NDLI: Kinetic study of the magnesium oxychloride cement cure reaction

Content Provider	Springer Nature Link
Author	Góchez, Roque Wambaugh, Jim Rochner, Brett Kitchens, Christopher L.
Copyright Year	2017
Abstract	Magnesium oxychloride (MOC) is a ceramic material with significant fire-resistant properties and growing potential as an alternative building material for passive fire protection systems. The present study examined the magnesium oxychloride 5-phase cure reaction at temperatures from 35 to 55 °C using time-resolved quantitative X-ray diffraction and differential scanning calorimetry to monitor kinetics. The reaction was characterized as a two-step process: dissolution of magnesium oxide followed by crystallization of magnesium oxychloride from the solvated state. With stoichiometric proportions, 37% of the MgO dissolves before the onset of crystallization at a critical amorphous concentration. A maximum crystallinity of 82–84% was achieved for each temperature. Assuming first-order kinetics for both MgO dissolution and MOC crystallization, a kinetic model predicts 42.4 and 26.1 kJ/mol for dissolution and crystallization activation energies, respectively. This model was applied to pilot-scale production and accurately predicts the cure reaction time as a function of cure temperature. In an alternative approach to modeling the cure reaction, the Avrami nucleation and growth model was fit to calorimetric measurements. This model predicts diffusion-controlled, one-dimensional growth with an activation energy of 72.4 kJ/mol, which accounts for both dissolution and crystallization.
Starting Page	7637
Ending Page	7646
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	52
Issue Number	13
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2017-03-29
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography and Scattering Methods Classical Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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