The hydration of slag,part 2: reaction models for blended cement |
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Authors: | W Chen H J H Brouwers |
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Affiliation: | (1) Faculty of Engineering Technology, Department of Civil Engineering, University of Twente, P.O. Box 217, Enschede, 7500 AE, The Netherlands |
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Abstract: | The hydration of slag-blended cement is studied by considering the interaction between the hydrations of slag and Portland
cement clinker. Three reaction models for the slag-blended cement are developed based on stoichiometric calculations. These
models correlate the compositions of the unhydrated slag-blended cement with the quantities and compositions of the hydration
products. The model predictions are further used to calculate some properties of hydrating slag cement pastes, including the
molar fractions of products, the water retention, chemical shrinkage and porosities of pastes. The models are validated by
comparing the model predictions with the measurements and proven to be successful in quantifying the hydration products, predicting
the composition of the main hydration product (C-S-H) and calculating the properties of the hydration process. The model predictions
show that as the slag proportions in the blended cement changes, water retention in the hydration products changes only slightly
if compared to that of Portland cement, but the chemical shrinkage can vary in a wide range, depending on the slag hydration
degree in the cement. |
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