臺灣博碩士論文加值系統

The state of practice to combining RAP into slurry surfacing usually considered RAP binder as inactive and thus the RAP was used as ‘‘black rock”. This is because that the mixing process of the micro-surfacing was done in the ambient temperature that there is no high temperature can provide energy level to mobilize the RAP binder. However, during the service period of the micro-surfacing, the elevated pavement surface temperature and diffusion mechanism, contribution of RAP binder to the micro-surfacing makes possible. Therefore, the main objective of this study is investigate the level of contribution of the RAP binder to the cold mix asphalt-emulsion slurry system using direct observation and rheological of binder. The study was carried out in two pathways. The concept of using aggregate size to distinguish virgin aggregate and RAP and using the titanium dioxide (TiO2) as tracer. The other pathway was to employ the idea of diffusion zone and the sandwich sample concept to design four diffusion stages. The average thickness of the RAB layer calculated from the single artificial RAP aggregate was 100 μm and was used as a reference distance of RAB layer in the slurry mixture. Thus, the distance of the TiO2 outside the RAB layer to the boundary was calculated using CTAn software. The average distance of TiO2 for UCDN and CDN specimen are 190 μm and 500 μm, respectively. It indicates the diffusion mechanism exist in both conditioning cases. It can also observed that the TiO2 in the CDN specimen moved 2.5 times further than in the UCDN specimen. The relative migration distance of TiO2 in micro-CT respect to half distance between two artificial RAP aggregate was calculated. The percent travel was considered as diffusion depth and converted into three layer diffusion model as used in the DSR test. The ratio between diffusion layer and RAB layer was correspond to the ration between diffusion layer and RAB layer. This value was used in the interpolation to estimate the G* at such diffusion state from the G* at 25ºC and 60ºC spectrum for UCDN and CDN specimen, respectively. The G* of UCDN specimen and CDN specimen was 2.17-E06 Pa and 1.35-E05 Pa, respectively.

ABSTRACT I
DEDICATION II
ACKNOWLEDGEMENTS III
TABLE OF CONTENTS IV
LIST OF TABLES VI
LIST OF FIGURES VII
1 CHAPTER ONE INTRODUCTION 1
1.1 Background. 1
1.2 Research Objective 4
1.3 Thesis Organization 4
2 CHAPTER TWO LITERATURE REVIEW 6
2.1 Slurry Surfacing 6
2.2 Incorporating Reclaimed Asphalt Concrete into Micro-Surfacing Mixture 7
2.3 Diffusion Theory 7
2.4 Blending Mechanism 9
2.4.1 Mechanical and Interface Detection Approach 11
2.4.2 Direct Observation Approach 12
3 CHAPTER THREE RESEARCH METHODOLOGY 15
3.1 Materials. 16
3.1.1 Virgin Aggregate and RAP 16
3.1.2 Virgin Binder, RAB, and AE Residue 17
3.1.3 Titanium dioxide (TiO2) 20
3.2 Sample Preparation 21
3.2.1 X-Ray Micro-Computed Tomography (CT) 21
3.2.2 Dynamic Shear Rheometer (DSR) 23
3.3 Experimental Method. 25
3.3.1 X-Ray Micro-Computed Tomography (CT) 25
3.3.2 Dynamic Shear Rheometer (DSR) 27
4 CHAPTER FOUR RESULT AND DISCUSSION 29
4.1 X-Ray Micro-Computed Tomography 29
4.1.1 Image for AE residue, RAB and RAB mastic 29
4.1.2 Image for single artificial RAP aggregate sieve #4 and #8 30
4.1.3 Image for micro-CT specimen 31
4.2 Dynamic Shear Rheometer (DSR) 36
4.3 Correlation between Micro-CT image with G* spectrum 38
5 CHAPTER FIVE CONCLUSION AND SUGGESTION 42
5.1 Conclusion. 42
5.2 Recommendation. 43
REFERENCES 44

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