臺灣博碩士論文加值系統

摘要

本研究主要探討不同濕度試驗環境下鋼筋混凝土的碳化行為及其碳化後的力學行為與抗腐蝕能力。以固定水灰比（w/c = 0.6）製作混凝土試體，在飽和石灰水中養護28天後烘乾至恆重，再置於25℃、二氧化碳濃度50％的環境下，以不同的相對濕度（濕度循環70-90％、50-90％與定值濕度50％、70％和90％）加速混凝土碳化。

研究結果顯示：（1）在濕度循環的加速環境下碳化速率較定值濕度環境快。（2）經二氧化碳濃度修正後，濕度循環加速環境下所得之碳化係數與現地碳化係數較接近。（3）鋼筋混凝土在碳化後其力學性質包括抗壓強度、劈裂強度與握裹強度皆增加，與碳化深度成正比，但與加速環境的濕度無關。（4）鋼筋混凝土碳化使鋼筋越容易腐蝕，碳化深度越深則抗蝕能力衰減越明顯。

ABSTRACT
The purpose of this study is to explore the effects of humidity on the carbonation of the reinforced concrete and its associated mechanical properties and corrosion resistance. Concrete specimens with w/c of 0.6 were cured in saturated lime water for 28 days, oven-dried, and then put in accelerated environments with a constant temperature of 25 °C, CO2 concentration of 50% by volume, and various humidity environments, including constant humidities of 50%, 70%, and 90%, and cycling relative humidities ranging from 50% to 90%, or 70% to 90%. Results were summarized as follows. First, the cycling humidities induced higher carbonation coefficient than the constant humidity. Second, the converted carbonation coefficients determined by the cycling humidity environment were close to those determined from the onsite investigation. Third, the mechanical properties of the concrete were found increased by the carbonation. Fourth, the carbonation reduced the corrosion resistances of the reinforcements. Both the changes in the mechanical properties of the concrete and corrosion resistances of the reinforcements were associated with carbonation depth more than the relative humidities of the accelerated environment.

總目錄
中文摘要 I
英文摘要 II
致謝 III
總目錄 IV
表目錄 VII
圖目錄 X
第一章 緒論 1
1.1 研究動機 1
1.2 研究目的 2
1.3 研究方法與流程 2
第二章 文獻回顧 4
2.1 混凝土碳化機理探討 4
2.2 混凝土碳化速率及碳化深度 8
2.3 鋼筋腐蝕機理 12
2.3.1 腐蝕的基本條件 12
2.3.2 碳化對混凝土中鋼筋鏽蝕的影響 14
2.3.3 鋼筋混凝土腐蝕破壞過程 15
2.3.4 鋼筋混凝土鋼筋握裹強度發展與影響 16
2.3.5 鋼筋握裹力破壞模式 19
2.4 腐蝕量測方法 21
2.4.1 開路電位 22
2.4.2 直流極化法 23
2.4.3 交流阻抗 26
2.5 現地氣候模擬 30
2.5.1 加速溫濕循環模式的建立 30
2.5.2 現地碳化係數的調查 36
第三章 試驗計畫 37
3.1 試驗變數 37
3.1.1 定濕度環境 38
3.1.2 現地氣候模擬 39
3.1.3 試體編碼說明 43
3.2 試驗材料與配比 44
3.3 試體製作 52
3.3.1 碳化試體 52
3.3.2 拉拔試體 54
3.3.3 腐蝕試體 55
3.4 試驗原理及方法 61
3.4.1 先期試驗 61
3.4.2 碳化深度 63
3.4.3 力學性質 69
3.4.4 鋼筋腐蝕量測 74
3.5 試驗設備 78
3.5.1 加速碳化環境設備 78
3.5.2 力學試驗儀器 82
3.5.3 腐蝕量測儀器 88
3.5.4 其他試驗器材 94
第四章 試驗結果與分析 96
4.1 前言 96
4.2 碳化速率 96
4.3 現地與加速環境碳化係數比較 107
4.4 力學性質 111
4.4.1 抗壓強度 111
4.4.2 劈裂強度 118
4.4.3 拉拔強度 120
4.5 鋼筋腐蝕量測方法 125
4.5.1 不同電解液對腐蝕量測的影響 125
4.6 碳化鋼筋混凝土抗腐蝕能力 140
4.6.1 開路電位 140
4.6.2 直流極化法 143
4.6.3 交流阻抗法 144
第五章 結論與建議 147
5.1 結論 147
5.2 建議 148
參考文獻 149
附錄A 2000-2009年台北氣象站氣候資料 153
附錄B 現地碳化資料 164
附錄C 2002-2010年台北松山測站空氣品質監測資料 176
作者簡介 179

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