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研究生:Mewael Tesfamariam
研究生(外文):Mewael Tesfamariam
論文名稱:The study of the effect of fibers on the properties of self-consolidating concrete with rice husk ash and fly ash
論文名稱(外文):The study of the effect of fibers on the properties of self-consolidating concrete with rice husk ash and fly ash
指導教授:黃兆龍黃兆龍引用關係
指導教授(外文):Chao-Lung Hwang
口試委員:黃兆龍
口試委員(外文):Chao-Lung Hwang
口試日期:2013-12-26
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:營建工程系
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:2014
畢業學年度:102
語文別:英文
論文頁數:112
中文關鍵詞:FiberRice husk ashFly ashDMDA methodSCC
外文關鍵詞:FiberRice husk ashFly ashDMDA methodSCC
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The synergy between fiber reinforced concrete technologies and high volume pozzolanic material added self-consolidating concretes (SCC) may have motivating superior advantages that can be exploited by many concrete industries. The inclusion of fibers primarily for the improvements of mechanical properties of concrete such as weakness in tension, more brittle behavior and propagation of cracks. However, the casting of fiber reinforced concrete requires greater care of construction, more deliberate planning and workmanship than the normal concrete without fibers. Additionally for effective benefits of fibers on the concrete properties; the self-compactness of the concrete will play a great roll for better controlled fiber dispersion randomly throughout the concrete matrix. On the other hand, concrete construction industry is not a sustainable technology and an environmentally friendly process for many reasons. One of the main reason may be the principal key ingredient of concrete as binder is Portland cement and its production for clinker becomes a major contributor to the man-made CO2 greenhouse gas emissions in global warming and climate change. Therefore, in this study solid industrial by-products of fly ash and a ground residual rice husk ash from steam boiler were replaced the Portland cement by more than 50% as a binder for the fiber reinforced SCCs production. To investigate the effects of fibers on the properties of the rice husk ash added high volume fly ash SCC; two types of fibers, polypropylene (PP) and steel fibers (SF) with the inclusion dosage of each 0.4%, 0.8% and 1.2% by volume of concrete were used. And also a hybrid fiber (HF) which is a combine of PP and SF were used to identify the clear effect of fibers. Then the fiber reinforced SCCs were compared with two control self-consolidating concretes without fibers, the one with similar composition mixture of the fiber reinforced concrete and the other with fully Portland cement as binder.
The workability of the concretes was assessed for better fibers distribution control and orientation, and homogeneity of the concrete by slump flow test for filling ability, T50 and V-funnel testes for viscosity and J-ring test for passing ability. Even though the inclusion of both steel and polypropylene fibers were hinder the flow characteristics of SCC but by strictly following Densified Mixture Design Algorithm (DMDA) and with the help of high dosage of superplasticizer all mix proportions were controlled to slump flow range of 660 – 750 mm. The mechanical hardened properties of all concretes were carried out by compressive strength, splitting tensile strength, flexural strength, drying shrinkage, and dynamic modulus of elasticity and rigidity. Furthermore, the addition of fibers were asses the durability investigation by chloride-ion penetration, electrical surface resistivity, ultrasonic pulse velocity and sulfate attack. The hardened properties of all concretes with and without fiber addition founds that generally good durable performance. Moreover, the 91 days average compressive strength of the steel and polypropylene fiber reinforced SCCs were obtained within the range of 54 – 65MPa and 36 – 38MPa respectively. Whereas the two control concretes without fiber were obtained a 91 days average compressive strength of 41 and 46MPa for the concrete with the same composition matrix as the fiber reinforced concretes and the other with fully Portland cement as binder respectively.
The synergy between fiber reinforced concrete technologies and high volume pozzolanic material added self-consolidating concretes (SCC) may have motivating superior advantages that can be exploited by many concrete industries. The inclusion of fibers primarily for the improvements of mechanical properties of concrete such as weakness in tension, more brittle behavior and propagation of cracks. However, the casting of fiber reinforced concrete requires greater care of construction, more deliberate planning and workmanship than the normal concrete without fibers. Additionally for effective benefits of fibers on the concrete properties; the self-compactness of the concrete will play a great roll for better controlled fiber dispersion randomly throughout the concrete matrix. On the other hand, concrete construction industry is not a sustainable technology and an environmentally friendly process for many reasons. One of the main reason may be the principal key ingredient of concrete as binder is Portland cement and its production for clinker becomes a major contributor to the man-made CO2 greenhouse gas emissions in global warming and climate change. Therefore, in this study solid industrial by-products of fly ash and a ground residual rice husk ash from steam boiler were replaced the Portland cement by more than 50% as a binder for the fiber reinforced SCCs production. To investigate the effects of fibers on the properties of the rice husk ash added high volume fly ash SCC; two types of fibers, polypropylene (PP) and steel fibers (SF) with the inclusion dosage of each 0.4%, 0.8% and 1.2% by volume of concrete were used. And also a hybrid fiber (HF) which is a combine of PP and SF were used to identify the clear effect of fibers. Then the fiber reinforced SCCs were compared with two control self-consolidating concretes without fibers, the one with similar composition mixture of the fiber reinforced concrete and the other with fully Portland cement as binder.
The workability of the concretes was assessed for better fibers distribution control and orientation, and homogeneity of the concrete by slump flow test for filling ability, T50 and V-funnel testes for viscosity and J-ring test for passing ability. Even though the inclusion of both steel and polypropylene fibers were hinder the flow characteristics of SCC but by strictly following Densified Mixture Design Algorithm (DMDA) and with the help of high dosage of superplasticizer all mix proportions were controlled to slump flow range of 660 – 750 mm. The mechanical hardened properties of all concretes were carried out by compressive strength, splitting tensile strength, flexural strength, drying shrinkage, and dynamic modulus of elasticity and rigidity. Furthermore, the addition of fibers were asses the durability investigation by chloride-ion penetration, electrical surface resistivity, ultrasonic pulse velocity and sulfate attack. The hardened properties of all concretes with and without fiber addition founds that generally good durable performance. Moreover, the 91 days average compressive strength of the steel and polypropylene fiber reinforced SCCs were obtained within the range of 54 – 65MPa and 36 – 38MPa respectively. Whereas the two control concretes without fiber were obtained a 91 days average compressive strength of 41 and 46MPa for the concrete with the same composition matrix as the fiber reinforced concretes and the other with fully Portland cement as binder respectively.
Abstract i
Acknowledgements iii
List of Tables vii
List of Figures viii
English and Greek Alphabetical Notations xi
Chapter I
Introduction
1.1 General Introduction 1
1.2 Aim and Objective of the research 2
1.3 Thesis organization 3
1.4 Research organization flow chart 4
Chapter II
Literature Review
2.1 Historical and recent overviews of using fly ash and rice husk ash in concrete 7
2.2 Historical and recent overviews of fiber application in concrete 10
2.3 Historical and recent overviews of Self-consolidating concrete 13
2.4 Literature reviews in combination of fiber reinforced concrete with high volume pozzolanic materials self-consolidating concrete 13
2.5 Thesis significance in comparison to the previous study 24
Chapter III
Materials properties, experimental test programs and mixture proportion design
3.1 Material properties 31
3.1.1. Portland cement, fly ash and rice husk ash 31
3.1.2. Coarse and fine aggregates 33
3.1.3. Steel and polypropylene fibers 34
3.1.4. Superplasticizer and mixing water 35
3.2. Experimental test methods and apparatus 35
3.2.1. Workability properties of fresh concrete 35
3.2.2. Mechanical properties of hardened concrete 38
3.2.3. Durability properties of harden concrete 43
3.3. Mix design procedure 51
3.3.1. Review of some previous methods of mix design for SCC 51
3.3.2. Densified mixture design algorithm method 53
3.3.3. SCC mix design by ACI method 63
3.3.4. Standard Operating Procedure (SOP) for laboratory Concrete mixing67
Chapter IV
Results and Discussions
4.1. Mix proportion parameters and design concepts 71
4.2. Workability properties of fresh concrete 72
4.2.1. Filling ability or flow-ability test 74
4.2.2. Viscosity test 76
4.2.3. Passing ability test 76
4.2.4. Unit weight 77
4.3. Mechanical properties of hardened concrete 77
4.3.1. Compressive strength 77
4.3.2. Splitting tensile strength 81
4.3.3. Flexural strength 84
4.3.4. Dynamic modulus of elasticity and rigidity 90
4.3.5. Drying shrinkage 91
4.4. Durability properties of harden concrete 94
4.4.1. Chloride-ion penetration resistivity 94
4.4.2. Electrical surface resistivity 96
4.4.3. Ultrasonic pulse velocity 98
4.4.4. Sulfate attack resistivity 100
Chapter V
Conclusion and Suggestions 103
References 106
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