Optimization of the composition and technological processes of dispersed cement systems with high performance properties

Abstract

The technological parameters of obtaining cement disperse systems are considered. It is shown that the optimization of technological processes allows the development of dis-persed cement systems with high protective resistance during the operation of buildings and structures. It was determined that optimization of the parameters makes it possible to select the most effective ratio of cement and finely ground filler from concrete scrap, the optimal amount of modifier additives, and then the ratio of colloidal cement glue and sand (aggregate) in order to obtain mortar compositions for decorative coatings with high strength properties. It was found that grinding sand or crushed concrete scrap allows not only to increase their specific surface and obtain the required particle size distribution, but also to improve the surface quality of particles by removing and destroying surface inactive films, which increases the reactivity of the filler in various processes. Mechanical activation in combination with modifying additives allows to give the necessary properties to colloidal cement composites using optimal techno-logical parameters of processing. The influence of the particle size distribution of sand on the strength characteristics of decorative coatings based on colloidal cement glue is determined de-pends on the ratio of colloidal cement binder to sand. Studies have shown that the fractional characteristics of sand are optimal, in which dense packing of grains and approximately equal fractions of fractions are ensured. It has been established that dispersed cement systems with an optimal fractional composition of the filler have a water-holding capacity that significantly ex-ceeds the standard values.