Self-compacting concrete using pearlite rocks and nanomodifiers

Abstract

The article presents the results of research on composite binders for self-compacting concretes. It is shown that with the introduction of glassy pearlite in an amount of 30%, the maximum increase in physical and mechanical indicators occurs, while with an increase in the content of pearlite to 50-70%, the physical and mechanical indicators are lower than in the control composition. The effect of nanosilica on the compressive strength of composite binders has been studied. The kinetics of heat release during the hydration of cement and composite binders has been investigated. With the introduction of glassy pearlite, a significant change in temperature occurs during hydration. The additional introduction of nanosilica leads to a reduction in the induction period of hydration due to the interaction of nanosilica with the hydration products of cement and composite binders. Compositions of self-compacting concrete with the use of glassy pearlite and nanomodifiers have been developed, and its physical, mechanical and performance characteristics have been determined.