Abstract

In order to ensure a clean “climate”, environmental safety in the areas of thermal power plants and metallurgical production by involving large-scale disposal of their waste in the production of cement, the chemical and mineralogical compositions and physical and chemical properties of ash and slag mixtures of the Angren TPP and waste from the steelmaking production of Uzmetkombinat JSC - microsilica were determined, recycled steel, furnace, ladle slag. Their hydraulic activity was established according to the Student’s criterion in order to determine their possibility as ingredients of “green” hybrid additives for the production of composite Portland cements and conclusion was issued on their compliance with the requirements of O’z DSt 901-2020 for additives suitable for use in the cement industry. With different combinations and ratios of Portland cement clinker, natural gypsum stone and new types of hybrid additives, composite Portland cements were prepared and comparative tests were carried out to determine their physical and mechanical properties. Based on the results of the strength indicators of “green” composites, the compositions of new types of composite Portland cements were optimized, which meet the requirements of the Standard of the Republic of Uzbekistan O‘z DSt 2830:2014 “Portland cement with composite additives. Specifications” for Portland cement grades 400-450.

Keywords: Clinker; Man-made waste; Dry ash and slag mixture; Silica fume; Recycled steel slag; Furnace slag; Ladle slag; Recycling; Composite additive in cement; “Green” cement composite; Clinker saving