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研究生：	郭承恩 Kuo, Cheng-En
論文名稱：	帶缺口與不帶缺口試體確定超高性能纖維混凝土之拉伸性質 Notched versus Unnotched Specimens for Determining the Tensile Properties of Ultra-High Performance Fiber Reinforced Concrete
指導教授：	阿力 Sturm, Alexander
學位類別：	碩士 Master
系所名稱：	工學院 - 土木工程學系 Department of Civil Engineering
論文出版年：	2024
畢業學年度：	112
語文別：	英文
論文頁數：	124
中文關鍵詞：	缺口、拉伸性質、超高性能纖維混凝土
外文關鍵詞：	notch, tensile properties, ultra-high performance fiber reinforced concrete (UHPFRC)
相關次數：	點閱：35 下載：8
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缺口的存在會導致試體內的應力集中。為了進一步研究缺口對超高性能纖維混凝土試體拉伸性質的影響，本研究製作了30個斷面尺寸為150毫米 × 150毫米、長度為600毫米的短梁試體。其中15個試體在梁底部切割深度為15毫米、寬度為3毫米的缺口。同時，研究考慮了不同纖維類型和不同纖維體積的影響，以進行抗彎試驗。此外，還製作了18個斷面尺寸為80毫米 × 80毫米、長度為460毫米的狗骨頭試體。其中9個試體在中心部位的兩側切割深度為5毫米、寬度為3毫米的缺口，並考慮了不同纖維體積下的直接拉伸試驗。實驗結果表明，缺口的存在確實提高了試體的強度。然而，隨著纖維體積的增加，缺口的增強或改善效果減弱，甚至可能降低試體的強度。基於此，還提出了關於如何使用直接拉伸試驗和彎曲試驗結果來預測超高性能纖維混凝土拉伸性質的建議。

The presence of notches leads to stress concentrations in specimens. To further investigate the effect of notches on the tensile properties of ultra-high performance fiber reinforced concrete (UHPFRC) prism, this study fabricated 30 beam specimens with a cross-section of 150mm × 150mm and a length of 600mm. Among these, 15 specimens had notches with a depth of 15mm and a width of 3mm cut at the bottom of the beams. Meanwhile, the effect of fiber type and fiber volume fraction was also considered to explore flexural tests. Additionally, 18 dogbone specimens with a cross-section of 80mm × 80mm and a length of 460mm were produced. Among these, 9 specimens had notches with a depth of 5mm and a width of 3mm cut on both sides of the central section, and were subjected to direct tension tests with different fiber volume fraction. The experimental results show that the presence of notches indeed increases the characteristic strength of the specimens. However, as the fiber volume increases, the enhancement or improvement of the notches alleviates, and may even decrease the strength of the specimens. From this recommendations were also made about how the results of direct tension and flexural tests should be used to predict the tensile performance of UHPFRC.

摘要	i
ABSTRACT	ii
ACKNOWLEDGMENT	iii
TABLE OF CONTENTS	iv
LIST OF TABLES	vii
LIST Of FIGURES	ix
CHAPTER 1 INTRODUCTION	1
1 Motivation and objective	1
CHAPTER 2 LITERATURE REVIEW	3
1 Ultra-High Performance Concrete	3
1.1 Ultra-High Performance Concrete	3
1.2 Steel fiber	6
2 Flexural prism test	12
3 Direct tension test	18
4 Analysis method	20
4.1 EN 14651:2005	20
4.2 NF P-18 470	24
4.3 AS3600:2018	28
4.4 ASTM C1609	31
5 Summary	33
CHAPTER 3 EXPERIMENT PROJECT	34
1 Specimen design	34
1.1 Shape of prism specimen	34
1.2 Shape of dogbone specimen	37
1.3 Designation	39
2 Material and mixture proportion	41
2.1 Materials	41
2.2 Mixture proportion	46
3 Specimen fabrication	47
3.1 Preliminary preparation	47
3.2 Casting	49
3.3 Demolding and curing	52
4 Specimen setup	55
4.1 Prism specimen	55
4.2 Dogbone specimen	59
4.3 Apparatus	61
4.4 Instrumentation	62
5 Test procedure	63
CHAPTER 4 RESULTS	64
1 Cylinder compression test	64
2 Unnotched flexural prism test	66
2.1 S13-1-U	67
2.2 S13-2-U	68
2.3 S13-3-U	69
2.4 H35-1-U	70
2.5 H35-2-U	71
3 Notched flexural prism test	73
3.1 S13-1-N	73
3.2 S13-2-N	74
3.3 S13-3-N	75
3.4 H35-1-N	76
3.5 H35-2-N	77
4 Unnotched direct tensile test	80
4.1 S13-1-M	80
4.2 S13-2-M	81
4.3 S13-3-M	82
5 Notched direct tensile test	84
5.1 S13-1-NM	84
5.2 S13-2-NM	85
5.3 S13-3-NM	86
CHAPTER 5 DISCUSSION	88
1 Flexural prism test	88
1.1 Comparison of the effect of notch	88
1.2 Comparison of the effect of fiber volume	89
1.3 Comparison of the effect of fiber type	90
2 Direct tension test	91
2.1 Comparison of the effect of notch	91
2.2 Comparison of the effect of fiber volume	93
2.3 Stress-strain relationship	94
2.4 Stress-crack width relationship	96
3 Analysis approaches	97
3.1 Comparison of the different analysis approaches	97
3.2 Additional factor for AS3600:2018 approach for UHPC	99
CHAPTER 6 CONCLUSION	101
CHAPTER 7 REFERENCES	102
CHAPTER 8 APPENDIX	104
1 Cylinder compression strength	104
2 Unnotched flexural prism test	108
                                    

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