In this paper, we discuss the use of a complex nano-modifying additive for concrete. We selected a superplasticizer from nine considered additives by conducting laboratory tests, and therefore propose using the plasticizing additive “Polyplast SP-3” in our work. We present experimental studies on the effect of the complex nano-modifier on concrete strength characteristics, including carbon nanotubes “Taunit-M” and a superplasticizer. The paper discusses two technologies for introducing nano-additives into fine-grained concrete: ultrasonic dispersion and linear induction rotation. We conducted two series of tests on beam samples of fine-grained concrete using these technologies. Based on the obtained experimental data, we revealed a positive effect of adding carbon nanotubes to concrete.It has been found that the use of LIR technology results in a significant increase in strength properties, which is due to the dual effect of activating the components of the mixture and distributing nanotubes through active mixing and vortex action. To investigate the structure of finely-grained concrete with nanoscale additives, we present micrographs obtained using scanning electron microscopy with a Versa 3D microscope. The modified material's structure has a dense particle arrangement, resulting in improved strength characteristics.