Slaggasfalt, delrapport B: stabilitet och skjuvegenskaper hos slaggasfalt

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Slag as aggregate in asphalt mixes has previously been studied both in the laboratory and through different road tests. Primarily, these studies have meant wearing courses because it has been found that many slags is highly abrasion resistant and has also shown positive characteristics as aggregate in noise-reduction pavements. In this project is the study focused on stability characteristics of binder and base mixes. Drilled cores from three road objects have been studied, where the slag asphalt is exposed to very heavy traffic at the entrance of two different steel industries and one object where the slag asphalt is located in a roundabout. These pavements are 10-15 years old. In addition to these test binder course of the type AC16 with 70/100 bitumen has been produced in the laboratory with slag from 10 different steel producers and one reference with conventional aggregate. The analysis carried out is dynamic creep according to FAS Method 468 and shear strength according to method developed at VTI. The shear strength was investigated at different temperatures and frequencies (load speeds), which make it possible to present the results in so-called master curves. The advantage of this type of complex research is to assess the function of the pavement at different seasons and different traffic speed. The results from both cores and laboratory samples has shown that asphalt mixes with slag as aggregate provides stable pavements that are suitable on particularly sensitive surfaces such as roundabouts, traffic lights and bus stops, which have large shear stresses.

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