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  Over a three-year period, the tyre/road noise and the pavement texture were periodically measured on a series of 21 full-scale sites situated in urban areas with a speed limit of 50 km/h. The study involved a wide range of noise-reducing asphalt mixtures, including semi-dense macro rough asphalt AC MR and porous asphalt PA. It has been shown that the acoustic performance decreases asymptotically as a function of traffic volume. For PA the decrease can be delayed provided the pores do not become clogged by dirt. According to the current results, AC MR shows promising acoustic and structural performance. AC MR test stretches may achieve acoustic lifetimes of up to 10 years depending on the traffic volume.
content link: http://www.astra.admin.ch/dienstleistungen/00129/00183/00515/index.html?download=NHzLpZeg7t,lnp6I0NTU042l2Z6ln1ad1IZn4Z2qZpnO2Yuq2Z6gpJCDeHt6fGym162epYbg2c_JjKbNoKSn6A--&lang=en
content language: English
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30.12.2009 Haider, Manfred tyrosafe relevant
This content is related to:
project type
International projects 
area of interest
 noise & vibration
user type
road authorities/owners 
research labs 
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created: Ferenc Rajcsanyi, 15.06.2009 14:43:00
last modified: Ferenc Rajcsanyi, 16.06.2009 09:53:00