Återvinning av MJOG/MJAG i varmblandad asfalt (halvvarmt i varmt): Malmtransportväg Kaunisvaara – Svappavaara (MaKS)

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The road between Kaunisvaara and Svappavaara in the north of Sweden needs to be upgraded, as an increase of very heavy mining vehicles (90 tonnes) is expected in the future. The route consists mainly of old soft asphalt pavement. The purpose of this study is to evaluate to what extent one can mix these old asphalt pavements as granules in the newly made hot asphalt without impairing the properties of the new pavement. Mixes with 0 per cent (reference), 10 per cent, 20 per cent and 30 per cent granules were selected for evaluation. Asphalt from these four sections have been sent to VTI for analysis. In addition to basic data, such as sieve analyses and binder content, analyses of binder properties of recycled bitumen have been carried out (penetration and softening point). Determination of void content and stiffness modules at +10 °C performed on cores from laboratory compacted slabs. The results show that the material from the different mix with granules is equivalent to the reference mix with respect to stiffness modulus at +10 °C. The study indicates that the technique of mixing the recycled soft asphalt in hot asphalt worked well in amounts up to 30 per cent. The road should be monitored in the future in order to study if differences between test sections will appear over time, with regard to the high volume of the heavy vehicles along this road.

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