The importance of the bottom layer in double-layer porous asphalt for noise reduction

Ulf Sandberg; Piotr Mioduszewski

doi:10.1121/1.4708027

The importance of the bottom layer in double-layer porous asphalt for noise reduction

Abstract

Double-layer porous asphalt concrete (DPAC) surfaces are generally considered to be the acoustically most effective low noise road surfaces ready for implementation. While DPAC used on highways in warm climates may have an average life of around 8 years, in Scandinavia with severe winter climate DPAC usually survive only about 3 years; partly due to wear of studded tyres. An ongoing project in Sweden, applying DPAC and single-layer porous asphalt (PAC), the latter consisting of the top layer of the DPAC, on motorway E4 in Jönköping-Huskvarna, has revealed interesting performance. Initial noise reduction was 7.5 dB(A) compared to a set of reference surfaces (conventional SMA 0/16). Amazingly, after one year of operation this noise reduction is unchanged. Most interesting is that the noise reduction difference between the single-layer and double-layer PAC is approx. 5 dB(A). Since the single-layer PAC is identical to the 30 mm thick top layer in the DPAC (although 5-8 mm thicker), it follows that 2/3 of the noise reduction is due to the bottom layer of the DPAC; i.e. what lies approx. 35-40 mm below the top surface. The paper will discuss the effect of the bottom layer on the overall acoustical efficiency of the DPAC.

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Authors (2)

Ulf Sandberg
- Swedish National Road and Transport Research Institute VTI
Piotr Mioduszewski dr hab. inż.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: Journal of the Acoustical Society of America no. 131, edition 4, pages 1 - 6,
ISSN: 0001-4966
Language:: English
Publication year:: 2012
Bibliographic description:: Sandberg U., Mioduszewski P.: The importance of the bottom layer in double-layer porous asphalt for noise reduction// Journal of the Acoustical Society of America. -Vol. 131, iss. 4 (2012), s.1-6
DOI:: Digital Object Identifier (open in new tab) 10.1121/1.4708027
Verified by:: Gdańsk University of Technology