Energisnåla beläggningar: uppföljning av riksväg 95 objekt Varuträsk − Boliden

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In this project the functional properties are evaluated for two different sections along highway 95 between Varuträsk and Boliden in Västerbotten county. Both sections are approximately 100 m long and constructed in the same way, except for the base layer. The base layer is bituminous and is made using cold manufacturing for the test section and this construction is compared to a reference section constructed using a conventional hot mix base layer. The functional properties of the two constructions are evaluated using different methods such as falling weight deflectometer, strain gauges and core samples.

The evaluations show that the test section with cold asphalt has lower stiffness and is exposed to higher strains compared to the reference section. The growth of rut depth and unevenness in the longitudinal direction of the road is considered to be at a normal level and the difference between the two sections are insignificant. Also, the laboratory tests indicate a clear difference for both the stiffness modulus and fatigue where the reference section shows superior properties. In the laboratory testing it was also noticed that the binder content was clearly lower than what was specified in the recipe which could possibly partly explain the inferior results.

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