Hydration Kinetics Model of Supersulfated Cement

Supersulfated cement, with higher waste utilization and less cement clinker is the inevitable trend of the development of green material in the rapid developed industrial era. For the wide use of supersulfated cement in our country, the hydration heat is analyzed in this paper. The hydration kinetic parameters are obtained from the hydration heat and hydration heat rate curves measured by the isothermal calorimeter and the simulation based on the Krstulovic-Dabic model. The results show that the hydration heat process after induction period was divided into three periods, nucleation and crystal growth (NG), phase boundary reaction (I), diffusion (D) and the simulation curve shows good trend of hydration and the connecting point of the three hydration processes. The NG process is not consistent with the ideal model, and the hydration rate is relatively slower than simulation rate because of its low content of clinker. The hydration heat of supersulfated cement is extremely low; in addition the second exothermic peak comes much later, which has important significance for large volume concrete pouring.