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 the activation energy is 33 8 kJ/mole and theological 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 lobe limited to temperatures below about 100 degrees C, since new phases occur at higher temperatures. (C) 2010 Elsevier Ltd All rights reserved