臺灣博碩士論文加值系統

本研究利用加速氯離子移動試驗(accelerated chloride migration test, ACMT)來探討氯離子於水泥基複合材料中之傳輸行為；使用的水泥基複合材料分別為水泥砂漿與混凝土兩種；其中混凝土配比為考量礦物摻料的使用；水泥砂漿配比則考量不同骨材體積比。
本試驗利用外加電場機制來加速氯離子移動。試驗期間量測陰陽極電流的變化以及陽極槽氯離子濃度。由陽極槽氯離子累積濃度與時間關係圖觀之，可將氯離子傳輸歷程分為起始期、穩態期、與衰退期；而氯離子擴散係數則可以由穩態期量測之氯離子通過量，利用Nernst-Planck方程式計算求得。
試驗結果顯示混凝土中添加礦物摻料可降低氯離子移動速率，且穩態期的電流平均值與氯離子擴散係數均呈一線性關係，而陽極槽氯離子累積濃度亦與電荷量呈現線性相關性。
在水泥砂漿中，骨材對於氯離子的移動有阻隔效應、迂迴效應、與界面過渡區的影響，其中以阻隔效應為主。陽極槽氯離子累積濃度亦與電荷量有線性相關性。且其迴歸曲線斜率與混凝土所得結果相近。此外試驗期間，亦同時量測陰、陽極兩槽氯離子濃度變化，發現陰極槽氯離子濃度遞減速率與陽極槽氯離子移動速率有關，且陰極槽氯離子濃度亦與電荷量有線性相關性。表示ACMT所量測到的電荷量可以快速用來預估陽極槽氯離子移動速率。

In this study the accelerated chloride migration test (ACMT) was used to investigate the transport phenomenon of chloride ion in cement-based composites materials. This method accelerating the chloride ion was by applying an electrical potential. Two groups of cement-based composite materials, four concretes with various mineral admixtures and six mortars with various ratios of aggregate volume fraction were cast and tested. In this study, the electric current, and the chloride ion concentration in the anode cell were continuous measured during the test. During the test, there are three stages exist, initial period, steady-state period, and attenuate period with respect to the change of the chloride-ion concentration. The chloride-ion diffusion coefficient of the cement-based composites materials was calculated using the constant flux of steady-state period on the basis of the Nernst-Planck equation.
The chloride-ion diffusion coefficient of concrete indicates that the mineral admixtures can reduce the chloride permeability of concrete and a good correlation between the average values of current in steady-state period and chloride ions diffusion coefficient was observed. And the charge passed was correlated linearly with the chloride-ion concentration in the anode cell regardless of concrete mixes.
Test results of mortar can be used to study the effects of aggregate in the cement-based composites on dilution, tortuosity, and interfacial transition zone. A good correlation linearly trend exists between the chloride-ion concentration in the anode cell and the charge passed. And the slope of the regression line for mortars was similar to that of concretes. It appeared that the charge passed was correlated linearly with the chloride-ion concentration regardless of cement-based composites materials. The chloride-ion concentration in the cathode cell was also continuous determination during the test. A good correlation between the charge passed and the chloride-ion concentration in the cathode cell was also observed. Moreover, a good correlation exists between the chloride-ion migration rate in the anode cell and chloride-ion decreasing rate in the cathode cell. It appears that the charge passed of ACMT can provide a rapid method to predict the chloride-ion migration rate in the anodic cell.

摘要 I
Abstract II
目錄 IV
圖目錄 VII
表目錄 XII
第一章 緒論 1
1-1 前言 1
1-2 研究目的 3
1-3 架構與內容 5
第二章 文獻回顧 7
2-1 水泥基複合材料離子傳輸行為 7
2-2 影響氯離子傳輸行為之材料因子 11
2-2-1 水泥質漿體基材 11
2-2-2 骨材 21
2-3 氯離子傳輸相關試驗 26
2-3-1 濃度梯度法 26
2-3-2 外加電場法 29
第三章 試驗計畫 35
3-1 配比設計 37
3-1-1 混凝土 37
3-1-2 水泥砂漿 38
3-2 組成材料性質 39
3-2-1 拌合水 40
3-2-2 膠結材料 40
3-2-3 強塑劑 42
3-2-4 粗骨材 42
3-2-5 細骨材 44
3-3 試驗方法與設備 45
3-3-1 氯離子快速滲透試驗（RCPT） 46
3-3-2 加速氯離子移動試驗（ACMT） 50
3-3-3 氯離子濃度量測（電位滴定法） 52
3-3-4 氯離子濃度量測（離子層析法） 54
3-3-5 硬固水泥基材料氯離子含量量測 56
3-3-6 力學性質試驗 57
第四章 RCPT與ACMT之電化學系統 58
4-1 陰極槽 58
4-2 陽極槽 59
4-3 水泥基複合材料試體 62
第五章 結果與討論 63
5-1 基材對水泥基複合材料氯離子傳輸行為之影響 64
5-1-1 氯離子傳輸歷程 64
5-1-2 氯離子移動速率與擴散係數 68
5-1-3 遲滯時間 72
5-1-4 壓力強度與氯離子擴散係數 75
5-1-5 電流與電量 77
5-1-6 氯離子濃度與電量 94
5-2 骨材量對水泥基複合材料氯離子傳輸行為之影響 99
5-2-1 氯離子移動速率 101
5-2-2 遲滯時間 104
5-2-3 骨材量之影響 107
5-2-4 電流與電量 120
5-3 電荷量與陰陽極槽氯離子濃度變化之關係 135
5-3-1 水泥砂漿配比陰極槽氯離子濃度變化 137
5-3-2 電荷量與陰極槽氯離子濃度變化之關係 141
第六章 結論與建議 148
6-1 結論 148
6-2 建議 149
參考文獻 151

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