COMPLEX ADDITIVES BASED ON SECONDARY RESOURCES FOR MODIFICATION OF CEMENT COMPOSITES

Abstract

The relevance of the research is caused by the importance of the problem of rational use of natural resources in the production of composite building materials. The ability to replace natural raw materials: limestone, clay, sand in the production of cement binders, concretes and mortars with production waste will significantly reduce the load on the raw material base. A serious environmental problem for mining enterprises is the disposal of stone crushing waste. The use of inorganic wastes of various chemical composition makes it possible to control the processes of structure formation and hardening of filled cement systems and to obtain composite materials with high physical and mechanical properties. The main aim is to scientifically substantiate and explore the possibility of using waste from mining enterprises as a component for the production of modifying additives in cement systems. Objects: modified cement stone; modified cement-sand mortars. Methods: determination of the mobility of mixtures, flexural and compressive strength according to SS; thermal analysis; electron microscopiy. Results. The paper introduces the results of studies on the effect of adding microcalcite from different deposits on the properties of cement systems. It is shown that the addition of microcalcite (MCa) additive from the Dalnegorsk mining quarry increases the compressive strength of cement stone on the first day by 16 %, but on days 3 and 7, the strength of the modified samples decreases relative to the control samples. The introduction of the MCa additive of the Novo-Ivanovsky quarry, near the town of Polevskoy, Everest LLC in the amount of 5 % by weight of cement significantly increases the compressive strength of the cement stone, promotes the formation of an additional amount of low-basic calcium hydrosilicates, stable high-basic calcium hydroaluminates with an overgrown needle-like structure, tightening pores.

Keywords

• binder
• cement compositions
• microcalcite
• modifying additive
• secondary resources