Investigation of Fine Asphalt Concrete Mixture Gradations with Improved Durability
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Authors
Raveendran, Nishanthan
Issue Date
2023
Type
Thesis
Language
Keywords
Alternative Title
Abstract
The durability of asphalt mixtures is crucial in determining road pavements' durability and overall performance. One aspect that influences the durability of asphalt mixtures is the gradation of the mixture. This thesis examines the impact and performance of fine aggregate dense gradation on the durability of asphalt mixtures.Several studies have reported that asphalt mixtures with finer aggregate gradations exhibit lower air void content and higher moisture damage resistance than coarser aggregate gradations. Moreover, finer gradations have enhanced the stiffness and strength of asphalt mixtures, resulting in improved resistance to permanent deformation and fatigue cracking.
However, the fine aggregate dense gradation has also been reported to negatively impact the durability of asphalt mixtures. For instance, the finer particles tend to fill the voids between coarse aggregates, leading to reduced permeability, which can lead to more damage from freeze-thaw cycles. Furthermore, finer aggregate gradations can make asphalt mixtures more susceptible to rutting at high temperatures.
In conclusion, the fine aggregate ease gradation is a critical factor that affects the durability of asphalt mixtures. Carefully considering the fine aggregate gradation when designing asphalt mixtures is crucial to ensure long-lasting and sustainable pavement infrastructure. Achieving a well-balanced mixture of stability and durability, as determined by its susceptibility to rutting and cracking, shows potential when the aggregate gradation is optimized. Further research is recommended to explore the optimal gradation of fine aggregate ease that balances the benefits and drawbacks of various gradation sizes with different aging levels.