This paper discusses the technical feasibility and ecological advantage of using sinter feed tailings from iron ore mining as an aggregate in the production of concrete, initially to manufacture precast concrete pavers, but with the possibility of extending its use to other applications. To achieve this goal, the physical, chemical and environmental characteristics of the tailings were analyzed. The other aggregates used here were also characterized, and the tailings were quality tested when used as fine aggregate in the production of mortars, based on a comparison of their compressive strength. The interlocking concrete pavers were manufactured by a precast concrete plant, after which they were sampled and subjected to compressive strength, water absorption and abrasive wear tests, according to Brazilian technical standards NBR 9780 [33], NBR 12118 [34] and NBR 12042 [35]. The results of these tests indicated that, compared to the reference values, the compressive strength at 28 days varied from -2.5% to -11%; water absorption ranged from -14% to +3.8%; and abrasive wear varied from -80% to -62%. The main purpose of using sinter feed tailings as aggregate in concrete production is to ensure the sustainable development of the construction industry. For the iron ore mining industry, the productive disposal of these tailings represents a major advantage in cost-effectiveness, due to the elimination of stockpiles and of the costs involved in their operationalization.
mining; wastes; sinter feed tailings; paving; interlocking concrete pavers
