Effect of temperature on hydration properties of high-ferrite Portland cement
摘要
Marine resources are vital strategic assets for sustainable human development, and high-ferrite Portland cement (HFC) holds great promise for application in marine engineering due to its favorable durability and performance characteristics. To investigate the hydration behavior of cement under different thermal conditions, the isothermal calorimetry method was used to measure the heat evolution curves of HFC and Type I ordinary Portland cement (P.I) at 293.15 K, 323.15 K, and 343.15 K. The Krstulovic–Dabić hydration kinetics model was employed to calculate and analyze the reaction parameters at each temperature. The results showed that increasing the temperature significantly shortened the induction period and accelerated the heat release rate of both HFC and P.I. The 3-day cumulative hydration heat reached its peak at 50 °C, with values of 384.8 J g−1 for HFC and 322.5 J g−1 for P.I. At 343.15 K, the third heat release peak of P.I remained distinct, while in HFC, it merged into the main peak, indicating a different hydration mechanism. Kinetic analysis revealed that for HFC, the hydration reaction was less sensitive to temperature compared with P.I. From 293.15 to 343.15 K, the rate constant for the nucleation and growth stage (K1′) of HFC increased by approximately 200%, while P.I showed an increase of over 300%. The transition points of hydration stages (α1, α2) also shifted with temperature, reflecting changes in reaction mechanisms. Notably, high temperature promoted the diffusion-controlled stage more significantly in HFC than in P.I, indicating enhanced long-term hydration stability in marine environments. These findings offer valuable insight into the temperature-dependent hydration mechanisms of ferrite-rich cement and provide theoretical support for its application in high temperature or marine environments.