Waterproof Magnesia Binder for Composite Materials

Abstract:

The paper presents a study of structure formation during the hardening of a new water resistant hydraulic magnesium cement. Improvement of water resistance and the manifestation of hydraulic properties in magnesium cement are associated with the use of a fundamentally new mixing liquid involving a magnesium bicarbonate solution. Use of this solution makes possible for the magnesium composition to harden not only in air, but also in water. The Coefficient of resistance is 1.0–1.8. When mixing the magnesium cement with an aqueous solution of magnesium bicarbonate, the main products of hardening are magnesium hydroxide and magnesium hydrocarbonates. The increase of the hydrocarbon phase contributes to the strengthening characteristics of magnesia compositions. Magnesium hydrocarbonates are insoluble in water, which provides the increased water resistance of magnesia compositions and the opportunity to harden and gain strength in water.

• Periodical: Key Engineering Materials (Volume 712)
• Pages: 182-187
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.712.182
• Online since: September 2016
• Authors: Natalia A. Mitina*, Inna B. Revva, Alexander A. Ditts, Dmitriy Simonov
• Keywords: Magnesia Binder, Magnesium Bicarbonates, Waterproof

References

[1] Zh. Liu, Sh. Wang, J. Huang, Zh. Wei, B. Guan, J. Fang, Experimental investigation on the properties and microstructure of magnesium oxychloride cement prepared with caustic magnesiteand dolomite. Constr. and Build. Mater. 85 (2015) 247–255.

DOI: 10.1016/j.conbuildmat.2015.01.056

[2] T.F. Sweet, The Thermogravimetric Study of Hydration Products and Sulfo-Magnesia Cements, Polzunovsky Gazette. 3 (2010) 100–103.

[3] V.V. Zimich, L. Ya. Kramar, B. Ya. Trofimov, Reduced Hygroscopity and Improved Water Resistance of Chlorine Magnesia Stone by Introducing Ferric Iron, Build. Mater. 5 (2009) 58–61.

[4] V.V. Zimich, L. Ya. Kramar, T.N. Chernykh, V.N. Pudovikov, A.V. Perminov, Features of the Influence of Sol Additives of Iron Hydroxide on the Structure and Properties of Magnesia Stone, J. of the S. Ural State Univ. Ser. Constr. Archit.,. 13 (2011).

[5] V.I. Vereshchagin, V.N. Smirenskaya, S.V. Érdman, Water-resistant blended oxychlorаte cements, Glass and Ceram. 54 (1997) 368–372.

DOI: 10.1007/bf02768185

[6] V.N. Zyryanova, E.V. Lytkina, G.I. Berdov, Increased Mechanical Strength and Water Resistance of Magnesia Cement Properties with the Introduction of Mineral Fillers, Proc. High. Educ. Inst. Constr. 3 (2010) 21–26.

[7] W. F. Cole, T. Demediuk, X-Ray, thermal, and Dehydration studies on Magnesium oxychlorides, Aust. J. Chem. 8 (1955) 234–251.

DOI: 10.1071/ch9550234

[8] K.V. Gapparova, T.M. Khudyakova, V.F. Verner, L. Sh. Atanbayeva, Production of Waterproof Composite Magnesia Cement on the Basis of Local Mineral Resources. Modern Applied Science. 9, 3 (2015).

DOI: 10.5539/mas.v9n3p309

[9] M. Shand, The Chemistry and Technology of Magnesia. Hardcover, 2006, 266.

[10] V.A. Lotov, N.A. Mitina, Synthesis of Water Resistant Magnezium Cement, Techn. Technol. Silic. 3 (2010) 19-22.

[11] A.P. Smirnov, V.A. Lotov, V.A. Arkhipov, A.N. Prokhorov, I.V. Reznikov, inventors; Tomsk Polytechnic University, assignee. A technique for producing ultradispersed carbonate powders. RF patent No. 2374176. 2009 Nov 27.

[12] M. Akao, S. Iwai, The hydrogen bonding of hydromagnesite, Acta Crystallogr., Sect. B: Struct. Sci. 33 (1977) 1273–1275.

DOI: 10.1107/s0567740877005834

[13] G. Raade, Dypingite, a new hydrous basic carbonate of magnesium, from Norway. Am. Miner. 55 (1970) 1457.

[14] B. Nashar, Barringtonite – a new hydrous magnesium carbonate from Barrington Tops, New South Wales, Australia. Miner. Mag. 34 (1965) 370.

DOI: 10.1180/minmag.1965.034.268.31

[15] C. Palache, H. Berman, C. Frondel, The system of mineralogy, 7th ed., John Wiley & Sons, New York, (1944).

[16] C. Unluer, A. Al-Tabbaa, Characterization of light and heavy hydrated magnesium carbonates using thermal analysis, J. Therm. Anal. Calorim. 115 (2013) 595–607.

DOI: 10.1007/s10973-013-3300-3

[17] C. Unluer, A. Al-Tabbaa, Impact of hydrated magnesium carbonate additives on the carbonation of reactive MgO cements, Сem. And Conc. Res. 54 (2013) 87–97.

DOI: 10.1016/j.cemconres.2013.08.009

[18] P. Ballirano, C. De Vito, S. Mignardi, V. Ferrini, Phase transitions in the Mg-CO2-H2O system and the thermal decomposition of dypingite, Mg5(CO3)4(OH)2·5H2O: Implications for geosequestration of carbon dioxide. Chemical Geology 340 (2013) 59–67.

DOI: 10.1016/j.chemgeo.2012.12.005