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Characteristic |
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42.5 Grade OPC. |
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The 42.5 grade OPC is the most popular general-purpose cement in the country today. The production of 42.5 grade OPC is nearly 50% of the total production of cement in the country.
The 42.5 grade OPC can be used for following applications:
• General Civil Engineering construction work
• RCC works(preferably where grade of concrete is up to M-30)
• Precast items such as blocks, tiles, pipes etc
• Asbestos products such as sheets and pipes
• Non-structural works such as plastering, flooring etc.
The compressive strength of cement when tested as per IS code shall be minimum 43 MPa. The physical and chemical properties of this cement are given in the table:
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| PHYSICAL CHARACTERISTICS OF 42.5 GRADE OPC |
| IS Code |
Fineness (sq.m/kg)min |
Soundness by |
Setting Time |
Compressive Strength |
| Lechatlier (mm) max |
Auto clave
Max (%) |
Initial (mts) min |
Final
(mts) |
1 day Min Mpa |
3 day Min Mpa |
7 day Min Mpa |
28 day Min Mpa |
| (IS 8112-1989) |
225 |
10 |
0.8 |
30 |
600
Specified |
NS |
23 |
33 |
43 |
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| CHEMICAL CHARACTERISTICS OF 42.5 GRADE OPC |
| IS Code |
Lime Saturation Factor |
Alumina ratio Min. |
Insoluble Residue (%) Max |
MgO (%) Max. |
Sulphuric anhydride |
Loss on Ignition (%) Max |
| (IS 12269-1987) |
0.8 Min 1.02 Max |
0.66 |
3 |
6 |
2.5% Max when C3A is 5 or less.
3% Max when C3A is greater than 5 |
5 |
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