臺灣博碩士論文加值系統

中文摘要
鋼筋的腐蝕是鋼筋混凝土結構物破壞的主因，為瞭解鋼筋混凝土在添加鋼纖維後，鋼筋受鹽害作用或碳化作用的腐蝕情形。本研究旨在探討鋼筋與鋼纖維兩種鋼材在不同氯離子濃度(0%，1%，2%，3%)的模擬孔隙水溶液中之腐蝕行為，以及不同添加量的鋼纖維(0%，0.25%，0.5%)對於鋼筋腐蝕訊號之影響，最後再以水泥砂漿作為保護層去作對照，並對鋼纖維水泥砂漿進行力學、物理性質之探討。量測指標主要包括抗壓強度、劈裂強度、吸水率、四極式電阻、開路電位及腐蝕速率。研究結果顯示，鋼纖維較鋼筋來的耐腐蝕，且鋼纖維對氯離子的侵蝕有較好的抵抗。在無任何氯離子進入下，鋼纖維的開路電位較鋼筋來的小。鋼纖維的添加確實會干擾鋼筋腐蝕訊號的量測值。鋼纖維在未腐蝕情況下其腐蝕速率卻落在中高度腐蝕範圍，此試驗結果並不適合作為評估鋼纖維腐蝕速率之可靠指標。低濃度的氯離子侵蝕下，鋼纖維的添加並沒有延緩腐蝕的效果。在氯離子濃度侵蝕到某個時間點其鋼筋的腐蝕機率及腐蝕速率隨著鋼纖維添加量的增加而越低，鋼纖維的添加確實有延緩鋼筋腐蝕的效果。就長期趨勢來看，氯化鈉隨材料事先的?入很可能會使的添加鋼纖維沒有延緩腐蝕的功效，反而會在最後加速鋼筋的腐蝕。
關鍵字:鋼筋腐蝕、鋼纖維腐蝕、氯離子、腐蝕行為

Abstract

Rebar corrosion is a key issue for concrete durability. In this study, what is the effect of adding steel fibers in concrete on the electrochemical measurements is studied. First, the electrochemical measurements were taken for steel fiber and steel rebar in the simulated pore solution environment with chloride concentrations of 0, 1, 2 and 3 %. Then, the electrochemical measurements were taken for steel rebar in the simulated pore solution environment with various chloride concentrations with adding different amount of fibers (0, 0.25 and 0.5%) to see whether the fibers will affect the electrochemical measurements. Final, the mortar specimens were made and electrochemical measurements as well as the mechanical and physical properties, including the open circuit potential, corrosion rate, compressive strength, splitting tensile strength, four-probe electrical resistivity and water absorption test, were evaluated to see the effects of fibers. Results showed that steel fibers had better corrosion prevention capability than rebars, and fibers had better resistance to chloride ions. When no chloride ions existed, the steel fiber had a nobler potential. Adding steel fibers indeed disturb the electrochemical measurements of steel rebar. When steel fibers have no apparent corrosion, the corrosion rate showed a medium-to-high corrosion risk. It means the corrosion rate measurement for steel fibers cannot be taken as the corrosion index. For low chloride ion concentration environment, adding steel fibers did not retard the corrosion of steel rebar. For environments with chloride ions, adding steel fibers can retard the corrosion and this effect becomes more apparent as the volume ratio of steel fibers is higher. For long term trend, if the chloride ion existed in concrete the retarding effect of adding steel fibers is not apparent but more violent corrosion of rebar may occur due to the galvanic cell effect between corroded steel fibers and rebar.
Keywords: rebar corrosion, steel fiber corrosion, chloride ions, corrosion behaviours

目錄
中文摘要 i
英文摘要 ii
目錄 iv
圖目錄 viii
表目錄 xii
第一章 緒論 1
1-1前言 1
1-2研究動機與目的 2
1-3研究範圍 4
1-4研究方法和流程 5
第二章 文獻回顧 8
2-1腐蝕機理 8
2-2鋼纖維 11
2-2-1鋼纖維混凝土特性 11
2-2-2鋼纖維混凝土的耐腐蝕特性 12
2-2-3鋼纖維砂漿的電化學振蕩現象 13
2-2-4微鋼纖維對混凝土鹼骨材反應以及鋼筋腐蝕之影響 14
2-3模擬混凝土孔隙水溶液 15
2-4混凝土中性化機理 16
2-4-1中性化原理 16
2-4-2中性化對鋼筋混凝土的影響 18
2-5氯離子對鋼筋混凝土的影響 20
2-5-1混凝土中氯離子的來源及存在型態 20
2-5-2氯離子對鋼筋的影響 24
2-6直流極化法 26
第三章 實驗計畫 29
3-1實驗變數 29
3-2實驗材料 30
3-3試驗設備 37
3-4試體製作與試驗方法 43
3-4-1試體製作 43
3-4-2試驗方法 49
第四章 結果與分析 58
4-1鋼筋及鋼纖維在模擬孔隙水溶液中的腐蝕行為 58
4-1-1前言 58
4-1-2鋼纖維在0%到3%氯離子濃度的腐蝕行為 67
4-1-2-1開路電位法 67
4-1-2-2直流極化法 70
4-1-3添加鋼纖維對鋼筋在0%氯離子濃度的腐蝕行為 74
4-1-3-1開路電位法 74
4-1-3-2直流極化法 75
4-1-4添加鋼纖維對鋼筋在1%氯離子濃度的腐蝕行為 78
4-1-4-1開路電位法 78
4-1-4-2直流極化法 79
4-1-5添加鋼纖維對鋼筋在2%氯離子濃度的腐蝕行為 83
4-1-5-1開路電位法 83
4-1-5-2直流極化法 85
4-1-6添加鋼纖維對鋼筋在3%氯離子濃度的腐蝕行為 89
4-1-6-1開路電位法 89
4-1-6-2直流極化法 91
4-1-7添加鋼纖維對鋼筋在氯離子濃度變化的腐蝕行為 95
4-1-7-1開路電位法 95
4-1-7-2直流極化法 95
4-1-8不同氯離子濃度變化下鋼筋及鋼纖維之腐蝕行為 98
4-1-8-1開路電位法 98
4-1-8-2直流極化法 99
4-1-9不同氯離子濃度變化下鋼筋及鋼纖維之腐蝕行為 104
4-1-9-1開路電位法 104
4-1-9-2直流極化法 104
4-2鋼筋及鋼纖維在水泥砂漿中的腐蝕行為 109
4-2-1前言 109
4-2-2添加鋼纖對鋼筋水泥砂漿在海水中的腐蝕行為 118
4-2-2-1開路電位法 118
4-2-2-2直流極化法 119
4-2-3添加鋼纖對鋼筋水泥含鹽砂漿在海水中的腐蝕行為 121
4-2-3-1開路電位法 121
4-2-3-2直流極化法 122
4-2-4鋼纖維純砂漿及含鹽砂漿在海水中的腐蝕行為 126
4-2-4-1開路電位法 126
4-2-4-2直流極化法 126
4-2-5鋼纖維在不同位置上之腐蝕電位與速率 130
4-2-6鋼纖維水泥砂漿的力學性質 138
4-2-6-1抗壓強度試驗 138
4-2-6-2劈裂強度試驗 138
4-2-7鋼纖維水泥砂漿的物理性質 141
4-2-7-1吸水率試驗 141
4-2-7-2四極式電阻試驗 141
第五章 結論與建議 144
5-1結論 144
5-2建議 147
參考文獻 148
附錄A
附錄B
謝誌
個人簡歷

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