Acoustic maintenance and sustainability of low-noise road surfaces: Findings from INTER.NOISE 2024

1. acoustic maintenance of low-noise road surfaces by grinding

The acoustic performance of low-noise road surfaces decreases over time due to mechanical wear and clogging of porous structures. However, targeted maintenance by grinding can restore and optimise the noise-reducing properties of these surfaces.

• Micro-milling as a standard technology: The use of micro-milling can significantly improve the acoustic properties of pavements. This technology is increasingly establishing itself as the standard in the maintenance of low-noise road surfaces.
• Results of an international comparison: In collaboration with G+P and Weibel AG, we presented the results of 17 milled pavements to an international audience at INTER.NOISE 2024. The results showed that an extension of the acoustic service life by 2-4 years can be achieved. This not only leads to a reduction in costs, but also reduces the ecological impact and minimises the impact of construction sites in urban areas.

2. sustainability of low-noise road surfaces: A life cycle analysis

In addition to acoustic maintenance, environmental sustainability is a key aspect in the evaluation of low-noise road surfaces. In our second presentation, together with G+P, HKP, E2 and the LCA-Strasse working group, we presented a comprehensive life cycle analysis that assesses the environmental footprint of these pavements from production to the end of their service life ("cradle to grave").

Including the use phase: Our analysis showed that low-noise pavements offer significant environmental benefits, particularly in the use phase. The reduction in noise, fuel consumption and tyre wear helps to significantly reduce the environmental impact of these pavements compared to conventional pavements. Conclusion of the analysis: Especially in densely populated areas, the benefits of noise reduction and energy savings clearly outweigh the increased resource requirements of low-noise pavements. This new approach, which includes the utilisation phase and the associated effects in the life cycle analysis, offers a holistic assessment and underlines the ecological and economic relevance of low-noise road surfaces.

Conclusion:

The results of our research emphasise the importance of innovation and sustainable approaches in road construction. Low-noise road surfaces not only offer immediate acoustic benefits, but also contribute to long-term environmental sustainability and improved quality of life in urban areas. Through continuous maintenance and a holistic view of life cycle costs, these surfaces can realise their full benefits.