Pages: 31-44
Effect of surface treatment of carbon nanotubes on mechanical properties of cement composite
Authors: KONDAKOV Alexander Igorevich, Graduate student, Tambov State Technical University; Sovetskaya Str., 106, Tambov, Russia, 392000, bdiyoz@mail.ru;
MIKHALEVA Zoya Alekseevna, Ph.D. in Engineering, Associate Professor of the Department
«Technique and Technology of Nanoproducts Manufacture», Tambov State Technical University; Sovetskaya Str., 106, Tambov, Russia, 392000, zoyamih3@gmail.com;
TKACHEV Alexey Grigorievich, Doctor of Engineering, Professor, Head of the Department
«Technique and Technology of Nanoproducts Manufacture», Tambov State Technical University; Sovetskaya Str., 106, Tambov, Russia, 392000, postmaster@kma.tstu.ru;
POPOV Andrey Ivanovich, Ph.D. in Pedagogics, Associate Professor of the Department «Technique and Technology of Nanoproducts Manufacture», Tambov State Technical University; Sovetskaya Str., 106, Tambov, Russia, 392000, olimp_popov@mail.ru;
GORSKI Sergey Yurevich, Master in Engineering and Technology, Graduate student, Tambov State Technical University; Sovetskaya Str., 106, Tambov, Russia, 392000, eshik_88@mail.ru
Extended Abstract:The aim of the paper is to explore the influence of the carbon nanotubes functionalized by oxygen groups on the physical and mechanical properties of cement composites. Advantages and disadvantages of the main methods for the homogeneous distribution of carbon nanotubes (CNTs) in solution are discussed. A method for covalent functionalization of CNTs is described. An acid-base titration and dispersion analysis of solutions containing functionalized carbon nanotubes (f-CNTs) was performed. The research data made it possible to propose new technology of preparation of modified concrete.
The results of the work can be used for designing of the additives commonly used in the construction industry, as well as for further studies of the effects of CNTs on the physical and mechanical and structural properties of building materials. Efficient modification of cement composite with f-CNTs was achieved at the concentration of f-CNTs ranging from 0.0004% to 0.0008% by weight of the binder. The observed increase of the concrete mechanical properties is explained by the fact that the CNTs act as nucleation centers for the cement hydration products.
Key words: carbon nanotubes, CNT, MCNT, cement composites, modification, functionalization of carbon nanotubes.
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