TY JOUR TI PROBLEMS AND PROSPECTS OF USING ALUMINATE CEMENTS FOR THE PRODUCTION OF UNFORMED REFRACTORIES KW high-alumina cement KW calcium aluminozirconate KW calcium zirconate KW hydration KW calcium hydroaluminates KW structure of cement stone. JO Technique and technology of silicates AU Krivoborodova, S.Y. AU Korshunov, A.V. PY 2025 IS PB Individual Entrepreneur Svetlana Vasilievna Samchenko