Аннотация
Nowadays ensuring normal operation of buildings made of monolithic reinforced concrete is of great relevance. Bearing building structures in the process of operation or erection can have defects and damages of various origins. There is a need to develop repair compositions to ensure the durability and reliability of monolithic reinforced concrete buildings. In this paper we have conducted research and developed a repair composition of fine-grained concrete (FGC) on the basis of modification and improvement of its structure. In the composition of complex modifier on the basis of analysis were chosen: microsilica MCU-95 as a highly active pozzolanic mineral admixture; superplasticizer C-3, hydrophobizing component – soapstock. Cements of Novo-Karaganda, Ust-Kamenogorsk, Shymkent cement plants M400 were chosen as binders. In order to study the influence of modifiers on the setting time of cement dough and concrete structure, several concrete compositions were developed. The performance of the developed FGC was improved in terms of basic physical and mechanical parameters. Cement consumption was reduced by 15% (from 450 kg to 382.5 kg). The influence of the main factors and dependence of performance indicators on physical and mechanical properties of cement stone and the studied FGC has been established. Production waste and local construction materials were used to save binder.