ASSESSMENT OF THE EFFICIENCY OF BLAST-FURNACE GRANULAR SLAG AND THE POSSIBILITY OF OBTAINING FROM IT PORTLAND SLAG CEMENT OF TYPE CEM III

The work is devoted to the assessment of the efficiency of blast-furnace granulated slag from the Cherepovets Metallur-gical Plant (CherMK) and the possibility of obtaining slag Portland cement of the CEM III type from it. The chemical and mineralogical composition and physical and technical properties of the CherMK slag have been determined. It has been shown that the slag meets the requirements of GOST 3476-2019 “Blast furnace and granulated electrothermophosphorus slags for cement production” and can therefore be used as an additive for the production of slag Portland cement (type CEM III). The influence of the content of blast furnace slag "CherMK" on the strength activity of slag Portland cement type CEM III was studied. It has been shown that slag in an amount of 15-20% provides the greatest increase in the activity of CEM III, and at 25-30%, grade strength comparable to the strength of Portland cement CEM I 52.5 is achieved. To obtain slag Portland cement of type CEM III/A with a strength class of 32.5 and a water-cement ratio of 0.5, the content of CherMK slag does not exceed 60%.