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研究生(外文):Chen Chun-Tao
論文名稱(外文):Study of Carbonation and its Effect on Concrete Properties
指導教授(外文):R. HuangJ.J. Chang
外文關鍵詞:carbonationcompressive strengthsplitting strengthabsorptionresistivityhardnesscorrosionprediction model
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This study is to investigate the carbonation and its effect on concrete properties. Accelerated testing methods were applied to evaluate the carbonation factors such as environmental relative humidity and water/cement ratio and etc. Mechanical tests, physical tests, chemical tests, electrochemical tests, and SEM test were conducted.
Test results show that concrete carbonation may improve the compressive strength, splitting tensile strength, rebar bond strength and surface hardness. However, whenever the carbonation depth reaches the vicinity of rebar the half-cell potential significantly drops and the corrosion rate increases. A dense pore structure in the carbonated area was observed through SEM analysis and CaCO3 compound was detected to verify the carbonation depth using X-ray diffraction analysis.
It appears that the carbonation depth increases as the water/cement ratio increases and the specimens with a w/c ratio of 0.6 under 50% relative humidity have the fastest carbonation rate. In addition, the two-end coated specimens had larger carbonation depth than the side-surface coated specimens.
中文摘要 i
英文摘要 ii
目錄 iii
圖目錄 v
表目錄 viii
第一章 緒論
1.1 研究動機 1
1.2 研究目的與範圍 2
1.3 研究方法與流程 3
第二章 文獻回顧
2.1 前言 6
2.2 混凝土之耐久性 6
2.3 混凝土中性化之機理 10
2.4 混凝土中性化之性質改變 12
2.5 混凝土中性化之量測方法 14
2.6 混凝土中性化之影響因子 15
2.7 混凝土中性化之評估模式 17
第三章 實驗計劃
3.1 試驗變數 22
3.2 試驗材料與配比 26
3.3 試驗設備 29
3.4 試驗方法 41
3.4.1 先期試驗 41
3.4.2 混凝土實驗 42
第四章 結果與分析
4.1 前言 52
4.2 力學性質 52
4.2.1 抗壓強度 52
4.2.2 劈裂強度 57
4.2.3 彈性模數 60
4.2.4 鋼筋握裹強度 63
4.3 物理性質 64
4.3.1 吸水率 64
4.3.2 硬度 69
4.3.3 電阻係數 71
4.4 微觀分析 75
4.4.1 電子顯微鏡晶相觀察 75
4.4.2 X光繞射法化合物分析 79
4.5 電化學性質 83
4.5.1 電滲 83
4.5.2 鋼筋腐蝕速率 88
4.6 中性化深度與加速時間之關係 96
第五章 結論與建議
5.1 結論 119
5.2 建議 121
參考文獻 123
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