臺灣博碩士論文加值系統

This study presented the results on the properties of concretes with conventional concrete by using natural fine aggregate and recycled fine aggregate. Also, the influence of incorporating silica fume on high performance recycled aggregate concrete was investigated. The research uses recycled aggregates (RA) that classified as recycled coarse aggregate (RCA) and recycled fine aggregates (RFA). The RA were totally washed and the properties of RA were determined. The Densified Mixture Design Algorithm was applied to design the mix proportion for high performance recycled aggregate concrete with the same water to binder is 0.3 and the slump was in the range of 210-230 mm. The effect of replacement natural coarse aggregate (NCA) by recycled coarse aggregate (RCA) with percentages 0%, 30%, 100% was studied. In addition, the influence of incorporating silica fume (SF) on high performance recycled aggregate concrete were studied with percentages 0%, 5%, 10%, 15%. Test results indicated that the compressive strength of recycled aggregate concretes (RAC) were in the range of 43–57.5 MPa at age¬ of 28 days. Using the SF (5%) to replace the cement content was found to be an optimal value to create RAC with excellent durability and engineering properties. The durability performance of RAC mixtures by DMDA is excellent.

This study presented the results on the properties of concretes with conventional concrete by using natural fine aggregate and recycled fine aggregate. Also, the influence of incorporating silica fume on high performance recycled aggregate concrete was investigated. The research uses recycled aggregates (RA) that classified as recycled coarse aggregate (RCA) and recycled fine aggregates (RFA). The RA were totally washed and the properties of RA were determined. The Densified Mixture Design Algorithm was applied to design the mix proportion for high performance recycled aggregate concrete with the same water to binder is 0.3 and the slump was in the range of 210-230 mm. The effect of replacement natural coarse aggregate (NCA) by recycled coarse aggregate (RCA) with percentages 0%, 30%, 100% was studied. In addition, the influence of incorporating silica fume (SF) on high performance recycled aggregate concrete were studied with percentages 0%, 5%, 10%, 15%. Test results indicated that the compressive strength of recycled aggregate concretes (RAC) were in the range of 43–57.5 MPa at age¬ of 28 days. Using the SF (5%) to replace the cement content was found to be an optimal value to create RAC with excellent durability and engineering properties. The durability performance of RAC mixtures by DMDA is excellent.

Table of Contents
ABSTRACT i
ACKNOWLEDGEMENTS iii
English and Greek Alphabetical Notations iv
List of Tables viii
List of Figures ix
Chapter 1 Introduction 1
1.1 Motivation of the research 1
1.2 Aim and objective of the research 2
1.3 Flow chart of experimental works 2
Chapter 2 Literature Review 4
2.1 Overview of high-performance concrete 4
2.2 The role of mineral admixture in concrete 5
2.2.1 Role of Fly Ash (FA) in concrete 6
2.2.2 Role of Silica Fume (SF) in Concrete 7
2.3 Overview of application of recycled aggregate concrete 8
2.4 Literature reviews on the use of combined recycled aggregate and pozzolanic materials in high performance concrete. 11
2.5 Mixture design procedure 18
2.5.1 ACI method 19
2.5.2 Densified mixture design algorithm (DMDA) method 24
2.5.3 Standard Operating Procedure (SOP) for laboratory concrete mixing 37
2.5.4 Remarks for mixture proportion. 38
Chapter 3 Materials and experimental methods 41
3.1 Experiment planning 41
3.2 Production process of recycled aggregate. 42
3.3 Materials properties 43
3.3.1 Portland cement, fly ash, slag, silica fume 43
3.3.2 Coarse and fine aggregates 44
3.3.3 Recycled Coarse and fine aggregates 46
3.3.4 Superplasticizer and mixing water 49
3.4 Experimental methods and laboratory equipment 50
3.4.1 Mix proportions 50
3.4.2 Properties of fresh concrete 50
3.4.3 Engineering properties of hardened concrete 51
3.4.4 Durability properties of hardened concrete 55
Chapter 4 Results and Discussions 64
4.1 Properties of fresh concrete 64
4.1.1 Workability 64
4.1.2 Unit weight 66
4.2 Engineering properties of hardened concrete 66
4.2.1 Compressive strength 66
4.2.2 Splitting tensile strength 71
4.2.3 Drying shrinkage 73
4.3 Durability properties of hardened concrete 75
4.3.1 Chloride-ion penetration resistivity 75
4.3.2 Electrical surface resistivity 78
4.3.3 Ultrasonic pulse velocity 81
Chapter 5 Conclusions and Suggestions 85
5.1 Conclusion 85
5.2 Suggestions 85
References 86

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