COMPLEX MINERAL BINDERS FOR SOIL STRENGTHENING BASED ON SECOND-ARY RESOURCES OF THE CHEMICAL AND METALLURGICAL INDUSTRY

Transportation construction is an important but material-intensive branch of the national economy. For the construc-tion of road base layers, crushed stone from dense rocks and sand and gravel mixtures are mainly used, which are scarce materials. An alternative to natural stone materials are soils reinforced with mineral binders. Portland cement is used as a mineral binder to reinforce soils in transportation construction. It is also allowed to use complex mineral binders with secondary resources for this purpose. In the Urals-Volga region, such secondary resources include wastes of the metallurgi-cal industry - blast furnace and converter slag from Chelyabinsk and Magnitogorsk metallurgical plants. Waste from the chemical industry is also used - mineral product from the soda production of JSC Bashkir Soda Company. On the basis of the above mentioned secondary resources a complex mineral binder was developed, produced by joint grinding of mineral product of soda production after preliminary firing at 950ºC and granulated blast furnace slag of Chelyabinsk Metallurgi-cal Plant. The developed complex mineral binder is characterized by compressive strength of 22-24 MPa at the age of 28 days of normal hardening, i.e. it corresponds to 22,5 N grade according to GOST R 70196-2022 and can be used for strengthening of cohesive and noncohesive soils in the construction of road bases.