ENGINEERING SCIENCES. Building Materials and Products

Potapov V., Kashutin A., Cerdan A.

VADIM V. POTAPOV, Doctor of Technical Sciences, Professor, Head of Laboratory, Research Geotechnological Center, Petropavlovsk-Kamchatsky. 30, Highway Northeast, Petropavlovsk-Kamchatsky, Russia, 683000, e-mail:vadim_p@inbox.ru 
ALEXANDER N. KASHUTIN, Senior Lecturer, Kamchatka State Technical University, Petropavlovsk-Kamchatsky. 35, Kluchevskaya St., Petropavlovsk-Kamchatsky, Russia, 683003, e-mail: kashutin@mail.ru 
ANGEL A. CERDAN, Doctor of Chemistry, Professor, Leading Researcher, Lomonosov Moscow State University, Moscow. 1, p. 3, Lenin Hills, Moscow, GSP-1, Russia, 119991, e-mail: cerdan@mail.ru

The improvement of the properties of concrete (cement-sand-water) by injecting SiO2 nanopowders and sols (with and without superplacticizer)

The article deals with the effect of SiO2 sols, nanopowders, and microsilica (with and without superplacticizer) on the properties of the ‘cement-water’ and ‘cement-sand-water’ systems. Nanoparticles were extracted from natural hydrothermal solutions through the two stage scheme: the membrane concentration and the cryochemical vacuum sublimation of silica sols. The nanoparticles SiO2 were injected in the system ‘cement-water’. The sol SiO2, the microsilica, and the superplicticizer Relamix T2 were injected in the system ‘cement-sand-water’. The measurements of the properties of the solid samples were taken at different ages: from 3 to 28 days. The effect of the nanosilica on the density, strength development, and final strength of concrete samples when compressed and bent has been established.

Key words: nanopowders, silica sol, microsilica, superplacticizer, system of cement-sand-water, water for concrete mixture, compression strength, tensile strength.

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