| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 93 === Asphalt concrete pavements can be recycled to reduce exploitation of river sandstone and waste of engineering, accordance with green environmental protection. Domestic and international research showed the use of recycled asphalt pavement (RAP) can improve the construction property of asphalt concrete and promote the performance of pavement.
In this study, the high level aged RAP was chosen to compacted the specimens about various content (0%, 20%, 40%, 60%, 80%) of RAP and the viscosity of mixture was controlled at 2000 poises in accordance with the mixture design was suggested by AI. The recycled asphalt concrete (RAC) mixed with recycling agents (RA) and softening agents (SA) was characterized in terms of IDT test, resistance to moisture induced damage test, air voids test, Cantabro test and fatigue test. And the results of these tests were compared to these of virgin mixtures. Finally, the compacted and loose specimens were curing at various days to examine the diffusion effect. The mastic of mixture, which was obtained by means of staged extraction, was used to determine the diffusion process that how much recycling agents was diffused into aged asphalt coating RAP aggregates.
The strength test results presented that use of RAP could reinforce the indirect tension strength and retained strength of the mixtures. And the strength of mixtures mixed with AC-10 or RA-75 were higher than other additive agents. The fatigue test results presented that use of recycling agents could reduce fatigue crack and improve the fatigue life of RAC. The diffusion test results presented that the main diffusion process occurred during 15 days and it is necessary to prevent the pavement from heavy load in this period.
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