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During the last decade, the Swedish Transport Administration together with contractors, Steel industry in Sweden and the Swedish National Road and Transport Research Institute have built test road sections with Steel slag in various locations in Sweden. Steel slag has well-known good adhesion, durability, wear resistance and noise reducing properties. This project pointed out the importance for steel slag producers to produce a slag quality that fulfils the requirements as road material, where also particle emission is an important issue. There are over 10 producers of steel slag in Sweden. There are several goals for using steel slag in asphalt mixes; mainly longer technical lifetime caused by good wear resistance against studded tyres, good stability performance in binder and base course, and good durability performance, the latter being especially important in porous asphalt, where it also potentially gives some noise-reducing effects. In addition, the environmental aspects in terms of particle emission, were an important issue for this project. So far, test sections show good performance according to road surface measurements. Laboratory test according to European standards for aggregate and several road simulator test for wear resistance and particle emission have been performed during the last five years by means of the unique road simulator at VTI. An important part of the project is to increase the knowledge for the steel slag producers to develop a material that fulfils the requirements for road material in as many aspects as possible, both technical and environmental issues. The results are so far promising, and expectations are met. |
