Conference_programme: 25.2 - Tyre / road noise
Lecture: Effects of sealing on the noise properties of worn pavements
Author(s): Iversen Lykke Møller
Summary:
As a measure to extend the structural life of noise reducing surfaces, the Danish Road Directorate has tried sealing twenty-one different surfaces. The surfaces where: three different 5 years old two-layer porous asphalts, two with max 5 mm and one with max 8 mm aggregate in the top-layer, seventeen 8-10 years old thin layer pavements: two DA 6, three DA 8, two SRS UTLAC, two open AC and eight SMA pavements, and one 20 years old AC.\n\nThese pavements have been studied by Close Proximity (CPX) measurements made with an open measurement trailer before and after the sealing. The two-layer porous asphalts were only measured once after the sealing. The remaining of the pavements has been measured each year for 2-3 years after the sealing.\n\nThe data have been analyzed in order to determine the changes in noise levels before and 6 weeks after the sealing. The initial and the aging effects on the noise properties of the sealed pavements will be studied for all the pavements except the porous asphalt. These were only measured once after the sealing and will only be studied for initial changes. The frequency spectrums will be studied to investigate whether the sealing results in another composition of noise. The study also includes estimates of structural lifetime for the thin-layer pavements before and 3 month after the sealing.\n\nThe noise level after six weeks of traffic on the sealed pavements seems to be slightly lower (0,1 - 0,6 dB) than before the sealing for most of the pavements. Only three pavements of the twenty-one had slightly higher (0,1 – 0,8 dB) noise levels after the sealing were performed. The estimated structural life does not change significantly for the thin layer pavements.\n
Corresponding author
Name: Ms Lykke Møller Iversen
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Denmark
