Clinker
Low Alkali Portland Cement Clinker (Grey)
Equivalent alkali ≤ 0.60%; resists alkali–silica reaction.
Description
Controlled-alkali grey Portland cement clinker for grinding into cements that mitigate alkali–silica reaction, ideal for export to markets with reactive aggregates.
Application Areas
- Production of low-alkali Portland cements
- Concrete with potentially reactive aggregates
- Export to grinding facilities worldwide
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 | % | — | 19.50–21.65 |
| Al₂O₃ | % | — | 4.20–5.95 |
| Fe₂O₃ | % | — | 3.40–5.20 |
| CaO | % | — | 64.50–68.10 |
| MgO | % | Max 5.0 | 1.00–3.90 |
| SO₃ | % | — | 0.25–1.70 |
| Cl | ppm | — | 10–400 |
| Loss on Ignition (LOI) | % | — | 0.01–0.50 |
| Insoluble Residue | % | — | 0.10–0.80 |
| Free CaO | % | — | 0.40–2.50 |
| Cr (VI) | ppm | — | 2–50 |
| Na₂O | % | — | 0.03–0.25 |
| K₂O | % | — | 0.30–0.87 |
| Na₂O Eq. | % | — | 0.25–0.60 |
| Lime Saturation Factor (LSF) | – | — | 98.00–104.70 |
| Silica Modulus (SM) | – | — | 1.90–2.50 |
| Alumina Modulus (AM) | – | — | 1.00–1.60 |
| CaO/SiO₂ | – | Min 2.0 | 3.00–3.50 |
Physical & Mechanical Requirements
| Property | Unit | Standard Limit | Test Results |
|---|---|---|---|
| Specific Gravity | g/cm³ | — | 3.11–3.20 |
| Specific Surface (Blaine) | cm²/g | — | 3300–3500 |
| Soundness | mm | — | 0.0–4.0 |
| Normal Consistency | % | — | 21.0–25.0 |
| Initial Setting Time | min | — | 70–205 |
| Sieve Residue on 40 mm | % | — | 0.0–27.0 |
| Sieve Residue on 25 mm | % | — | 0.0–43.0 |
| Sieve Residue on 10 mm | % | — | 20.0–75.0 |
Compressive Strength (EN 196-1)
| Property | Unit | Standard Limit | Test Results |
|---|---|---|---|
| 2 Days | MPa | — | 24.5–35.0 |
| 28 Days | MPa | — | 47.0–59.0 |