Modification of Materials on the Basis of Cement with Hydrothermal Nano-Silica

The influence of silica nano-particles obtained from hydrothermal solutions concentrated at the Mutnovskoye deposit of the South Kamchatka on the properties of the cement-sand mor- tar and heavy concrete has been studied. The ultra-sound treatment of the solution was used for more efficient distribution of particles in the liquid volume. It is established that the nano-silica extracted from the hydrothermal solution in the form of sol and nano-powder actively influences on the density: improves it due to the filling of micro-pores of the cement stone with additional newgrowths obtained as a result of active interaction of the powder; on the rate of strength gain at early stages of hardening; the ultimate strength when compress- ing materials on the basis of cement, depending on the mass percent of the nano-additive introduction. The most pronounced effect is observed when introducing this additive paired with a superplasticizer.

V.V. POTAPOV¹ , Doctor of Sciences (Engineering);
E.N. GRUSHEVSKAYA² , Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.),
S.N. LEONOVICH² , Doctor of Sciences (Engineering), Foreign Member of RAACS 

¹ Scientific-Research Geotechnological Center Far Eastern Branch of the Russian Academy of Sciences (Postbox 56, 30, North-Eastern Highway, Petropavlovsk-Kamchatsky 683002, Russian Federation) 
² Belarusian National Technical University (65, Nezavisimosti Avenu, Minsk, 220013, Belarus)

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