| Name | Ordinary Portland Cement | GRADE | 42.5RGrade | | EXAMINE ITEM | UNIT | GB175-1999 | FINAL DATA | | Fineness | Specific Surface | m2/kg | ≥300 | 385 | | 0.08mm Tail Over | % | ≤10.0 | 0.9 | | Setting Time | Initial Set | min | ≥ 45min | 207 | | Final Set | min | ≤10h | 300 | | Folding Strength | 3Days | Mpa | ≥4.0 | 6.5 | | 28Days | Mpa | ≥6.5 | 8.0 | | Compressive Strength | 3Days | Mpa | ≥21.0 | 32.7 | | 28Days | Mpa | ≥42.5 | 50.1 | | Invariability | | Eligible | Eligible | | SO3 | % | ≤3.5 | 2.07 | | MgO | % | ≤5.0 | 2.86 | | Loss Ignitilon | % | ≤5.0 | 2.13 |
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