Review article

Reducing the consumption of binders in concretes isan important task and is achieved by choosing the optimalgranulometric composition of the aggregate, adding activemineral additives, fillers, using superplasticizers andeffective compaction methods. In the building materialsindustry, products on gypsum and gypsum-containingbinders with their high technology are produced withoutfillers, which leads to a significant increase in the cost offinished products. The paper presents the results of thestudy of the effect of the composition of fractionatedsands on the physical and mechanical properties ofconcrete based on gypsum-cement-pozzolan binder.Using the constructed mathematical models, optimizationproblems were formulated and solved to determine thefractional compositions of sands that provide the bestvalues of physical and mechanical properties of concrete,such as density and compressive strength. he obtainedmodels for optimizing the physical and mechanical propertiesof concrete depending on the fractional composition of theaggregate, which used sand of six different fractions, suggest thatit is possible to achieve the strength of this concrete on the 7thday of normal moisture hardening of 66 MPa with an averagedensity of 2278 kg/m3 with a packed density of fine aggregateof 1665 kg/m3 and a minimum void volume of 36.4 %.