A comparison study of Portland cement hydration kinetics as measured by chemical shrinkage and isothermal calorimetry

Two different methods of evaluating cement hydration kinetics, namely chemical shrinkage and isothermal calorimetry tests, are used to investigate the early stage hydration of different classes of oilwell cement at various temperatures. For a given cement paste, the hydration kinetics curves measure...

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Bibliographic Details
Published in:Cement & concrete composites 2013-05, Vol.39, p.23-32
Main Authors: Pang, Xueyu, Bentz, Dale P., Meyer, Christian, Funkhouser, Gary P., Darbe, Robert
Format: Article
Language:English
Subjects:
Calorimetry
Cement hydration
Cements
Chemical shrinkage
Composition effects
Computer simulation
Curing
Heat of hydration
Hydration
Isothermal calorimetry
Kinetics
Oilwell cement
Pastes
Shrinkage
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Summary:Two different methods of evaluating cement hydration kinetics, namely chemical shrinkage and isothermal calorimetry tests, are used to investigate the early stage hydration of different classes of oilwell cement at various temperatures. For a given cement paste, the hydration kinetics curves measured by the two methods are proportional to each other at the same curing temperature. The ratio of heat of hydration to chemical shrinkage for different cements used in this study ranges from 7500J/mL to 8000J/mL at 25°C and increases almost linearly with increasing curing temperature at a rate that varies only slightly with cement composition (approximately 58J/mL per °C). A previously proposed scale factor model for simulating the effect of curing temperature and pressure on cement hydration kinetics is further validated in this study for its temperature aspect. The model is shown to be particularly helpful in correcting for slight temperature errors in the experiments.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2013.03.007