MICROCALCITE IN THE COMPOSITION OF FINE-GRAINED CONCRETES ON CEMENTS WITH A NORMALIZED ACTIVITY INDEX AND LOW-ACTIVITY CEMENT

The article presents the results of a study of the effect of microcalcite (finely ground marble) on the properties of fine-grained concrete made on cement with a normalized activity index, as well as the results of the possibility of manufacturing fine-grained concretes, with the introduction of microcalcite, replacing part of the consumption of cement that has lost its activity during long-term storage. It is shown that the use of microcalcite in combination with a superplasticizer can be used as a modifier of concrete strength to increase this indicator or in the manufacture of fine-grained concretes on cements with low activity values without additional activation.