Investigation of Some Properties of Working Suspensions based on a Fine-dispersed Binder

摘要

This article considers the issues of the application of fine-dispersed mineral powders, which, in general, are used as active mineral additives or inert fillers for binders. It is known that the presence of such fine particles in the binder provides its denser packaging, increases the degree of constraint of the water-cement paste and the resistance to segregation, and in case of combination with the super- or hyperplasticizer its increases fluidity of the mixture. It is shown that fine-dispersed additives with hydraulic activity and developed specific surface, in addition, accelerate hardening and increase the strength of paste matrix and concrete. The possibility of using aqueous suspensions of particularly finely dispersed binders for impregnating loose or low-strength porous structures to increase the operational physical and mechanical loads was investigated. Also, the efficiency of using water-base cement suspensions of particularly fine-dispersed binders to impregnate loose or low-strength porous structures to increase the operational physical and mechanical loads. In the article we are presented results of the investigation of the physical and mechanical characteristics of working suspensions based on a fine binder used for injection solutions for the restoration of concrete and reinforced concrete structures, as well as for fixing soils, hydraulic engineering and underground structures, and the introduction of mineral additives into. Also, method of determining the viscosity and sedimentation (water segregation) of working suspensions, as well as their strength characteristics. Based on the results of the experimental investigation, optimal dosages of additives were chosen in order to reduce the binder's consumption and increase the characteristics of working suspensions based on a finely dispersed binder.