2-3 FUNDAMENTALS OF ENSURING THE REQUIRED PROPERTIES OF FINE-GRAINED CONCRETES: PROBLEMS AND WAYS TO SOLVE THEM

Abstract

The article examines the theoretical foundations for ensuring the required performance properties of fine-grained concrete, as well as the main challenges and possible solutions. It is shown that the development of properties in fine-grained concrete is largely governed by its structural features, in particular high particle packing density and the microstructure of the cement stone. It is noted that the strength characteristics of concrete depend on the size of structural elements, the presence of hydration products, and the distribution of micro-pores.

The regularities of strength development in fine-grained concrete, established in various studies, are analyzed. It is shown that maximum strength is achieved at an optimal density of the concrete mixture, which is ensured by a rational proportion of binder and aggregate. It is concluded that adjustment of the concrete mix composition, in particular the water–cement ratio and component proportions, makes it possible to obtain fine-grained concrete with specified performance characteristics.

Keywords: fine-grained concrete, concrete structure, cement stone, microstructure, particle packing density, concrete strength, water–cement ratio, binder, aggregate, hydration products, porosity, concrete properties.