Application of fine waste from iron ore beneficiation in reinforced concrete structures with basalt-plastic reinforcement

Abstract One of the main development programs of each country is the control and utilization of industrial waste since the sustainable development of this industry is accompanied by the greatest environmental pollution. Iron ore beneficiation byproducts are artificial quartz-iron mineral mixtures that are fed into sludge ponds that form the so-called tailings ponds in the form of pulp. Tailings ponds occupy more and more territory every year and have a significant negative impact on the environment. At the same time, industrial waste from iron ore enrichment, the so-called tailings, is used as a fine aggregate in concrete mixtures to replace quartz and construction sand. Studies show that a 40% replacement of quartz sand with fine iron ore dressing waste is optimal for the manufacture of concrete mixtures without any adverse effect on strength and durability properties. The paper considers the stress-strain state of beams in the second group of limit states made of concrete mixtures at 100% replacement of quartz sand with fine plant protection products waste. The percentage of reinforcement of beam sections of all series and the class of concrete were assumed to be the same for samples of all series. The results of experimental tests showed almost comparable results of crack resistance of beams reinforced with metal reinforcement and with hybrid reinforcement. At a load of 70% of the destructive capacity, BM and BMD beams do not exceed the maximum permissible width of normal crack opening, and BMBD beams do not exceed the maximum permissible width of 60%.