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Optimizing Acoustic Performance of Semi-Dense Asphalt Mixtures Through Energy Dissipation Characterization
Huaqing Lv1, Gongfeng Xin2,3, Weiwei Lu1
1School of Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China.
Materials (Basel, Switzerland)
|September 13, 2025
Summary
Semi-dense graded asphalt mixtures (SDAMs) offer improved noise reduction by enhancing energy dissipation. This study links damping properties to noise reduction, validating SDAMs as a practical solution for traffic noise pollution.
Area of Science:
- Materials Science
- Environmental Engineering
- Acoustics
Background:
- Traffic noise pollution is a major environmental concern.
- Advanced noise-reducing pavement materials are needed.
- Semi-dense graded asphalt mixtures (SDAMs) balance acoustic performance and durability.
Purpose of the Study:
- To investigate the mechanism linking energy dissipation and noise reduction in SDAMs.
- To optimize SDAM design for noise mitigation.
- To evaluate the performance of novel SDAMs.
Main Methods:
- Designed and prepared SMA-6 TM, SMA-10 TM, and SMA-13 TM mixtures.
- Conducted water stability, high-temperature, and low-temperature performance tests.
- Performed dynamic modulus tests to calculate energy dissipation parameters (loss factor, damping ratio).
- Verified noise reduction using tire free fall and close-proximity (CPX) methods.
Main Results:
- SDAMs showed a performance trade-off: lower dynamic stability and reduced low-temperature performance, but comparable moisture stability.
- SDAMs exhibited superior damping with higher loss factors and damping ratios, peaking at 20 °C.
- A strong positive correlation (R² > 0.91) was found between loss factor and energy dissipation.
- The optimized SMA-10 TM mixture achieved 3-5 dB(A) noise reduction, meeting durability and water stability requirements.
Conclusions:
- Established a clear link between energy dissipation characteristics and noise reduction efficacy in SDAMs.
- Provided a theoretical framework for optimizing SDAM mixture design.
- Supported the wider application of SDAMs as an effective noise mitigation strategy for traffic noise pollution.
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