Ferrous quartzite benefication waste as structural component of fine-grained concrete

The article describes problematic situation with waste accumulation from iron ore concentrate production (beneficiation tailings) from ferruginous quartzite at JSC Olkon (Murmansk Region). The task is to utilize beneficiation tailings as a fine-grained concrete component. The paper presents results of beneficiation tailings diagnostics and their testing as a part in the processes of fine-grained concrete structure formation in comparison with quartz sand from the Olenegorsk quarry. According to the research, the replacement of natural sand with beneficiation tailings in their original form leads to a decrease in strength due to insufficient compaction of mixture under adopted vibration compaction modes. At the same time, the use of ground beneficiation tailings in binder composition ensures increase in strength of concrete compared to concrete on "pure" cement and increase of efficiency by using clinker part of binder in formation of concrete strength by 57-58%. The study recommends the use of fine-grained concrete composition of class B40 for production of vibration-pressed urban land improvement products (paving slabs, curbstones, etc.). It reveals prospects for further research in construction and technological utilization of ferruginous quartzite enrichment tailings as a factor in the formation of biosphere-compatible living environment in the region.