Super-Sulphate Cement
Definition:
- A type of cement primarily used where sulfate resistance is required.
Composition:
- Made up largely of blast furnace slag.
- Contains calcium sulphate, typically in the form of gypsum or anhydrite.
- A minor proportion of Portland cement clinker.
Properties:
- High sulfate resistance making it suitable for environments with high sulphate concentrations.
- Low heat of hydration, beneficial for mass concrete structures.
- High workability.
Advantages:
- Superior performance in aggressive sulfate environments compared to ordinary Portland cement.
- Environmentally friendly due to the use of industrial by-products like slag.
Applications:
- Ideal for use in marine structures, sewage treatment plants, chemical plants, and other settings exposed to sulfate attack.
- Suitable for constructing dams, bridges, and underground structures.
Considerations:
- Curing must be carefully controlled due to its slow strength gain.
- Quality and consistency of raw materials must be ensured for optimal performance.
Comparison with Other Cements:
- Performs better than Portland cement in environments with high sulfate exposure.
- Lower early strength compared to high-strength cements but catches up over time.
0 Comments