The aim of the research is to study the effect of operating factors on the pavement and optimize the composition of the modified additive for controlling the structure of concrete. The choice of modifiers for concrete mixtures is mainly made empirically and specifically tied to specific engineering tasks. The specifics of the material work is associated with the unilateral action on the design of the operational load. There are significant gradients of humidity and temperature over the cross section and height of structures. Analysis of the experimental data of the planned experiment made it possible to optimize the composition of the modified additive in order to control the structure to obtain durable concrete.