Structure Formation and Properties of Activated Supersulfate Cement

Area of Science:

• Materials Science
• Civil Engineering
• Chemical Engineering

Background:

• Supersulfated cement (SSC) is an alternative binder with potential environmental benefits.
• Understanding SSC hardening is crucial for optimizing its performance.
• The influence of various admixtures on SSC properties requires detailed investigation.

Purpose of the Study:

• To investigate the phase composition and structure of SSC during hardening.
• To evaluate the impact of activators, accelerators, and superplasticizers on SSC properties.
• To develop predictive models for SSC strength based on composition.

Main Methods:

• X-ray analysis
• Electron microscopy
• Ultrasonic analysis
• Standard consistency and setting time tests
• Mechanical strength testing
• Mathematical modeling

Main Results:

• Phosphogypsum is a more effective sulfate activator than gypsum stone for SSC.
• Polycarboxylate superplasticizers reduce standard consistency and long-term strength loss.
• Optimized SSC compositions show significant strength increases (up to 35% at 7 days).
• Mathematical models were developed to predict SSC strength based on composition.

Conclusions:

• SSC hardening is significantly influenced by activators and admixtures.
• Polycarboxylate superplasticizers improve SSC workability and durability.
• Optimized SSC formulations offer enhanced mechanical properties and reduced strength degradation.