響，而對凝結時間而言皆具緩凝之效果。 The cement used in the construction of reinforced concrete is the highly consumable production. It is impossible in future to avoid the trend that in engineering. People look for the good qualitative aggregate, which can replace the first one. This paper is discussing about the usage of refining slag of steel-making of arc furnace, and of alkali activator. As usual, the sodium silicate, sodium carbonate, sodium phosphate and sodium hydroxide are named both “Activator” and “Alkali-Activator” after its pH. The long-chapter researches report that the slag, which is aroused by alkali activator, is capable of compressive strength, durability and resistance to chemical attack; however, the influence aroused by alkali activator is also prone to the defect of rapid setting, a plenty of drying shrinkage. Except the experiment with sodium silicates, sodium hydroxides and sodium phosphates, this paper especially researches the influence of refining slag, whereby the sodium silicates put. After the experiment, we found that the pure refining slag with o.5 w/b, whose compressive strength must be added, is following the dosage of the sodium silicate; the behavior of drying shrinkage and rapid setting must be evident, are also following the dosage of the sodium silicate. In addition, the most effective method were adding gypsum and raising temperature in the experiment of the restraining shrinkage; the effect which adding air-entraining isn’t as well as the methods of adding gypsum and raising temperature, but it possesses better stability and the property which shrinkage must be reduced, is following the dosage of medicament. All of methods about restraining shrinkage in this paper are not beneficial to the compressive strength and the effect of the rapid setting is light. |
