Improving the properties of mobile sands with modified connectors based on local raw materials

Abstract

In this article, studies have been conducted to reduce the overflight of sand by roads and railways in desert areas, and to increase the resistance of the sand surface to deflation, wind and water erosion. In order to improve the balance of the transport infrastructure and increase the dynamics of activity, some binders have been obtained. The resulting binder (HYPANE) based on hydrolyzed polyacrylonitrile is produced by Navoiazot JSC, and SKM-1 based on phosphogypsum waste is produced by Maxam-Ammophos JSC and SKM-2 based on phosphorized lignosulfonate. A polymer binder additive was sprayed onto the sand surface in different concentrations and the wind resistance of the resulting protective layer on the sand surface in a wind tunnel proposed by Froude was investigated. The established experiments revealed the maximum value of the required plastic strength (Р_m ≥ 2.5‒2.7 kPa) of the protective coating, the consumption of hardening polymer solutions to achieve this strength (l/m2 ). The optimal consumption of the binder SKM1 is 4 l/m² . For the binder SKM-2, it was 2‒3 l/m² , and for the HYPANE solution 5 l/m2 . Due to changes in the humidity of the synthesized binders on the surface of the sand, the process of absorption and hydration of the binders SKM-1 and SKM-2 in the sand-water system occurs. Thus, a durable material has been obtained, which has a positive effect on the formation of a dense protective layer on the sand surface.