STUDY ON THE POSSIBILITY OF OBTAINING LOW-WATER-DEMAND CEMENTS BASED ON INDUSTRIAL WASTE FROM THE REPUBLIC OF KAZAKHSTAN

The article presents the results of research on the production of low-water-demand cements (LWDC) using raw materials from the Republic of Kazakhstan: conditioned and unconditioned clinker from LLP "Bukhtarma Cement Company," fly ash and slag waste from the Ust-Kamenogorsk CHP plant, and granulated blast furnace slags from the Ust-Kamenogorsk and Karaganda metallurgical plants. LWDC was produced by jointly grinding cement clinker, gypsum stone, industrial waste, and a polycarbox-ylate-based superplasticizer to a specific surface area of 450–550 m²/kg in a vibratory mill. The choice of industrial waste of various compositions as fillers for LWDC production is substantiated, demonstrating that their use allows for the utilization of large-tonnage industrial waste while obtaining binders with strength comparable to that of industrial cement. Physical and me-chanical indicators of LWDC were found to depend on the filler amount, fineness of binder grinding, and superplasticizer con-sumption. Fine grinding of components in the presence of a dry superplasticizer made it possible to produce LWDC 70 and LWDC 50 with compressive strengths of 50–70 MPa.The research demonstrated the possibility of using unconditioned clinker, which is formed at the cement plant as a result of technological process violations and is either stockpiled or partially added to the cement grinding mill, thereby deteriorating its quality, for LWDC production. The optimal ratio of conditioned and uncondi-tioned clinker was established. It was shown that up to 35% of unconditioned clinker can be used in LWDC composition, produc-ing low-water-demand cements with compressive strengths of 45–55 MPa.