Clinker
Sulfate Resistant Portland Clinker (Grey)
C₃A < 5%; for cements used in high-sulfate environments (seawater, sewage).
Description
Sulfate-resistant grey Portland clinker with controlled C₃A content, supplied in bulk to grinding stations and cement producers for the manufacture of sulfate-resistant cements destined for seawater, sewage and aggressive industrial exposure.
Application Areas
- Production of CEM I-SR / Type V cements
- Inter-grinding with supplementary cementitious materials
- Export to grinding stations along trade corridors
Sales Form / Packaging
- Bulk vessel (handysize / supramax)
Usage Conditions
- Intended for cement grinding stations and producers with calibrated mills.
- Blend with gypsum and supplementary materials per target cement specification.
Storage
- Store in covered silos or sheltered yards to prevent moisture pickup.
- Avoid prolonged exposure to humidity to preserve grindability.
Technical Specifications
Chemical Requirements
| Property | Unit | Standard Limit | Test Results |
|---|---|---|---|
| SiO₂ | % | — | 19.90–22.80 |
| Al₂O₃ | % | — | 3.80–5.40 |
| Fe₂O₃ | % | — | 4.35–5.90 |
| CaO | % | — | 63.80–67.00 |
| MgO | % | Max 5.0 | 1.00–3.70 |
| SO₃ | % | — | 0.25–1.60 |
| Cl | ppm | — | 40–300 |
| Loss on Ignition (LOI) | % | — | 0.05–0.50 |
| Insoluble Residue | % | — | 0.10–0.70 |
| Free CaO | % | — | 0.40–2.50 |
| Cr (VI) | ppm | — | 2–50 |
| Na₂O | % | — | 0.03–0.15 |
| K₂O | % | — | 0.30–0.80 |
| Na₂O Eq. | % | — | 0.30–0.60 |
| Lime Saturation Factor (LSF) | – | — | 91.00–101.00 |
| Silica Modulus (SM) | – | — | 1.90–2.60 |
| Alumina Modulus (AM) | – | — | 0.60–1.20 |
| Tricalcium Aluminate (C₃A) | % | Max 5.0 | 0.50–4.99 |
| CaO/SiO₂ | – | Min 2.0 | 2.80–3.40 |
Physical & Mechanical Requirements
| Property | Unit | Standard Limit | Test Results |
|---|---|---|---|
| Specific Gravity | g/cm³ | — | 3.12–3.22 |
| Specific Surface (Blaine) | cm²/g | — | 3300–3500 |
| Soundness | mm | — | 0.0–4.0 |
| Normal Consistency | % | — | 21.5–25.0 |
| Initial Setting Time | min | — | 90–230 |
| Sieve Residue on 40 mm | % | — | 0.0–22.0 |
| Sieve Residue on 25 mm | % | — | 0.0–32.0 |
| Sieve Residue on 10 mm | % | — | 20.0–85.0 |
Compressive Strength (EN 196-1)
| Property | Unit | Standard Limit | Test Results |
|---|---|---|---|
| 2 Days | MPa | — | 19.5–29.5 |
| 28 Days | MPa | — | 46.0–58.0 |