<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Longitudinal variability in tyre/road noise is often associated with low-noise porous asphalt surfaces, with CPX testing results for individual 20-metre road segments commonly varying by up to 6 dB along new projects in New Zealand. In November 2018, following on from previous trials investigating the effects of air voids and stone size, three EPA7 trial sections were constructed to investigate the effects of layer thickness on tyre/road noise. The thickness effect was found to be approximately –2 dB L<sub>CPX:P1,80</sub> per 10 mm increase in target layer thickness across the three trial sections. Core samples taken from a new road showed EPA7 layer thicknesses that differed from the target layer thickness by up to 15 mm. These findings suggest that variations in layer thickness may be a key contributor to longitudinal variations in tyre/road noise on roading projects using porous asphalt. A further investigation involving a detailed thickness survey is currently underway to better understand layer thickness variability and its effect on tyre/road noise.</p>
</abstract>

Longitudinal variability in tyre/road noise is often associated with low-noise porous asphalt surfaces, with CPX testing results for individual 20-metre road segments commonly varying by up to 6 dB along new projects in New Zealand. In November 2018, following on from previous trials investigating the effects of air voids and stone size, three EPA7 trial sections were constructed to investigate the effects of layer thickness on tyre/road noise. The thickness effect was found to be approximately –2 dB LCPX:P1,80 per 10 mm increase in target layer thickness across the three trial sections. Core samples taken from a new road showed EPA7 layer thicknesses that differed from the target layer thickness by up to 15 mm. These findings suggest that variations in layer thickness may be a key contributor to longitudinal variations in tyre/road noise on roading projects using porous asphalt. A further investigation involving a detailed thickness survey is currently underway to better understand layer thickness variability and its effect on tyre/road noise.

Investigating the effect of layer thickness on the variability of porous asphalt tyre/road noise

Romanian Journal of Transport Infrastructure

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Longitudinal variability in tyre/road noise is often associated with low-noise porous asphalt surfaces, with CPX testing results for individual 20-metre road...

Investigating the effect of layer thickness on the variability of porous asphalt tyre/road noise

Published Online: Aug 23, 2022

Page range: 1 - 15

DOI: https://doi.org/10.2478/rjti-2022-0001

Keywords
tyre/road noise, CPX trailer, low-noise road surface, porous asphalt

© 2022 John Bull et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Investigating the effect of layer thickness on the variability of porous asphalt tyre/road noise

Published Online: Aug 23, 2022

Page range: 1 - 15

DOI: https://doi.org/10.2478/rjti-2022-0001

Keywordstyre/road noise, CPX trailer, low-noise road surface, porous asphalt

© 2022 John Bull et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
tyre/road noise, CPX trailer, low-noise road surface, porous asphalt