The nanotechnologies applied in engineering will increase its energy efficiency. The use of nanomaterials will make it possible to reduce costs. Currently, the search for nanomodified materials is relevant for the construction industry. Various carboncontaining structures are used as nanodispersed modifiers. Taunit has been selected as carbon nanomaterial. This nanomaterial is packaged multilayer nanotubes with a conical shape of graphene layers.To conduct this research samples of foam concrete cements have been studied. To improve the mechanical properties of the cement stone, elongated nanoparticles with high strength were used. They reinforce cement mortar, at the same time being the centers of crystallization and increase the strength of the nanomaterial.In the course of experiments, carbon nanotubes «Taunit» were added to the foam concrete in the amount of 0.005-0,0005% by weight of cement. In the manufacture of nanomodified foam concrete it is important to ensure uniform distribution of nanoparticles. The studied cement stone chips were sprayed with Au / Pd alloy in a Quorum 150T ES vacuum unit in a 80/20 ratio. The microstructure of solid samples of cement material was investigated by means of a high-resolution auto-emission electron microscope Merlin of CARL ZEISS.When multi-layered carbon nanotubes of "Taunit" brand were introduced into the cement mortar, the relief microstructure of the cement was characterized by a heterogeneous and loose structure. In the course of testing the strength of the investigated samples, the following results were obtained: under bending loads applied to cement-sand mortar for 7 days, hardening increased by 35%, and after 28 days -by 30%; under compressive loads, the increase in strength is 42% and 22%, respectively, relative to the original composition without the addition of nanomodified materials.The addition of nanodispersed modifiers to the cement stone made it possible to increase the strength of concrete and foam concrete. Based on the obtained nanomodified foam concrete, a device for insulating pipelines has been proposed. Machine-readable information on CC-licenses (HTML-code) in metadata of the paper
The use of nanotechnology in the construction industry improves its efficiency. The application of nano-modified materials makes it possible to reduce capital costs. Currently the introduction of nanomaterials is of great importance for the construction industry. Carbonaceous structures can be used as nano-modifiers. Carbon nanotubular material TUBALL produced by OCSiAl.ru LLC has been chosen.To perform research samples of single-layer and multi-walled carbon nanotubes were used as a part of cement heavy concrete. The optimal dosage of carbon nanotubes in the composition of cement concrete has been experimentally determined. The studies revealed that addition of TUBALL carbon nanotubes to the cement composition contributed to the formation of a mesh structure that resists the formation of shrinkable nanoscale cracks in the cement mortar, promotes the appearance of calcium hydrosilicates, increases the concentration of calcium ions at the start of the hydration period.The influence of modified nanoadditives in the composition of the complex additive on the mechanical properties of the cement composition has been considered. The complex of mechanical properties of cement nanoreinforced stone in the process of cementing the annular space of producing wells by X-ray and thermal methods of analysis has been studied. That confirmed the results of experiments performed with electronic and optical microscopy.The microstructural elements of the cement specimen were investigated with high-resolution auto-emission scanning electron microscope Merlin by CARL ZEISS.It was found that the addition of complex nanomodified additive TUBALL accelerates the curing of the cement composite at early stage of hardening, decreases value of shrinkable nano-cracks, that in turn positively characterizes the quality of contacts at the boundaries of cement-casing, rock-cement.
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