Effect of pressure on early hydration of class H and white cement

The change in viscosity of cement slurry with temperature and pressure can be predicted by assuming that hydration can be treated as an activated process and that a given viscosity corresponds to a fixed degree of reaction. For Class H and White cements, chemical shrinkage experiments indicate that...

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Bibliographic Details
Published in:Cement and concrete research 2010-06, Vol.40 (6), p.845-850
Main Authors: Scherer, George W., Funkhouser, Gary P., Peethamparan, S.
Format: Article
Language:English
Subjects:
Activation energy
Applied sciences
Buildings. Public works
Cement concrete constituents
Cements
Exact sciences and technology
Hydration
Kinetics
Materials
Modeling
Moles
Phases
Properties of anhydrous and hydrated cement, test methods
Rheology
Shrinkage
Slurries
Viscosity
Workability
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Summary:The change in viscosity of cement slurry with temperature and pressure can be predicted by assuming that hydration can be treated as an activated process and that a given viscosity corresponds to a fixed degree of reaction. For Class H and White cements, chemical shrinkage experiments indicate that the activation energy is 33.8 kJ/mole and rheological measurements yield an activation volume of −30 cm 3/mole. With these parameters, it is possible to predict the limit of pumpability of the slurry (which corresponds to a viscosity of about 2.5 Pa s) for arbitrary temperature and pressure cycles. This method of prediction requires that the physics of the process remain the same, but simply change in rate; therefore, the range of applicability is expected to be limited to temperatures below about 100 °C, since new phases occur at higher temperatures.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2010.01.013