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研究生:阮秋香
研究生(外文):Nguyen ThuHuong
論文名稱:以交流阻抗法評估混凝土材料之抗壓強度
論文名稱(外文):STRENGTH ESTIMATION OF CONCRETE MATERIALS USING A.C. IMPEDANCE SPECTROSCOPY
指導教授:侯琮欽
指導教授(外文):Tsung-Chin Hou
學位類別:碩士
校院名稱:國立成功大學
系所名稱:土木工程學系碩博士班
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:英文
論文頁數:72
外文關鍵詞:Electrochemical Impedance Spectroscopy (EIS)ConcreteCompressive strengthBulk resistanceBulk resistivityCut-off frequency
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  • 被引用被引用:0
  • 點閱點閱:230
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  • 下載下載:38
  • 收藏至我的研究室書目清單書目收藏:0
Currently, considerable attention has been paid to measuring and interpreting the electrical properties of cement-based structural elements such as those made of concrete. Among those, electrical measurement was initially used as an investigative technique for monitoring hydration process of Portland cement. So far, the applications have been broadly expanded as a potentially powerful method in characterizing microstructural evolution and pore structure development in cementitious materials. Hence, electrical properties measurement can provide beneficial information about the material compositions and mechanical properties of concrete. One of the most important mechanical properties of concrete is the mechanical strength. This research develops some of the current advancements in electrical property measurement of concrete materials in order to investigate the relationship between electrical resistivity of concrete and the corresponding mechanical strength. Moreover, this research aims to use electrical resistivity for prediction strength of concrete non-destructively, as a new approach.
Electrical Impedance Spectroscopy (EIS) technique was used for four concrete mixtures, with two-terminal probe method. Impedance spectra obtained by EIS of the concrete samples were investigated as function of the specimen age. Compressive strength test was performed using same cylindrical material components and at the same age of specimens. Two important parameters of the impedance spectra, bulk resistance and cut-off frequency, are found to be correlated with concrete strength gain during curing of each mixture. These relationships were also considered among different mixtures at the same age.
Base on our results, we have shown that the strength of concrete can be numerically estimated by the A.C. features of cementitious materials. The experimental data indicate that: as the strength of concrete increases, the bulk resistance/bulk resistivity increases; while the cut-off frequency decreases. Then, the equations for estimating strength of concrete were obtained. Finally, further research issues will be suggested for implementation of the proposed approach.

Abstract I
Acknowledgement II
Contents III
List of Tables V
List of Figures VI
Chapter 1 : Introduction 1
1.1 Background 1
1.2 Objective and Scopes 4
1.3 Thesis Outline 5
Chapter 2 : Literature Review 6
2.1 Hydration of Portland Cement 6
2.2 Electrical Measurements of Cement-based Materials 8
2.3 EIS Theory: Spectra Features, Equivalent Circuit Model. 10
2.4 Resistivity and Conductivity of Cementitious Materials 17
2.5 Relationship between Compressive Strength and Microstructure of Concrete 20
2.6 Summary 21
Chapter 3 : Investigation Strategies 23
Chapter 4 : Materials and Experimental Procedures 25
4.1 Materials and Mixing Details 25
4.2 Compressive Strength Test 27
4.3 A.C Impedance Measurements 28
Chapter 5 : Results and Discussion 32
5.1 Result of Compressive Strength Tests 32
5.2 Result of EIS Tests 33
5.2.1 Overview of Impedance Response 33
5.2.2 Relationship between Bulk Resistance and Microstructure of Concrete 46
5.3 Strength Prediction of Concrete Using Bulk Resistance and Bulk Resistivity 52
5.4 Strength Prediction of Concrete Using Cut-off Frequency 55
Chapter 6 : Conclusion and Future Work 59
Reference 61
Appendix 65

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