臺灣博碩士論文加值系統

由於粗骨材滲透性遠小於水泥漿體，因此混凝土之滲透性受粗骨材用量多寡所影響。本研究利用加速氯離子穿透試驗並配合粗骨材在混凝土中影響離子傳輸的四種效應，包括(1)稀釋效應(dilution)；(2)彎曲效應(tortuousity)；(3)材料界面過渡區(interfacial transition zone, ITZ )；(4)連通效應(percolation)，探討不同粗骨材用量對混凝土氯離子傳輸行為之影響。
研究成果顯示，水灰比0.35，粗骨材用量超過40%以上及水灰比0.45，粗骨材用量在20%以上時，粗骨材可能會對氯離子在混凝土中傳輸行為產生界面過渡區及連通效應，對混凝土抵抗氯離子穿透行為產生負面影響；而在水灰比0.35，粗骨材用量低於40%以下及水灰比0.45，粗骨材用量在20%以下時，氯離子在混凝土中的傳輸行為主要受到漿體品質及粗骨材稀釋及彎曲效應所影響。

The permeability of cement paste is influenced primarily by pore structure (porosity, size, and connectivity), which is a function of the water-to-cement ratio (w/c) and the degree of hydration. The aggregates which are commonly used in concrete typically have a much lower permeability than the composite concrete in four ways: dilution, tortuosity, interfacial transition zone (ITZ), and percolation. A description of each effect is provided in the following section.
The results show that when water ratios are 0.35 and 0.45, volume fractions of coarse aggregate are above 40% and 20%, the influence of aggregates on interfacial transition zone and percolation effects can be detected. The water ratios are 0.35 and 0.45, volume fractions of coarse aggregate are under 40% and 20%, the behavior of chloride ions transportation was influences by dilution and tortuosity effect.

摘要 Ⅰ
目錄 Ⅱ
圖目錄 Ⅴ
表目錄 Ⅶ
第一章 緒論
1-1研究動機 1
1-2研究目的 1
1-3研究流程 2
第二章 文獻回顧
2-1氯離子對混凝土性質之影響 3
2-1-1氯離子去鈍化機理 3
2-2 粗骨材在混凝土中之影響 5
2-2-1粗骨材之滲透性 5
2-2-2粗骨材孔隙 6
2-2-3有害物質 6
2-2-4骨材形狀與紋理 6
2-3骨材與混凝土界面 7
2-3-1骨材界面之影響 7
2-3-2界面破壞之原因 8
2-4混凝土孔隙結構探討 9
2-5影響離子入滲機理之效應 10
2-6評估混凝土抵抗氯離子能力之試驗方法 13
2-6-1快速氯離子滲透試驗 13
2-6-2加速氯離子穿透試驗 17
2-7氯離子擴散係數之推算 18
第三章 試驗計畫
3-1試驗目的 21
3-2試驗變數 21
3-3試驗材料 21
3-4試驗配比 23
3-5試驗儀器設備 25
3-6試驗方法 27
3-6-1加速氯離子穿透試驗 27
3-6-2氯離子電位自動滴定 29
第四章 結果與討論
4-1粗骨材用量與氯離子傳輸累積濃度之關係 32
4-2不同水灰比與氯離子傳輸累積濃度之關係 38
4-3粗骨材用量對氯離子傳輸之影響 42
4-3-1 粗骨材用量與氯離子傳輸曲線之關係 42
4-3-2 粗骨材用量與氯離子擴散係數之關係 47
4-4 粗骨材用量與ACMT電流之關係 53
4-4-1 時間與電流發展關係 53
4-4-2 粗骨材用量與初始電流關係 53
4-5 ACMT電荷通過量 58
4-6 ACMT電荷通過量與氯離子累積濃度之關係 60
第五章 結論與建議
5-1 結論 62
5-2 建議 62
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