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研究生:莊宜倢
研究生(外文):Yi-chieh Chuang
論文名稱:砂漿中鋼筋腐蝕與氯離子擴散行為相關性研究
論文名稱(外文):Relationships Between Reinforcement Corrosion and Chloride Ion Diffusion in Mortar
指導教授:陳君弢陳君弢引用關係
指導教授(外文):Chun-tao Chen
口試委員:陳君弢
口試委員(外文):Chun-tao Chen
口試日期:2014-01-15
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:營建工程系
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:167
中文關鍵詞:鋼筋腐蝕氯離子碳化養護拌合
外文關鍵詞:reinforcement corrosionchloride ioncarbonationcuringmixing
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過去的研究中多著重於探討氯離子於混凝土中的擴散行為,卻未深入探討氯離子擴散與鋼筋腐蝕間的交互關係,氯離子擴散公式中亦未考慮鋼筋腐蝕因子,因此本研究探討砂漿試體中氯離子擴散行為與鋼筋腐蝕程度之相關性。研究中透過通電方式製作腐蝕程度不同的鋼筋後,再以淡水或鹽水作為拌合水製作水灰比0.6之內埋鋼筋砂漿試體,再置於不同養護環境中,以觀察氯離子濃度分布與鋼筋腐蝕之相對關係。試驗結果顯示,氯離子的分佈可能受鋼筋腐蝕影響。水化早期(7天)時,於淡水拌合、鹽水養護之環境下,氯離子受鋼筋腐蝕吸引,氯離子濃度隨鋼筋初始通電時間增加,上升幅度約有3倍之多,而無論鹽水拌合、不拆模靜置於大氣中或於飽和石灰水養護之環境,鋼筋腐蝕的過程中卻排斥氯離子,濃度下降幅度約為17%~43%。然而,就長期水化(28天)而言,該影響較不顯著,很可能緣於水化漿體限制氯離子的移動。另外,本研究中亦透過碳化後之試體觀察氯離子與鋼筋腐蝕相互影響關係。當碳化深度不足以影響鋼筋時,隨著碳化深度增加,因氯離子不易進入試體內部,鋼筋腐蝕速率亦趨緩。
This study explored the relationship between the diffusion of the chloride ions and the reinforcement corrosion in mortar. Such relationship was not studied in literature although the diffusion of chloride ions in concrete was well discussed. In this study, the corroded reinforcements were prepared in advance by applied currents. Mortar specimens with w/c of 0.6 were prepared and cured using either salt or fresh water. Results showed that the chloride ion distribution was associated with the reinforcement corrosion. During the early hydration, the chloride ions were attracted by the reinfoecement corrosion in the specimens prepared with salt water and cured in fresh water. On the contrary, the chloride ions were repulsed in those prepared with salt water and cured either in air or by self-curing. However, in the long-term hydration, such influencing effects were not clear, possibly due to the hydration. In addition, this study explores the above relationship in carbonated mortar. As the carbonation proceeded, the chloride ion migration slowed down and the reinforcement corrosion was reduced.
摘要
Abstract
誌謝
總目錄
表目錄
圖目錄
第一章 緒論
1.1 研究動機
1.2 研究目的
1.3 研究方法及流程
第二章 文獻回顧
2.1 鋼筋腐蝕
2.1.1 腐蝕的定義
2.1.2 腐蝕的形態
2.1.3 電化學腐蝕
2.1.4 混凝土中鋼筋腐蝕的原因
2.1.5 鋼筋腐蝕量測法
2.2 氯離子基本性質
2.2.1 混凝土中氯離子來源
2.2.2 混凝土中氯離子存在型態
2.2.3 混凝土孔隙結構與氯離子傳輸
2.2.4 氯離子對鋼筋腐蝕的影響
2.2.5 氯離子量測法
2.3 混凝土碳化機理
2.3.1 碳化的定義
2.3.2 混凝土碳化的原因
2.3.3 混凝土碳化對氯離子及鋼筋腐蝕的影響
2.3.4 混凝土碳化判定方法
第三章 試驗規劃
3.1 試驗變數
3.2 試驗配比與材料
3.3 試體製作
3.4 試驗方法與設備
3.4.1 鋼筋加速腐蝕
3.4.2 鋼筋腐蝕量測試驗
3.4.3 氯離子濃度量測試驗
3.4.4 溶液酸鹼值量測試驗
3.4.5 碳化試驗
3.4.6 微觀結構分析試驗
第四章 試驗結果與分析
4.1 前言
4.2 先期試驗
4.2.1 鋼筋加速腐蝕試驗
4.2.2 不同金屬鏽蝕對於氯離子擴散之影響評估
4.3 氯離子濃度量測
4.3.1 淡水拌合、鹽水養護之環境
4.3.2 淡水拌合、不拆模且靜置於大氣之環境(控制組)
4.3.3 鹽水拌合、不拆模且靜置於大氣之環境
4.3.4 鹽水拌合、飽和石灰水養護之環境
4.4 鋼筋腐蝕量測
4.4.1 開路電位量測腐蝕趨勢
4.4.2 直流極化法量測腐蝕速率
4.5 氯離子濃度與鋼筋腐蝕之相關性
4.5.1 淡水拌合、鹽水養護之環境
4.5.2 淡水拌合、不拆模且靜置於大氣之環境
4.5.3 鹽水拌合、不拆模且靜置於大氣之環境
4.5.4 鹽水拌合、飽和石灰水養護之環境
4.6 溶液酸鹼值量測試驗
4.6.1 鹽水中置入鋼筋時溶液酸鹼值之變化
4.6.2 pH值與鋼筋腐蝕之相關性
4.7 碳化後浸泡於鹽水之複合劣化環境
4.7.1 碳化深度量測試驗
4.7.2 氯離子濃度量測
4.7.3 鋼筋腐蝕量測
4.7.4 碳化深度、氯離子濃度及鋼筋腐蝕之相關性
4.8 微觀結構分析
4.8.1 掃描式電子顯微鏡(SEM)分析
4.8.2 X光繞射儀(XRD)分析
第五章 結論與建議
5.1 結論
5.2 建議
參考文獻
附錄A SEM分析圖
附錄B XRD圖譜
附錄C 試體吸水率
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