Thin asphalt layers for highways - optimised for low tyre/road noise

Thin asphalt layers for highways - optimised for low tyre/road noise

The Danish Road Directorate / Danish Road Institute (DRI) has been cooperating with the Dutch Road and Hydraulic Engineering Institute (DWW) in the DRI-DWW noise abatement programme as a part of the Dutch IPG programme.Focussing on highway application thin asphalt surface layers have been optimised for low tyre/road noise and followed over a couple of years.Two test sites have been established: a heavily trafficked motorway near Copenhagen (M10) where 6 different thin layers were constructed in 2004, and a highway near Herning (M64) where eleven test sections were constructed in 2006.The purpose of the experiments was to document the noise at each test surface and to examine possible ageing effects on the noise reduction.The noise measurements have been supplemented by measurements of surface profiles as well as friction.Noise measurements were carried out both as statistical pass-by measurements (SPB) and as close proximity (near field) measurements (CPX) according to ISO 11819.At both test sites a reference surface of the same age and traffic load was constructed as a dense asphalt concrete surface with 11 mm maximum aggregate size.At the first test site an initial range of variation of SPB noise results was almost 3 dB between the quietest and the noisiest pavement for passenger cars.For trucks a range of variation from 2 - 2.5 dB was found. During the first two years the noise levels increased slightly, and the noise reduction decreased to 0 - 1 dB for cars, but was unchanged for trucks. At the second test site (M64) the initial noise reduction was 1 - 2 dB better than at M10.The most promising concepts for low noise thin asphalts layers seem to be open graded asphalt concrete (AC 6o / AC 8o), optimized stone mastic as-phalt (SMA 6+ / SMA 8), but also thin semi porous asphalt layers (BBTM 6 Cl.2) may be developed further.The changes of the noise levels have been compared to changes in surface texture (including texture spectra) but this comparison did not show any systematic relationship. The friction was for all test pavements with maximum aggregate size 6 - 8 mm better than the friction for the reference DAC 11 pavement.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9788792094421
• Authors:
  • ANDERSEN, B
  • BENDTSEN, H
• Publication Date: 2008

Language

• English

Media Info

• Pagination: 22
• Serial:
  • THIN ASPHALT LAYERS FOR HIGHWAYS - OPTIMISED FOR LOW TYRE/ROAD NOISE
  • Issue Number: 160
  • Publisher: Danish Road Directorate

Subject/Index Terms

• TRT Terms: Friction; General surface features of the earth; Geomorphology; Measurement; Noise; Research projects; Skid resistance; Sound level; Wearing course (Pavements)
• Geographic Terms: Denmark
• ITRD Terms: 8028: Denmark; 4076: Fabric (geomorphol); 5452: Friction; 6136: Measurement; 2492: Noise; 8557: Research project; 6747: Sound level; 4076: Texture (geomorphol); thin asphalt; 2980: Wearing course
• Subject Areas: Environment; Highways; Research; I15: Environment; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 01335980
• Record Type: Publication
• Source Agency: Danish Road Directorate
• ISBN: 978-87-92094-42-1
• Files: ITRD, ATRI
• Created Date: Apr 15 2011 2:04PM