CONSTRUCTION
Building Materials and Products

DOI.org/10.5281/zenodo.896996

Potapov V., Efimenko Y., Karabzov A., Gorev D.

VADIM POTAPOV, Doctor of Engineering Sciences, Professor, e-mail: vadim_p@inbox.ru
DENIS GOREV, Senior Researcher,  e-mail: denis.goreff2015@yandex.ru
Research Geotechnological Center FEBRAS
30 Severo-Vostochnoye highway, Petropavlovsk-Kamchatsky, Russia, 683002, P.O. Box 56
YURI EFIMENKO, Candidate of Engineering Sciences, Head of Department, e-mail: efimenko_yu_v@mail.ru
Far Eastern Research Institute of Construction 14 Borodinskaya St., Vladivostok, Russia, 690033
ALEXANDER KARABZOV, Candidate of Geological and Mineralogical Sciences, Senior Researcher, e-mail: karabzov@fegi.ru
Far Eastern Geological Institute FEBRAS
159, 100 years to Vladivostok Av., Vladivostok, Russia, 690022

Mechanism of concrete hardening by hydrothermal nanosilica

Abstract: Experiments were carried out to obtain sols and nanopowders of SiO₂ on the basis of hydrothermal solutions. The processes of orthosilicic acid polycondensation, ultrafiltration membrane concentration and cryochemical vacuum sublimation were carried out to obtain the result. The physical and chemical properties of sols and nanopowders of SiO₂ have been determined through a number of methods. It has been demonstrated that diameters of SiO₂ nanoparticles in sols and nanopowders were within the range of 5-100 nm. The possibility of the use of the obtained silica as a modifying additive to increase the strength of concrete has been substantiated. Presented are the results of the test aimed to heighten concrete compressive strength by the use of nanosilica additive extracted from hydrothermal solution.

Key words: hydrothermal solution, orthosilicic acid, sol, nanopowder, silica, strength.

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