Type 1
Portland cement 1-425
Portland Type I, class 425, conforming to CEM I 42.5 N and INSO 389.
| Property | AWCC range | Standard requirement |
|---|---|---|
| Standard | ||
| European standard | CEM I 42.5 N | BS EN 197-1 |
| US standard | Type I | ASTM C150 |
| Iranian standard | Type 1-425 | INSO 389 |
| Chemical composition, % by weight | ||
| SiO₂ | — | — |
| Al₂O₃ | — | — |
| Fe₂O₃ | — | — |
| CaO | — | — |
| MgO | Max 3.0 | Max 6.0 |
| SO₃ | Max 3.0 | Max 3.0 |
| Total alkali | Max 0.9 | — |
| Loss on ignition (LOI) | Max 2.0 | Max 3.0 |
| Insoluble residue (IR) | Max 1.0 | Max 1.5 |
| Lime saturation factor (LSF) | Min 92.0 | — |
| Tricalcium silicate (C₃S) | Min 50.0 | — |
| Dicalcium silicate (C₂S) | Max 22.0 | — |
| Tricalcium aluminate (C₃A) | Max 7.0 | — |
| Tetracalcium aluminoferrite (C₄AF) | Max 13.0 | — |
| Physical and mechanical properties | ||
| Blaine fineness, m²/kg | Min 320 | Min 260, Max 360 |
| Autoclave expansion, % | Max 0.07 | Max 0.8 |
| Residue on 45 µm sieve, % | Max 12.0 | — |
| Initial setting time, minutes | Min 110 | Min 45 |
| Final setting time, minutes | Max 250 | Max 375 |
| Compressive strength, 2 days, MPa | Min 24.0 | Min 10.0 |
| Compressive strength, 7 days, MPa | — | — |
| Compressive strength, 28 days, MPa | Min 48.0 | Min 42.5, Max 62.5 |
Potential phase composition, statistical conformity and uncertainties are calculated according to ASTM and EN.
Specification sheetProducts