Provvägsförsök på E4 Huskvarna med bullerreducerande asfaltbeläggning

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Torbjörn Jacobson

The report describes a test road with Porous Asphalt (PA) on E4, Huskvarna. Construction contract form of the object was a turnkey contract, including requirements on noise reduction during operation time. In the summer of 2010 two layers of porous asphalt (double layer) were laid at a distance of 2.7 km by Huskvarna. In connection with the performance of the pavement were also a number of test sections into the object. A working group with representatives from contractors (Svevia), suppliers (Nynas), researcher (VTI) and Transport Administration had started up in early 2010 with the aim to develop a concept for double layer of porous asphalt with as good technical and acoustic properties as possible. Past experience showed relatively short lifetimes of these types of pavement and damage related to durability occurred in early stages. VTI has performed noise measurements according to the CPX method (ISO/DIS 11819-2) years 2010, 2011, 2012, 2013 and 2014. The measurements have been performed in all lanes and directions and gave the following results: · 2010: Noise reduction is 7 to 8 dB(A). · 2011: Noise Reduction 7 to 8 dB(A). · 2012: Noise Reduction 6.5 to 7.5 dB(A). · 2013: Noise Reduction 6 to 7 dB(A). · 2014: Noise Reduction 3 to 6 dB(A). The change of 3 dB(A) from 2014 compared with 2013 is connected to the lane K1 where the road was sealed in autumn 2013. The pores may have partially obstructed by the applied adhesive but also by road dirt. The drainability conducted in 2014 also show poorer drainage capacity compared with previous measurements. Drill cores from the road will also be examined for road dirt in the pores.

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