Abstract
The use of aggregates with high abrasion resistance is key to guarantee a good track performance during time; however the obtaining of these high-quality aggregates is not always feasible at a reasonable cost. Because of this, the creation of new alternatives with lower life cycle costs and lower environmental impact, such as SFS-Rail, is fundamental for the economic and environmental sustainability of the railway infrastructure. SFS-Rail are recycled aggregates from electric arc furnace slag aimed to be used in subgrade and subballast layers and that offer excellent physical and mechanical properties. In this paper, a worldwide review of the state-of-the-art experiences and legislation in using ferrous slag in railway applications is carried out. Next, the SFS-Rail aggregates are presented as well as their main benefits in terms of track performance and sustainability, based on both laboratory tests and a LCA study. Results from laboratory are compared to existing European norms regulating the use of aggregates in track bed layers to prove their suitability. Finally, the field tests in the Spanish Infrastructure Manager (ADIF) network are described as well as their extensive monitoring equipment to monitor SFS-Rail effect on track performance. Main results and conclusions are drawn.
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