臺灣博碩士論文加值系統

由於台灣四面環海，且處於亞熱帶與熱帶地區，所以對鋼筋混凝土結構物而言，屬於腐蝕性侵蝕的環境。而當氯離子侵入混凝土中，達到一定的含量時，鋼筋表面的鈍化層(passive layer)會被破壞，進而使鋼筋腐蝕，降低結構物的強度與勁度，對結構物造成極大威脅。因此，鋼筋腐蝕已成為影響結構物使用壽命和安全性的主要因素之一。
本研究藉由在混凝土拌合時，添加不同濃度的氯鹽，來模擬鋼筋在不同氯鹽濃度下的腐蝕情況，希望能藉此找出誘發鋼筋腐蝕之臨界氯離子濃度。另外使用非破壞檢測的方式來判斷鋼筋腐蝕的情況。而非破壞檢測是使用美國James儀器公司製作的Gecor 8腐蝕電流儀進行試驗，最後再將試體破壞取出鋼筋觀察鋼筋表面實際的腐蝕情況。另外再做初始酸鹼值試驗和酸中和試驗來縮小臨界氯離子濃度的範圍。
臨界氯離子濃度以[Cl-]/[OH-]表示時，0.45、0.55、0.65的OPC以及水膠比0.55使用50%的爐石取代量的臨界值分別1.095、0.99、1.018和5.185。以[Cl-]/[H+]表示時，0.45、0.55、0.65的OPC以及水膠比0.55使用50%的爐石取代量的臨界值分別0.0057、0.0057、0.0063和0.014。使用爐石取代部分水泥可以使鋼筋開始腐蝕的臨界氯離子濃度提高，增加對鋼筋的保護能力，提高耐久性。

Taiwan is surrounded by sea, so the reinforced concrete structures are exposed to corrosive environments. When chloride ions penetrated into the concrete, to reach a certain concentration, the reinforcing steel surface passive layer be destroyed and cause the steel corrosion, it will reduce structure strength and stiffness. Therefore, the reinforcing steel corrosion is the main factors to structures life and security.
This study add different concentrations of chloride salts when the concrete mixing, to simulate the reinforcing steel corrosion situation at different chloride concentrations, to identify the critical chloride ion concentration. Use non-destructive testing to determine the corrosion situation of reinforcing steel. Final destruct the specimen and remove the reinforcing steel to observe actual corrosion. Do other tests like initial pH value and acid neutralization tests to narrow the critical range of chloride ion concentration.
Critical chloride ion concentration thresholds [Cl-] / [OH-] for OPC 0.45, 0.55, 0.65 and 0.55-50% GGBS are 1.095, 0.99, 1.018 and 5.185, respectively. [Cl-] / [H+] for OPC 0.45, 0.55, 0.65 and 0.55-50% GGBS are 0.0057, 0.0057, 0.0063 and 0.014, respectively. Using slag replace part of cement will increased the critical chloride ion concentration, increasing the protection of steel capacity, improve durability.

目錄

口試委員會審定書 #
誌謝 II
中文摘要 III
ABSTRACT IV
目錄 V
表目錄 X
照片目錄 XVI
Chapter 1 第一章 緒論 1
1.1 研究動機……………………….. 1
1.2 研究目的 1
1.3 研究流程 2
Chapter 2 第二章 文獻回顧 4
2.1 鋼筋腐蝕的機制 4
2.1.1 鋼筋腐蝕的原理 4
2.1.2 影響鋼筋腐蝕的因素 4
2.2 混凝土內含氯離子 6
2.2.1 氯離子的來源 6
2.2.2 混凝土內氯鹽含量之相關規範 7
2.3 添加卜作嵐材料 7
2.3.1 矽灰 8
2.3.2 飛灰 8
2.3.3 爐石 9
2.4 混凝土內鋼筋腐蝕的檢測方法和依據 12
2.4.1 腐蝕電位(Corrosion Potential) 12
2.4.2 鋼筋腐蝕速率(Corrosion Rate) 13
2.4.3 混凝土電阻係數(Electrical Resistance) 15
2.4.4 失重法 17
2.4.5 綜合比較 17
2.5 硬固混凝土的化學性質 17
2.5.1 硬固混凝土的酸鹼值(pH值)量測 17
2.5.2 硬固混凝土的酸中和能力(ANC) 18
2.6 氯離子鍵結能力 19
2.6.1 水泥中C3A對氯離子鍵結能力的影響 19
2.6.2 爐石對氯離子鍵結能力的影響 19
2.7 臨界氯離子濃度 19
2.7.1 臨界氯離子濃度的定義 20
2.7.2 臨界氯離子濃度的表達方式 20
Chapter 3 第三章 實驗計畫與試驗設備 36
3.1 實驗內容……………………………. 36
3.2 試驗材料 36
3.3 試驗儀器 37
3.4 水泥砂漿拌合流程 38
3.5 水泥砂漿抗壓強度試驗 38
3.5.1 試驗材料與設備 38
3.5.2 試驗方法 38
3.6 氯離子含量滴定試驗 39
3.6.1 試驗材料與設備 39
3.6.2 水溶性氯離子含量試驗 39
3.6.3 酸溶性氯離子含量試驗 39
3.7 水泥砂漿PH值試驗 40
3.7.1 試驗材料與設備 40
3.7.2 試驗方法 40
3.8 水泥砂漿酸中和能力試驗 40
3.8.1 試驗材料與設備 41
3.8.2 試驗方法 41
3.9 鋼筋腐蝕電流量測試驗 41
3.9.1 試驗材料與設備 41
3.9.2 試驗方法 41
3.10 鋼筋表面實際腐蝕情況 42
3.10.1 試驗材料與設備 42
3.10.2 試驗方法 42
Chapter 4 第四章 試驗結果與討論 55
4.1 水泥砂漿抗壓強度試驗結果與分析 55
4.1.1 氯離子含量對抗壓強度之影響 55
4.1.2 水膠比對抗壓強度之影響 55
4.1.3 爐石取代對抗壓強度之影響 56
4.2 水泥砂漿的PH值試驗和酸中和能力試驗結果與分析 56
4.2.1 氯鹽添加量對PH值和酸中和能力的影響 56
4.2.2 水膠比對PH值的影響 57
4.2.3 爐石取代對PH值的影響 57
4.2.4 水膠比對酸中和能力的影響 58
4.2.5 爐石取代對酸中和能力的影響 58
4.3 氯離子滴定試驗結果與分析 58
4.3.1 酒精燈直接加熱法和隔水加熱法比較 59
4.3.2 水溶法結果與討論 59
4.3.3 酸溶法結果與討論 59
4.3.4 酸溶法和水溶法綜合比較與討論 60
4.4 鋼筋腐蝕電流密度試驗結果與討論 60
4.4.1 水膠比對腐蝕電流密度的影響 60
4.4.2 爐石取代對腐蝕電流密度的影響 61
4.4.3 90天腐蝕電流密度和180天腐蝕電流密度的比較和討論 61
4.5 鋼筋表面實際腐蝕情形結果與分析 61
4.5.1 氯離子添加量對鋼筋表面實際腐蝕情況的影響 61
4.5.2 腐蝕電流密度和鋼筋表面實際腐蝕情況的關係與討論 62
4.6 臨界氯離子濃度 62
4.6.1 以總氯離子表示 62
4.6.2 以自由氯離子表示 63
4.6.3 以[Cl-]/[OH-]表示 63
4.6.4 以[Cl-]/[H+]表示 64
4.6.5 綜合比較 64
Chapter 5 第五章 結論與建議 92
5.1 結論 92
5.1.1 水泥砂漿性質之結論 92
5.1.2 鋼筋腐蝕趨勢之結論 92
5.1.3 臨界氯離子濃度之結論 93
5.2 建議 93
參考文獻 95

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