Ordinary portland cement 42.5,42.5R
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Portland cement |
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Items |
Units |
National |
Internal |
National |
Internal |
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Sample size |
Kg |
/ |
/ |
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|
SO3 |
% |
≤3.5 |
≤3.5 |
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|
MgO |
% |
≤6.0 |
≤6.0 |
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|
Cl |
% |
≤0.06 |
≤0.06 |
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|
Loss |
% |
≤5.0 |
≤5.0 |
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|
Fineness (specific surface) |
㎡/kg |
≥300 |
358 |
≥300 |
385 |
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Standard consistency water |
% |
/ |
/ |
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|
Time |
Initial |
H:Min |
≥0:45 |
4:50 |
≥45 |
228 |
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Final |
H:Min |
≤10:00 |
5:45 |
≤600 |
368 |
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Soundness pat test |
/ |
past |
/ |
past |
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Bending strength |
3d |
MPa |
≥3.5 |
≥4.0 |
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|
28d |
MPa |
≥6.5 |
≥6.5 |
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Compressive strength |
3d |
MPa |
≥17.0 |
≥22.0 |
30 |
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|
28d |
MPa |
≥42.5 |
≥42.5 |
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