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RESEARCH OF BUILDING MATERIALS

RESEARCH OF INTERACTION BETWEEN CAUSTIC MAGNESITE AND A MICROSILICA ADDITIVE

Vestnik MGSU 3/2012
  • Ustinova Yuliya Valerievna - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associated Professor, Department of General Chemistry 8 (499) 183-32-92, 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 .
  • Nasonova Alla Evgenevna - Moscow State University of Civil Engineering (MSUCE) post-graduate student, Department of General Chemistry 8 (499) 183-32-92, Moscow State University of Civil Engineering (MSUCE), 26, Yaroslavskoe shosse, Moscow, 129337, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Nikiforova Tamara Pavlovna - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Deputy Chair, Department of General Chemistry, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Kozlov Valeriy Vasilevich - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Department of General Chemistry 8 (499) 183-32-92, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russia.

Pages 100 - 104

The authors argue that a dry mixture composed of caustic magnesite and a microsilica additive represents a binding material which contributes to formation of a durable and water resistant artificial stone. The results of the research of the artificial stone performed through the application of the Fourier IR spectroscopy method are provided. Interaction between magnesium oxide (MgO) as the basic oxide and microsilica as an acidic oxide is proposed. This interaction makes it possible to add water to Sorel cement instead of the magnesium chloride (MgCl2) solution.
Compressive strength of the dry mix containing 10 % of microsilica has been measured. In the event of hydraulic hardening, the compressive strength of the dry mix is 11.5 MPa, while the compressive strength of the water-saturated mix is equal to 12.0 MPa. In the aftermath of the air-setting procedure, the compressive strength of the dry mix is 10.0 MPa, while the compressive strength of the water-saturated mix is 21.0 MPa. The IR spectra of the specimen exhibit vibrations at 1100-400 cm-1 that correspond to the area of Si-O and Si-O-Me stretching vibrations, a peak at 1121-1119 cm-1 that can be assigned to Si-O-Si bond vibrations, and a peak at 474-472 characteristic of Si-O-Mg stretching vibrations. The areas of 3700-3000 cm-1 and 1650-1600 cm-1 are assigned to stretching and deformational vibrations of OH groups, respectively.

DOI: 10.22227/1997-0935.2012.3.100 - 104

References
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  2. Ustinova Yu.V., Nasonova A.E., Kozlov V.V. Povyshenie vodostoykosti magnezial’nykh vyazhushchikh [Improvement of Water Resistance of Magnesia-based Binders]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering], 2010, Issue 4, v. 3. pp. 123—127.
  3. Sidorov V.I., Tupikin E.I., Malyavskiy N.I., Ustinova Yu.V., Platonova E.E. Ekologicheskie aspekty primeneniya i ekspluatatsii konstruktsiy na osnove steklomagnievogo lista [Environmental Aspects of Application and Maintenance of Structures of a Glass-Magnesium Sheet]. Jekologija urbanizirovannyh territorij [Ecology of Urban Lands], 2009, Issue 4, pp. 65—68.
  4. Nefed’ev A.P. Regulirovanie protsessov tverdeniya magnezial’nogo vyazhushchego [Regulation of Processes of Hardening of Magnesium Binding Materials]. Collection of research papers of Russian students, available at: http // www.cs-alternativa.ru/text/1954. Date of access: February 19, 2012.
  5. Des King. Microsilica in Concrete. Concrete Masonry. Íîng Kong Concrete Repair Association. Available at: http://www.hkcra.com.hk/tech_mason_00_2.htm. Date of access: February 19, 2012.
  6. B. Tooper, L. Cartz. Structure and Formation of Magnesium Oxychloride Sorel Cements. Nature 211, July 2, 1966. pp. 64—66.
  7. Pustovgar A.P. Effektivnost’ dobavok mikrokremnezema pri modifikatsii betona [Efficiency of Microsilica Additives Introduced into the Concrete]. StroyPROFIl’ [Building Profile]. 2005, Issue 8, available at: http // stroyprofile.com/archive/1980. Date of access: February 19, 2012.
  8. Shishelova T.I., Sozinova T.V., Konovalova A.N. Praktikum po spektroskopii. Voda v mineralah. [Workshop in Spectroscopy. Water in Minerals]. Moscow, Akademiya estestvoznaniya [Academy of Nature Studies], 2010.

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