Abstract
Damping asphalt mixtures (DAMs) have been developed to resist vibration and noise caused by traffic loads, and the ultimate design goal in this process is to increase damping. However, while optimizing its damping characteristics, the viscoelastic properties are not yet clear. In the present study, two DAMs are designed based on the open-graded (OG) aggregate structure, and the viscoelastic properties are evaluated subsequently by the dynamic mechanical testing. The results show that the proposed mix-design method for DAMs can meet the mechanical requirements specified in the standards; DAMs are detected to have higher phase angle and lower stiffness modulus compared with traditional mixtures, and the antifatigue performance is excellent but resistance to rutting may face challenges.
Highlights
Today, complex transportation networks have become a symbol of urbanization. e convenient transportation has enriched people’s lives
Mix 1 and Mix 2 show similar levels of stiffness in the intermediate and low range of frequencies with Mix 1 becoming stiffer at lower temperatures and Mix 2 stiffer at higher temperatures
Compared with Mix ref, Damping asphalt mixtures (DAMs) (Mix 1 and Mix 2) obviously have a lower rutting parameter, indicating that its ability to resist rutting is weaker than that of traditional asphalt mixtures. is can be explained as follows: the large film thickness of mortar coating the aggregates in DAMs reduces the grain-to-grain contact in the aggregates skeleton and decreasing the stability of the mixture, which worsens the rutting resistance. erefore, the DAMs have resulted in being effective in absorbing vibrations when adopted in road pavements and track beds, the assessments of the ability to resist rutting need to be developed and the related mechanism should be analyzed as well in the future
Summary
Complex transportation networks have become a symbol of urbanization. e convenient transportation has enriched people’s lives. In the field of pavement engineering, the damping properties of viscoelastic materials included in asphalt mixtures are under investigation to reduce vibrations. One way to increase the damping properties of the DAMs is to use higher volumes of asphalt rubber (AR) compared to hot mix asphalt (HMA) prepared with traditional crumb rubber modifier (CRM) binder [27]. For this reason, the design of the DAM has the scope to accommodate a sufficient volume of AR to increase damping, while maintaining adequate stability and resistance. In order to verify the feasibility of the proposed mix-design method for DAMs, the basic mechanical properties will be characterized and compared with the requirements of the specification
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