臺灣博碩士論文加值系統

As the most popular construction material, concrete has many advantages compared to other materials. However, its brittle nature causes cracking and results in many deterioration problems and failures in infrastructures. Considering the issue of sustainability, researchers around the world have conducted numerous studies to develop concrete that has better performances, higher durability, longer life span, and less damaging effects to nature. To obtain such characteristics, researchers not only focus on strength enhancement, but also ductility and toughness.
This thesis examines the effect of using ground granulated blast furnace slag as partial cement replacement in producing engineered cementitious composite (ECC), a ductile cementitious composite reinforced with short random PVA-fiber. Slag replacement is not only to increase the strength but also to create better fiber bridging property that results in better ductility of the material. Variables involved in the mixture proportions are the amount of slag replacement, slag fineness, and water content. The mechanical behaviors of ECC under uniaxial tensile tests and flexural tests as parameters to measure its ductility will be reported.

CONTENTS

ABSTRACT i
ACKNOWLEDGMENT ii
CONTENTS iv
LIST OF FIGURES viii
LIST OF TABLES xii
CHAPTER 1 INTRODUCTION 1
1.1 Background and Motivation 1
1.2 Research Objectives 5
1.3 Thesis Organization 6
CHAPTER 2 LITERATURE REVIEW 7
2.1 Fiber Reinforced Concrete 7
2.2 High Performance Fiber Reinforced Cementitious Composites 9
2.3 Engineered Cementitious Composites 13
2.3.1 Micromechanics and Properties 16
2.3.2 Reinforced ECC as Structural Member 25
2.3.3 Structural Application 28
2.4 Polyvinyl Alcohol Fiber 34
2.5 Ground Granulated Blast Furnace Slag 37
2.5.1 Origin and Definition 39
2.5.2 Composition 40
2.5.3 Standard Specification and Classification 43
2.5.4 Effects of Application in General Concrete 44
2.6 Properties of Fiber Reinforced Cementitious Composites 46
2.6.1 Compressive Strength 46
2.6.2 Workability 46
2.6.3 Flexural Strength 48
2.6.4 Toughness 50
2.6.5 Tensile Strength 52
2.6.6 Modulus of Elasticity 53
2.6.7 Other Properties 54
CHAPTER 3 EXPERIMENTAL STUDY 55
3.1 Materials 55
3.1.1 Cement 55
3.1.2 Water 55
3.1.3 Sand 56
3.1.4 Slag 57
3.1.5 Fiber 58
3.1.6 High Range Water Reducing Admixture 59
3.1.7 Methylcellulose 60
3.1.8 Anti foaming agent 61
3.2 Instruments and Apparatus 61
3.2.1 1000 kN and 100 kN MTS 810 Universal Testing Machine 61
3.2.2 MTS 458.20 Micro-Console Controller 62
3.2.3 MTS 647 Hydraulic Wedge Grip 62
3.2.4 Data Collector 63
3.2.5 Concrete Mixers 63
3.2.6 Flow Table and Caliper 64
3.2.7 Vibrating Table 64
3.2.8 Scale 65
3.2.9 Molds 66
3.2.10 Third Point Loading Flexural Test Device 68
3.2.11 Grinding Machine 69
3.2.12 LVDT 69
3.2.13 Strain Gauges 71
3.3 Experimental Procedures 71
3.3.1 Mixing 71
3.3.2 Casting 73
3.3.3 Flow Table Test 74
3.3.4 Curing 75
3.3.5 Testing 75
CHAPTER 4 EXPERIMENTAL RESULTS AND DISCUSSIONS 81
4.1 Compression Test 81
4.1.1 Compressive Strength 81
4.1.2 Modulus of Elasticity 83
4.2 Flexural Test 84
4.2.1 First Peak Strength 85
4.2.2 Modulus of Rupture and Corresponding Deflection 86
4.2.3 Toughness 87
4.3 Tensile Test 88
4.3.1 Critical Points 88
4.3.2 Toughness 90
4.4 Flow Table Test 91
CHAPTER 5 CONCLUSIONS AND SUGGESTIONS 92
5.1 Conclusions 92
5.2 Suggestions 94
REFERENCES 95
APPENDIX A FLEXURAL TEST RESULTS
APPENDIX B TENSILE TEST RESULTS
APPENDIX C UNSELECTED CURVES OF TENSILE AND FLEXURAL TEST

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