RESEARCH OF BUILDING MATERIALS

Study of the properties of fine-grained concrete modifiedby the nanodisperse serpentinite additive

Vestnik MGSU 3/2013
  • Pustovgar Andrey Petrovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Director, Research and Scientific Institute for Construction Materials and Technologies, Professor, Department of Construction of Nuclear Installations, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Lukuttsova Natal’ya Petrovna - Federal State Educational Institution of Higher Education Bryansk State Technological University of Engineering Doctor of Technical Sciences, Professor, chair, Department of Building Structures Production, Federal State Educational Institution of Higher Education Bryansk State Technological University of Engineering, prospekt Stanke Dimitrova str., Bryansk, 241037, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ustinov Aleksandr Gennad’evich - Bryansk State Academy of Engineering and Technology (BGITA) postgraduate student, Department of Production of Structural Units, Bryansk State Academy of Engineering and Technology (BGITA), 3 pr. Stanke Dimitrova, Bryansk, 241037, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 155-162

The purpose of the research consists in development of a nano-sized additive containing mineral serpentinite designated for fine-grained concretes. In this article, the results of research into the influence of nanodisperse mineral serpentinite additives on physical-mechanical properties of fine-grained concrete are provided.Nano-sized particles are obtained by the milling of serpentinite together with C-3 plasticizer, the content of which is equal to 1 % of the mass of serpentine, and the milling time is 30 min. Milled nano-sized particles are dispersed in the water environment using the ultrasonic technology. The ultrasonic treatment frequency is 35 KHz, and the exposure time varies from 15 to 60 min.The study of the effect of the nanodisperse additive is performed using samples of fine-grained concretes made of white-color cement and quartz sand and hardened according to the regular procedure.If the concentration of serpentinite is equal to 0.01 % and the additive is obtained by the 15-minute exposure to ultrasonic dispersion, the 0.15 % content of the nanodisperse additive added to the fine concrete improves the compressive strength 1.5-fold, the bending strength — 1.3-fold, and improves the average density by 8%, while the water absorption rate goes down 1.7-fold. Resulting strength properties comply with the structure of cement identified with the help of an electronic microscope.

DOI: 10.22227/1997-0935.2013.3.155-162

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