Solution calorimetry to assess effects of water-cement ratio and low temperature on hydration heat of cement

This study investigated the effects of the water-cement ratio and low temperature on the hydration heat of cement using solution calorimetry. When curing at 20 degrees C, a lower water-cement ratio resulted in a higher cumulative hydration heat and hydration heat evolution rate at 24 h, but subsequently decreased. A lower water-cement ratio led to a lower cumulative hydration heat when curing at 5 degrees C and 0 degrees C. A higher water-cement ratio caused lower cumulative hydration heat when curing at -5 degrees C. The cumulative hydration heat of the cement paste increased with the curing temperature, and the influence of the negative temperature on the cumulative hydration heat of the cement paste increased with the water-cement ratio. The compound exponential model was used to predict the hydration heat of cement paste maintained above 0 degrees C. The results obtained by the logarithmic function model are in good agreement with the experimental results for curing at negative temperature. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

This study investigated the effects of water-cement ratio and low temperature on the hydration heat of cement. The results showed that the cumulative hydration heat and heat evolution rate were influenced by the water-cement ratio and curing temperature, impacting the overall hydration process.