Thermodynamic modelling of the effect of temperature on the hydration of Portland cement

Title: Thermodynamic modelling of the effect of temperature on the hydration of Portland cement
Author(s): B. Lothenbach
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 393 - 400
Total Pages: 8
Nb references: 19
Language: English

Abstract: The composition of the phase assemblage and the pore solution of Portland cements hydrated between 0 and 60 °C can be modelled as a function of time and temperature. The results of thermodynamic modelling show a good agreement with experimental data. At 5 and at 20 °C, a similar phase assemblage was calculated to be present, while just below 50 °C, thermodynamic calculations predict the conversion of ettringite and monocarbonate to monosulfate. Modelling showed that in Portland cements, which have an SO3/Al(Fe)2O3 ratio of < 1 (molar ratio), above 50 °C monosulfate and monocarbonate are present. In Portland cements which contain more SO3 or less Al (SO3/Al(Fe)2O3 > 1), at 50 °C and above monosulfate and ettringite are expected to persist.

Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00