APPARENT ACTIVATION ENERGY AND ITS APPLICATION IN THE NUMERICAL SIMULATION OF BLENDED CEMENT HYDRATION PROCESS
-
Published:2002
Xiangjun Xiong, K Van Breugel, 2002. "APPARENT ACTIVATION ENERGY AND ITS APPLICATION IN THE NUMERICAL SIMULATION OF BLENDED CEMENT HYDRATION PROCESS", Innovations and Developments In Concrete Materials And Construction: Proceedings of the International Conference held at the University of Dundee, Scotland, UK on 9–11 September 2002, Ravindra K. Dhir, Peter C. Hewlett, Laszlo J. Csetenyi
Download citation file:
Kinetics of cement hydration is dependent on the reaction temperature and apparent activation energy (Ea) is introduced to consider the temperature effect on the hydration. This paper first made an experimental study on the kinetics of Portland cement and blast furnace slag cement using isothermal Calorimetry at 20, 30, and 40 °C. Two different water/cement ratios were used, viz. 0.4 and 0.6. Based on the experimental data, Ea for Portland cements and blast furnace cement was calculated dynamically with the progress of hydration. It was found that Ea exhibits dependence on the degree of hydration, water cement ratio, and temperature. Variation of Ea along with the degree of hydration may suggest a change in the mechanisms of hydration. Numerical simulation was done using the HYMOSTRUC model with a new expression of Ea and good agreement with experiment data was found.
INTRODUCTION
DESCRIPTION OF EXPERIMENTS
EXPERIMENT RESULTS
APPLICATION
CONCLUSIONS
ACKNOWLEDGEMENTS
REFERENCES
