| Summary: | 碩士 === 義守大學 === 土木與生態工程學系 === 102 === The study of biofuel applied to the reclaimed asphalt concrete In this study, biofuel is
applied to replace part of asphalt binder. Then, this asphalt binder with biofuel replacement
is used in the reclaimed asphalt concrete. The object of this study is to investigate the effects
of biofuel replacement on the properties of reclaimed asphalt concrete. Five different
amounts of asphalt binder, 0, 2, 4, 6, and 8%, are replaced by the biofuel. To assess the
applicability of asphalt binder replaced by different levels of biofuel, the Marshall mix
designs and the related mechanical tests are performed in this study. The test results show
that the viscosities of reclaimed asphalt concrete decrease with the increase level of biofuel
replacement. Moreover, when the biofuel replacement is larger than 4%, apparent decreases
of viscosity, stability, and flowability are observed. Hence, to obtain better performances in
stability and mechanical properties of asphalt concrete, it suggests that the biofuel
replacement should be less than 4%.
The study also shows that, when the biofuel is applied as additive to the reclaimed asphalt
concrete, the resistance to tensile cracks on pavement is effectively improved. Furthermore,
the bearing capacity of reclaimed asphalt concrete pavement with 2 or 4% biofuel
replacement is better performed than that of pavement with no biofuel replacement.
However, the bearing capacity is reduced when the amount of biofuel replacement is more
than 4%. Moreover, results obtained from soaked stripping tests show that the resistance to
stripping clearly reduced when the amounts of biofuel replacement are higher than 4% in
reclaimed asphalt concrete pavement. It suggests that the maximum level of biofuel
replacement should be less than 4% in the application to the reclaimed asphalt concrete.
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