Abstract
When cement-based materials with a low water–binder ratio are exposed to water, the internal unhydrated cementitious components undergo rehydration. Rehydration tests of paste samples with a low water–binder ratio were conducted to determine the hydration degree under water immersion conditions. A modified rehydration model was developed based on a thermodynamic model for cement hydration and used to predict the hydration degrees of samples at different times. The modified rehydration model closely agreed with the test data. The ambient temperature significantly impacted material rehydration. The temperature effect on the rehydration reaction rate constant follows the Arrhenius law.
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