臺灣博碩士論文加值系統

本研究主要探討防蝕塗層特性，其中包括防蝕效能及塗層鋼筋與混凝土的結合強度。塗層材料利用SEM觀測來評估其成分及組織，並進行鍍鋅材料腐蝕試驗來評估其在不同環境下的腐蝕速率。鋼筋混凝土試體則利用加速腐蝕法進行鋼筋腐蝕試驗及直接拉拔試驗。
試驗結果顯示鍍鋅材料在pH=12水溶液中，腐蝕速率高於碳鋼，在3.5%NaCl水溶液中，腐蝕速率略低於碳鋼；鋼筋混凝土直接拉力試驗顯示，鋼筋未腐蝕前，鍍鋅鋼筋握裹強度約較普通鋼筋大5~10%。以熱浸鍍鋅時間2分鐘之鍍鋅鋼筋試體有最高的握裹強度。然環氧樹脂鋼筋握裹強度較普通鋼筋少20%。
鋼筋腐蝕後握裹強度隨著腐蝕速率增加有明顯遞減的現象，相同加速腐蝕條件下(通電14天)，普通鋼筋握裹強度約折減25%，鍍鋅鋼筋握裹強度約折減12~54%，以熱浸鍍鋅時間3分鐘者折減54%比例最高，熱浸鍍鋅時間1分鐘之試體，腐蝕後握裹強度折減比例最少。環氧樹脂鋼筋在通電5天後握裹強度並無明顯變化，顯示鋼筋在環氧樹脂包覆情況下，具良好之防蝕效能。

The objective of this study is to assess the corrosion resistance of zinc-coated and epoxy-coated rebars and coating effect on the bond strength between concrete and steel. Testing variables include type of coating and coating thickness.
Potentiodynamic polarization method and weight-loss method were utilized to determine the corrosion rate of steel and zinc in both pH=12 solution and 3.5% NaCl solution. In addition, open circuit potentials, DC polarization resistance were measured to evaluate the rebar corrosion. Cylindrical specimens were exposed to 3.5% NaCl solution and a DC current (0.5mA/cm2) was applied to accelerate the corrosion process.
Test results from Potentiodynamic polarization curves and weight-loss testing show that zinc has higher corrosion rate than carbon steel in pH=12 solution but lower in 3.5% NaCl solution. The bond strength of untreated rebar is about 5~10% weaker than zinc-coated rebar and about 20% stronger than epoxy-coated rebar. The bond strength decreases with an increase in corrosion rate. After 14-day accelerating corrosion process, the bond strength for 1-minute hot-dip zinc-coated rebar decreased by 12% and 3-minute hot-dip zinc-coated rebar decreased by 54%. Besides, the bond strength of epoxy-coated rebar was not affected by the corrosion process in this study.

目錄
中文摘要 I
目錄 II
表目錄 IV
圖目錄 V
第一章 緒論1
1-1前言1
1-2研究動機1
1-3研究流程1
第二章 文獻回顧3
2-1鋼筋腐蝕機理3
2-2熱浸鍍鋅鋼筋之特性與製程5
2-3氧樹脂鋼筋之特性與製程9
2-4鋼筋混凝土握裹行為10
2-5鋼筋腐蝕速率量測13
第三章 試驗計畫17
3-1試驗變數17
3-2試驗材料與配比18
3-3試驗設備21
3-4試驗方法26
第四章 結果與分析35
4-1混凝土力學性質35
4-2防蝕塗層材料特性36
4-2-1鍍鋅鋼筋微觀分析36
4-2-2碳鋼及鍍鋅材料腐蝕速率41
4-2-3防蝕塗層材料附著厚度44
4-3鋼筋混凝土腐蝕試驗45
4-4防蝕鋼筋握裹強度影響之探討56
4-5腐蝕對鋼筋握裹強度影響之探討58
4-6鋼筋混凝土界面性質61
4-6-1氯離子濃度61
4-6-2 X光繞射法化合物分析63
第五章 結論與建議67
5-1 結論67
5-2 建議68
參考文獻69

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