臺灣博碩士論文加值系統

陰極防蝕外加電流應用在鋼筋混凝土上，雖為一有效之防蝕法，然而應用時對材料之握裹力折減之影響，實有必要研究出有效改善負面影響的對策。本研究之範圍係以改善陰極防蝕外加電流對添加波索蘭材料混凝土握裹力之影響為主。實驗中係以混凝土中添加波索蘭材料取代水泥的方式，並以電流密度及通電時間為試驗變數，利用單筋拉拔試驗法得到握裹力與位移兩者關係，藉此探討添加波索蘭材料後，陰極防蝕對握裹強度的影響，是否達到改善握裹力降低的效果。此外，輔以鈉、鉀離子在混凝土中之濃度量測與界面處微硬度實驗分析，並利用SEM微觀結構觀察來佐證實驗結果。
研究結果顯示以波索蘭材料取代水泥之混凝土，確實對握裹強度折減的情況有抑制的效果，且隨著通電時間及電流密度的增加，其握裹力的折減效應更為明顯。除此之外，從鈉、鉀離子累積含量與硬度值試驗中，可瞭解混凝土在通電後與鋼筋界面軟化的情況，會隨著鈉、鉀離子累積含量增加而有愈嚴重的趨勢。最後利用單筋拉拔試驗所得到握裹力與位移之關係圖，求出材料參數K值與qy值及影響參數ψ值，並建立其與握裹強度之關係。本研究成果，將可提供工程界未來在陰極防蝕設計上之參考數據。

In this study, a strategy to improve the bond degradation due to a cathodically protected reinforced structure is studied. The main idea is to add pozzolans in concrete such that the bond strength degradation due to the cathodic current could be retarded. Pozzolans were added in concrete as the replacement of cement. Under various cathodic current densities and polarization periods, the bond performances of various concrete mixes were evaluated using the single rebar pullout test. Analyzing these data, the improvement of bond degradation by adding the pozzolans was investigated. In addition to the pullout test, three indirect experiments were conducted to understand the interface behaviors: (1) the chemical titration determines the accumulated potassium and sodium ions nearby the rebar-concrete interface; (2) the micro-hardness test is performed to examine the softening effect; (3) microstructure changes were examined using the back-scattering scanning electronic micrscope (SEM).
The results showed that adding pozzolans in concrete could effectively reduce the bond degradation due to the cathodic current. As increasing the polarization time and/or current density, the bond degradation became more apparent. Chemical titration test and microhardness test revealed that interface softening became more apparent as the concentration of the accumulated potassium and sodium ions became higher, which indicated the bond strength became worse. A unified parameter (ψ), that combines the effect of polarization time and current density, was used to study the effects of cathodic current on the three interface bond parameters. The results of this study and previous efforts fulfilled in this research group can cast a guideline for cathodic protection design.

中文摘要 i
英文摘要 ii
目錄 iii
圖目錄 v
表目錄 ix
第一章 緒論
1-1 前言 1
1-2 研究動機與目的 2
1-3 研究方法與流程 3
第二章 文獻回顧
2-1 鋼筋腐蝕機理 6
2-2 陰極防蝕法 9
2-2-1 陰極防蝕法的起源與發展 9
2-2-2 陰極防蝕法之應用 9
2-3 握裹應力 11
2-3-1 前言 11
2-3-2 握裹之抗力機構 13
2-3-3 握裹力之破壞模式 13
2-4 添加波索蘭材料對混凝土之影響 14
2-4-1 常用波索蘭材料之種類 15
2-4-2 波索蘭材料之作用機理 17
2-4-3 波索蘭材料對混凝土之影響 18
2-5 硬度試驗 19
2-6 水泥複合材料界面區的微觀結構 20
第三章 實驗計劃
3-1 試驗材料 21
3-2 試驗設備 24
3-3 試體製作與實驗裝置 29
3-3-1 試體製作 30
3-3-2 陰極電流裝置 30
3-4 試驗方法 31
第四章 結果與分析
4-1 抗壓強度 39
4-2 飛灰爐石對拉拔強度之影響 41
4-3 通電時間對拉拔強度之影響 43
4-4 電流密度對握裹強度之影響 50
4-5 其它界面材料參數折減 57
4-6 影響參數對握裹強度之影響 62
4-7 通電時間與硬度的關係 63
4-8 鈉、鉀離子累積含量與握裹強度之關係 67
4-9 SEM觀測 78
第五章 結論與建議
5-1 結論 85
5-2 建議 86
參考文獻 87
謝誌
作者簡歷

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