Modification of fine-grained concrete with carbon nanotubes

The article considers the possibility of using nanotechnology in the production of concrete. Special attention is paid to the method of administration of nano-sized additives, due to their low concentration in the composition of concrete, as well as their tendency to form aggregates. Experimental data on the selection of a type of plasticizing additive to obtain optimum plastic properties of a concrete mix are presented. Thus, on the basis of the experimental data, the plasticizer SP-3 was selected, which allowed to reduce the water-cement ratio from 0.48 to 0.36 without losing the plasticity of the mixture. Data on the development of the composition of nanomodified fine-grained concrete by introducing Taunit-M carbon nanotubes in the amount of 0.01–0.001 % by weight of the binder are also presented. Two methods of introducing carbon nanotubes are considered, namely the technology of ultrasonic dispersion and the use of a vortex layer apparatus. The possibility of combining the two technologies to introduce a complex additive into concrete is considered. The greatest increase in strength (up to 26 %) was achieved when nanotubes were introduced into the mix using a linear induction rotator together with the introduction of a plasticizer into the water using an ultrasonic disperser.