Abstract
Abstract In this article, work was carried out to study the chemical, mineralogical composition and toxicological properties of waste (phosphogypsum, phosphorus slags, overburden) of the phosphorus industry, the optimal content of the grain composition of gravel-sand mixtures in the composition of road mixtures (crushed stone, sand-gravel, sand) and structures of the Zhambyl region of the Republic of Kazakhstan. The possibilities of using slag-mineral mixtures in the year - round construction of highways were studied on the basis of a comprehensive study of the physicochemical processes of hardening and the formation of the structure of slag-mineral materials at negative temperatures. Technological regimes for the construction of roads of various technical categories from slag binding materials, reformed after long-term freezing, have been established. New, unparalleled, binding road mixtures have been created to increase the utilization of waste from the phosphorus industry and expand the raw material base of road building materials. The main directions of application of road mixtures based on industrial waste for the purposes of road construction have been developed: construction of structural layers of road pavements; construction of road bed layers.
Highlights
World experience shows that one of the economically and ecologically viable directions for the disposal of industrial waste is their use to obtain various road-building materials [1]–[5]
In Kazakhstan, about 90 % of motor roads with asphalt-concrete pavements have non-rigid bases made of crushed stone, gravel-crushed stone and gravel-sand mixtures of optimal composition
When an unreinforced base is used in a non-rigid road pavement, under the action of heavy dynamic loads from passing vehicles, large stresses arise in the contact zone of individual crushed stones, which often exceed the ultimate strength of the material and cause destruction of crushed stone grains
Summary
World experience shows that one of the economically and ecologically viable directions for the disposal of industrial waste is their use to obtain various road-building materials [1]–[5]. In domestic and foreign practice of road construction, foundations and coatings made of soils and stone materials, reinforced with various slag binders, are increasingly used. Their widespread use is explained by the possibility of obtaining a slab with high deformation properties, good manufacturability and high economic efficiency associated with the economy of scarce stone materials and cement. Phosphorus granular slags, which are a local material and have astringent properties under certain conditions [6], can serve to expand the use of fortified local stone materials in the construction of road pavements in Kazakhstan. Asphalt concrete pavements with slag aggregate are characterized by high strength, abrasion resistance, high coefficient of adhesion, and absence of shear deformations [7]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
