| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 106 === The traffic volume and loading are increasing with the growth of economic in Taiwan. The maintenance of pavement induces large amounts of Reclaimed Asphalt Material (RAM) every year. However, according the government policy the maximum amount of RAM allowable to mix with fresh asphalt mixture is 40%. Hence, the accumulation of RAM becomes a series problem impacting the environment. Cold recycled asphalt concrete has the workability at ambient temperature by using emulsified asphalt. The emulsified asphalt technology is widely used in the mixture with 100% RAM and it can be applied to the base and sub-base layer in pavement structures. The cold recycled asphalt mixture can effectively improve the safety during construction and significantly reduced the impact on the environment during the production and paving of asphalt mixtures. However, a systematic mix design procedure of cold recycled asphalt mixture using emulsified asphalt is still desired. Hence, the objective of this research is to develop a systematic design method for cold-mixed emulsified asphalt with RAM materials and to explore its volume characteristics. Moreover, this research also evaluated the effect of compacting temperature and conducted the performance tests such as wheel tracking test.
The results show that the strength of the mixture decreases with low water content because the mixture cannot be uniform during mixing process. In terms of the curing days, the strength after two days reached about 95% of the maximum strength. The optimum emulsified bitumen content curing by ambient and oven-heating temperature is decreased from 4.8% to 3.8%, and the strength of the emulsified mixture is also significantly improved by oven-heating. For the volume characteristics, it can be found that the void decreases with increasing emulsified bitumen content. In the performance test, according to the results of the wheel tracking test, 2% and 4 % emulsified bitumen content can reach 1000 times/mm standard requirement; however, for Cantabro test, low emulsified bitumen such as 2% causes a lot of mass loss.
|
|---|
