On the properties of nano-modified cement stones

On the properties of nano-modified cement stones

Автор: Vakhitova R.I., Saracheva D.A., Mazankina D.V., Kiyamov I.K., Sabitov L.S.

Журнал: Nanotechnologies in Construction: A Scientific Internet-Journal @nanobuild-en

Рубрика: Study of properties of nanomaterials

Статья в выпуске: 5 Vol.11, 2019 года.

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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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Heavy concrete, hyperplasticizer, water repellent, nano-modified cement stone, nanomaterials, TUBALL, single-layer and multi-layered carbon nanotubes, hardening, curing, dispersion

Короткий адрес: https://sciup.org/142227464

IDR: 142227464   |   DOI: 10.15828/2075-8545-2019-11-5-565-576

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