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Frontiers of Structural and Civil Engineering >> 2017, Volume 11, Issue 4 doi: 10.1007/s11709-017-0438-2

The effect of SiO

. Department of Civil Engineering and Mechanics, Advanced and Nano Cement-Based Materials Laboratory, University of Wisconsin-Milwaukee, Milwaukee 53211, USA.. Universidad Autónoma de Nuevo León, Av. Universidad s/n, Cd. Universitaria, San Nicolás de los Garza, 66455 Nuevo León, México.. The Belgorod State Technological University named after V.G. Shoukhov, Belgorod, Russia.. Geotechnological Research Center, Far East Branch of Russian Academy of Science, Petropavlovsk-Kamchatsky 683002, Russia

Accepted: 2017-08-29 Available online: 2017-11-10

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Abstract

The nanoparticles of SiO were used in cement systems to modify the rheological behavior, to enhance the reactivity of supplementary cementitious materials, and also to improve the strength and durability. In this research, low-cost nano-SiO particles from natural hydrothermal solutions obtained by membrane ultrafiltration and, optionally, by cryochemical vacuum sublimation drying, were evaluated in portland cement based systems. ??The SiO -rich solutions were obtained from the wells of Mutnovsky geothermal power station (Far East of Russia). The constant nano-SiO dosage of 0.25% (as a solid material by weight of cementitious materials) was used to compare the cement systems with different nanoparticles against a reference mortar and a commercially available nano-SiO . Nanoparticles were characterized by X-Ray Diffraction (XRD), BET Surface Area, Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FTIR) spectroscopy techniques. It was demonstrated that the addition of polycarboxylate ether superplasticizer and the dispersion treatment using an ultrasound processor can be used to facilitate the distribution of nano-SiO particles in the mixing water. The effect of nano-SiO particles in portland cement mortars was investigated by evaluating the flow, heat of hydration and compressive strength development. It was demonstrated that the use of nano-SiO particles can reduce the segregation and improve strength properties.

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