Use of the Waste Foundry Sand in the Composition of Hot Sandy Dense Asphalt Concrete
There is an increase in motorization worldwide, which in turn requires the construction of high-quality roads and highways. In both new construction and reconstruction of the pavement, large volumes of natural mineral materials are used, placing a large technogenic load on environmental objects during their extraction. In a number of regions of the Russian Federation, there are not sufficient volumes of conditioned raw materials for the production of high-quality composite building materials, such as asphalt concrete and cement concrete mixtures. The use of industrial waste in the composition of building materials addresses this issue while both solving environmental issues and reducing the cost of road construction. This article shows that developed countries successfully use the resource potential of waste in the production of building materials. This article proposes the use of waste foundry sand as the mineral raw material in the production of asphalt concrete. The article presents research on the following: geometric shape, elemental composition of the surface of the particles of the waste foundry sand; bitumen capacity; and the adhesion of bitumen. Based on the obtained data, a technology was developed for producing hot sandy asphalt concrete in which the waste foundry sand is used as a fine mineral aggregate. Physico-mechanical properties of the obtained samples of asphalt concrete satisfy the requirements established in GOST for asphalt concrete.
Keywords: waste foundry sand, asphalt concrete, industrial material, elemental composition, bitumen
 Iqbal, M. F., Liu, Q. F. and Azim, I. (2019). Experimental Study on the Utilization of Waste Foundry Sand as Embankment and Structural Fill in Materials Science and Engineering. Sci. Eng., vol. 474, pp.12-42.
 Gurumoorthy, N. and Arunachalam, K. (2019). Durability Studies on Concrete Containing Treated Used Foundry Sand. Construction and Building Materials, vol. 201, pp. 651-661.
 Sarumathi, K., Elavenil, S. and Vinoth, A. S. (2019). Use of Waste Foundry Sand with Multiscale Modeling in Concrete. Asian Journal of Civil Engineering, vol. 20, pp. 163-170.
 Martins, M. A. D. B., et al. (2019). Study on Waste Foundry Exhaust Sand, WFES, as a Partial Substitute of Fine Aggregates in Conventional Concrete. Sustainable Cities and Society, vol. 45, pp. 187-196.
 Dyer, P. P. O. L., et al. (2018). Environmental Characterization of Foundry Waste Sand (WFS) in Hot Mix Asphalt (HMA) Mixtures. Construction and Building Materials, vol. 171, pp. 474-484.
 Pasetto, M. and Baldo, N. (2015). Experimental Analysis of Hydraulically Bound Mixtures Made with Waste Foundry Sand and Steel Slag. Materials and Structures, vol. 48, pp. 2489-2503.
 Vázquez-Rodriguez,F.J.,etal.(2018).NonferrousWasteFoundrySandandMillingFlyAshasAlternative Low Mechanical Strength Materials for Construction Industry: Effect on Mortars at Early Ages. Revista Romana de Materiale. Romanian Journal of Materials, vol. 48, issue 3 pp. 338-345.
 Torres, A., Bartlett, L. and Pilgrim, C. (2017). Effect of Foundry Waste on the Mechanical Properties of Portland Cement Concrete. Construction and Building Materials, vol. 135, pp. 674-681.
 Tyuryukhanov, K. Y. and Pugin, K. G. (2018). Features of the Interaction of Bitumen with Spent Molding Sand. Presented at The Role of the Reference University in the Development of the Transport and Energy Complex of the Saratov Region. Saratov. Russia. pp. 414-416.
 Pugin, K. G., Agapitov, D. A. and Tyuryukhanov, K. Y. (2017). The Study of the Particle Size Distribution of Waste Foundry Sand. Presented at Design Methods and Optimization of Technological Processes. Ufa. Russia. pp. 45-47.
 Inozemtsev, S. S. and Korolev, E. V. (2014). The Choice of Mineral Carrier Nano-Sized Additives for Asphalt Concrete. Bulletin of MGSU, vol. 3, pp. 158-167.
 Yadykina, V. V. and Trautvain, A. I. (2015). The Effect of the Activity of Fillers From Technogenic Silica- Containing Raw Materials on The Strength of Cement Systems. Basic research, vol. 5, issue 1, pp. 174-179.
 Kochnev, V. I. and Kotlyarsky, E. V. (2015). Technological Properties of Asphalt Mixtures. Industrial and Civil Engineering, vol. 12, pp. 14-18.