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Kinetic modelling of the thermal decomposition of ettringite into metaettringite
Abstract : Despite recent insights into thermal stability of ettringite and structural changes during decomposition, a lack of knowledge on nucleation and growth mechanisms of metaettringite remained. Therefore, a better understanding of the kinetic modelling of this heterogeneous reaction was proposed. Thanks to an experimental approach allowing to check the validity of kinetic assumptions (rate-determining step, expression of the rate as d alpha/dt=k f(alpha)...), a good agreement was found between the calculated and experimental alpha vs. t and d alpha/dt vs. t kinetic curves. The reaction area of the region in which the rate-limiting step occurs was also elucidated. Finally, we demonstrated that the rate-limiting step of the growth process follows an Arrhenius law in non-isothermal conditions.
Cited literature [10 references]
https://hal-emse.ccsd.cnrs.fr/emse-00449727
Contributor : Andrée-Aimée Toucas <>
Submitted on : Sunday, September 19, 2010 - 9:33:52 PM
Last modification on : Friday, March 6, 2020 - 1:35:55 AM
Document(s) archivé(s) le : Monday, December 20, 2010 - 2:23:03 AM
Contributor : Andrée-Aimée Toucas <>
Submitted on : Sunday, September 19, 2010 - 9:33:52 PM
Last modification on : Friday, March 6, 2020 - 1:35:55 AM
Document(s) archivé(s) le : Monday, December 20, 2010 - 2:23:03 AM
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JP-CCR-36-11-original.pdf
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