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研究生:陳君弢
研究生(外文):Chen Chun-Tao
論文名稱:混凝土中性化行為及其影響之研究
論文名稱(外文):Study of Carbonation and its Effect on Concrete Properties
指導教授:黃然黃然引用關係張建智
指導教授(外文):R. HuangJ.J. Chang
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:河海工程學系
學門:工程學門
學類:河海工程學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:中文
論文頁數:126
中文關鍵詞:中性化抗壓強度劈裂強度吸水率電阻硬度腐蝕預測模式
外文關鍵詞:carbonationcompressive strengthsplitting strengthabsorptionresistivityhardnesscorrosionprediction model
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本研究主要探討影響混凝土中性化速率的因素和中性化後各項性質的改變。研究中利用加速中性化法來瞭解環境濕度及水灰比對中性化速率影響,並以中性化後的混凝土試體進行各項力學性質、物理性質、化學性質、電化學性質與微觀分析試驗。同時評估加速試驗環境與自然環境的關聯性。
研究結果顯示,中性化後混凝土的抗壓強度、劈裂強度、鋼筋握裹強度皆提高。而混凝土中性化後其吸水率下降、電阻係數提高、表面硬度增加及電滲量減少。但當中性化深度到達鋼筋表面時,腐蝕電位明顯下降且腐蝕速率提高。微觀分析顯示中性化後混凝土孔隙結構較緻密且化學成份發生變化。利用X光繞射法分析可以獲取較精確的中性化的深度(酚僅能判別pH<9.2之混凝土)。
中性化試驗的結果顯示水灰比愈高,在相同的暴露時間下其中性化愈深。水灰比0.6的試體,在相對濕度50%的環境下,中性化速率最快。此外,以上下塗封所量得之中性化深度高於四周塗封之試體。最後,利用加速環境試驗的結果與現地調查的資料,建立加速環境中性化與自然環境中性化的關係式。
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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