Characteristic Behavior of Hydration of Magnesium Oxide

Conference paper
Part of the Lecture Notes in Civil Engineering book series (LNCE, volume 62)


A refractory brick is made of heat-resistance material which is mainly magnesium oxide (MgO). The used refractory material can be used for reclamation. But the magnesium oxide which is the main component in refractory blocks tends to be hydrated, resulting in magnesium hydroxide (Mg(OH2)). The hydration from MgO to Mg(OH2) is associated with volume expansion. In the study, a new equipment is developed to accelerate the hydration process and measure volume expansion and expansion pressure. X-ray Diffraction (XRD) and scanning electron microscope (SEM) was adopted to investigate further the hydration process. In this study, disk-shaped refractory materials were used to measure the volume expansion under a given confining stress condition such as 60 kPa, 263 kPa, and 5.94 MPa. And the expansion pressure was also measured under no volume expansion condition. The results show that the volume expansion reaches 380% for 60 kPa and 263 kPa confining stress condition, and 255% for 5.94 MPa confining stress condition. The expansion pressure can reach over 6.5 MPa. The results of this study are applicable to various engineering applications of refractory materials.


magnesium oxide expansion force expansion pressure refractory materials hydration 


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  1. Branda˜o, P., Gonc¸alves, G.E. and Duarte, A.K. (1998). Mechanisms of hydration/ carbonation of basic refractories – Part I. Refract. Appl. News 3(2), pp 6–9.Google Scholar
  2. Branda˜o, P., Gonc¸alves, G.E. and Duarte, A.K. (1998). Mechanisms of hydration/ carbonation of basic refractories - Part II: Investigation of the kinetics of formation of brucite in fired basic bricks. Refract. Appl. News, 3(2), pp 9–11.Google Scholar
  3. Branda˜o, P., Gonc¸alves, G.E. and Duarte, A.K. (1998). Mechanisms of hydration/ carbonation of basic refractories - Part III. Refract. Appl. News, 8(6), pp 23–26.Google Scholar
  4. Kitamura, A., Onizuka, K. and Tanaka, K. (1995). Hydration characteristics of magnesia. Taikabutsu Overseas, 16(3), pp 3–11.Google Scholar
  5. Kaneyasu, A., Yamamoto, S. and Yoshida, A. (1996). Magnesia raw materials with improved hydration resistance. Taikabutsu Overseas, 17(2), pp 21–26.Google Scholar
  6. Layden, G.K. and Brindley, G.W. (1963). Kinetics of vapor-phase hydration of magnesium oxide. J. Am. Ceram. Soc., 46(11), pp 518–522.Google Scholar
  7. Salomao, R., Bittencourt, L., and Pandolfelli, V. (2007). A novel approach for magnesia hydration assessment in refractory castables. Ceramics International, 33(5), pp 803-810.Google Scholar
  8. Thomson, G. W. (1946). The Antoine equation for vapor-pressure data. Chemical reviews, 38(1), pp 1-39.Google Scholar
  9. Wogelius, R.A., Refson, K., Fraser, D.G., Grime, G.W. and Goff, J.P. (1995). Periclase surface hydroxylation during dissolution, Geochim. Cosmochim. Acta, 59(9), pp 1875–1881.Google Scholar
  10. Yoschida, A., Nemoto, T. and Kaneyasu, A. (2003). Evaluation method for hydration resistance of magnesia fine powder and effect of B2O3 content in magnesia raw materials. Proceedings of UNITECR, pp 21–30.Google Scholar
  11. Zhou, S. (2004). Hydration mechanisms of magnesia-based refractory bricks. University of British Columbia,Google Scholar

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© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.Hanyang UnivSeoulRepublic of Korea

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