Use of resource potential of waste for asphalt concrete production

Abstract

One of the possible ways to reduce the consumption of natural resources is to use the resource potential of industrial waste for the production of building materials. Using the resource potential of waste, it is possible to obtain additional positive effects in the form of a reduction in the cost of the product obtained, a decrease in the technogenic load on the environment at the waste disposal sites, and the production of a product with higher physical and mechanical characteristics. Waste foundry sand was considered as such an industrial waste. Preliminary studies of the physical and chemical properties of used foundry sand have shown that it can be effectively used in asphalt concrete. For the study, the compositions of asphalt concrete on natural, quartz and waste molding sand were used. In the course of the study, it was found that the spent molding sand, having a well-developed, rough surface, makes it possible to obtain asphalt concrete with high physical and mechanical characteristics. Strength limits of asphalt concrete samples at temperatures of 50 ° C and 20 ° C, water resistance showed a significant increase in their values. The proposed technology for recycling waste from the steel industry makes it possible to effectively use the material resource of the spent molding sand, to reduce the volume of its accumulation.