Slaggasfalt, delrapport A: ballastegenskaper och slitageegenskaper enligt Prall

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There is great interest in the steel industry to increase the use of slag by constantly seeking new application opportunities. This project has focused on slag used as aggregate in asphalt pavement, where the most positive characteristics are the good adhesion and noise reduction properties, as well as good stability and durability. One aim of the project is to make the slag asphalt to a natural choice on roads in urban areas, where it is complicated because of congestion to do maintenance work and where high strength e.g. roundabouts, traffic lights, et cetera. Therefore, one wishes, and where noise and particle formation due to traffic is a problem. A second objective is to increase the material economy of society by using slag, produced in conjunction with steel instead of other materials whose properties often results in asphalt with poorer performance than Slag Asphalt. In this first interim report, results of about 10 different slag types are summarized, with respect to: 1. ballast properties, 2. wear properties according to Prall (EN 12697-16, Method A). By improving the process technology and manage the slag material with regards to crushing, magnetic separation and sorting etc. of the slag producer, the quality become better and smoother and materials become valued for road construction. Slag materials were sent to VTI from each supplier. VTI performed all testing. Aggregates Testing of the various slag materials have been performed according to European standards for different properties like abrasion resistance, fragmentation and shape: · EN 1097-1 resistance to wear (micro-Deval). · EN 1097-2 resistance to fragmentation (Los Angeles Value), · EN 1097-9 resistance to abrasion of studded tires (Nordic Ball mill), · EN 933-3 particle shape – Flakiness index. For Prall tests, asphalt specimens of type ABS11 (asphalt wearing course), where made. The fine fraction (0-4 mm) consisted of granite materials and all materials >4 mm consisted of the respective slag material. 9 out of 10 slag types investigated are REACH registered products.

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