Rapid setting mechanism of sulfoaluminate cement
Release time: 2025-05-07
Chemical reaction acceleration: anhydrous calcium sulphoaluminate
The rapid setting mechanism of sulfoaluminate cement mainly includes the following aspects:
Chemical reaction acceleration: anhydrous calcium sulphoaluminate and dicalcium silicate in sulphoaluminate cement will dissolve rapidly during hydration, promoting the dissolution and hydration of C_4A_3S and C_2S, and generating AFt, AH_3 gel and C-S-H gel. These reactions accelerate the setting process of cement.
Ion exchange: The ion exchange in sulfoaluminate cement also plays a crucial role. During the hydration process, ion exchange causes a change in the chemical composition of the cement slurry, thereby accelerating its setting.
Formation of ettringite: ettringite (AFt) plays a skeletal role in the hydration products of sulfoaluminate cement and is the main source of early strength. Needle shaped ettringite interlaces with each other to form a dense structure, further accelerating the hardening process of cement.
The influence of environmental factors: Environmental temperature and humidity have a significant impact on the rapid setting effect of sulfoaluminate cement. Higher temperature and appropriate humidity are beneficial for the hydration reaction of cement, thereby accelerating the setting speed.
Characteristics and application scenarios of sulfoaluminate cement:
Rapid setting characteristics: Sulfate aluminate cement has the characteristic of rapid setting and hardening, which can achieve demolding strength in a short time without adding setting promoting components, simplify the process, and reduce costs.
Low alkalinity and good low-temperature performance: The liquid phase alkalinity of sulfoaluminate cement is low, and the foaming speed is slow, which is beneficial for process operation and stable foaming. In addition, it can maintain good performance at lower temperatures and is suitable for production in cold regions.
Application scenarios: Due to its rapid setting and good mechanical properties, sulfoaluminate cement is widely used in rapid repair, prefabricated components, and special engineering, especially in situations where rapid construction is required.
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