Noise-reducing double-layer porous pavement with steel slag aggregate

Projekt:

Lågbullerbeläggning med stålslagg på E4 i Huskvarna

Sammanfattning:
This paper presents results of a trial replacing the natural aggregate in the top layer of a double-layer porous asphalt pavement with steel slag. An almost 200 m long motorway section was paved with this material, on the same road and lane as a comparable conventional pavement. Performance in terms of macrotexture and noise properties are monitored for an entire life-cycle of 7 years.

The results in terms of noise reduction compared to the common Swedish reference pavement (SMA 16) indiciet an initial noise reduction of about 7 dB; similar to the same pavement with natural aggregate. After 5-7 years of service its noise reduction is similar to or marginally better than the conventional double-layer asphalt pavement. This is surprising since the steel slag pavement appears to clog a little faster than the conventional. Probably, there are (unknown) properties in the slag material which balances out the clogging effect.

At present this pavement has reached an age of 7 years with still satisfactory overall performance, which is comparable to conventional double-layer porous pavements serving the same road. Consequently, recycling steel slag in such paving applications is a win-win situation.

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Författare: Ulf Sandberg
Utgivare: VTI
Utgivningsdatum: 2024
Diarienummer: TRV 2015/56557
Antal sidor: 12
Språk: Engelska
Kontaktperson: Erik Oscarsson, IVtu2 och Robert Karlsson, IVtu4