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We at Sumocement manufacture this Ordinary Portland Cement in three different grades and qualities and these are :
OPC -53 GRADE:
53 Grade OPC is a higher strength cement to meet the needs of the consumer for higher strength concrete. As per BIS requirements the minimum 28 days compressive strength of 53 Grade OPC should not be less than 53 MPa. For certain specialised works, such as pre-stressed concrete and certain items of pre-cast concrete requiring consistently high strength concrete, the use of 53 grade OPC is found very useful. 53 grade OPC produces higher-grade concrete at very economical cement content. In concrete mix design, for concrete M-20 and above grades a saving of 8 to 10 % of cement may be achieved with the use of 53 grade OPC.
53 Grade OPC can be used for the following applications.
- RCC works(Preferably where grade of concrete is M-25 and above)
- Pre-cast concrete items such as paving blocks, tiles building blocks etc.
- Pre-stressed concrete components
- Runways, concrete Roads, Bridges etc.
- Runways, concrete Roads, Bridges etc.
The physical and chemical requirements of 53 Grade OPC as per BIS Requirement are given in Table below:
Physical Characteristics of 53 Grade OPC (BIS Requirement)
Is Code Finene SS (sq.m/k g Min) Soundness by Setting Time Compressive Strength
Lechatlier (mm)max Auto clave Max (%) Initial (mts) min Final (mts) Max 1 day Min Mpa 3 day Min Mpa 7 day Min Mpa 28 day Min Mpa
(IS 12269- 1987) 225 10 0.8 30 600 NS 27 37 53
Chemical Characteristics of 53 Grade OPC (BIS Requirement)
Is Code Lime Saturation Factor Alumina Ration Min Insoluble MgO (%) Sulphuric Anhydride Loss 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 4
OPC-43 GRADE
The 43 grade OPC is the most popular general-purpose cement in the country today. The production of 43 grade OPC is nearly 50% of the total production of cement in the country.
The 43 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)
- Pre-cast 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:
Physical Characteristics of 43 Grade OPC (BIS Requirement)
Is Code Finene SS (sq.m/k g Min) Soundness by Setting Time Compressive Strength
Lechatlier (mm)max Auto clave Max (%) Initial (mts) min Final (mts) Max 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 Not specified 23 33 43
Chemical Characteristics of 43 Grade OPC (BIS Requirement)
Is Code Lime Saturation Factor Alumina Ration Min Insoluble MgO (%) Sulphuric Anhydride Loss ignition (%) Max
(IS 8112 - 1989) 0.66 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
33 Grade OPC
This cement is used for general civil construction work under normal environmental conditions. The compressive strength of cement after 28 days test as per IS specification is 33 MPa. Due to low compressive strength, this cement is normally not used where high grade of concrete viz, M-20 and above is required. The availability of higher grades of OPC in the market are affecting the use of 33 grade OPC and now a days 43 grade OPC is normally used for general construction work instead of 33 grade OPC. More useful for mass concreting and plain cement concreting. Normally made to order basis. It can be used for plastering and single storeyed individual houses. The physical and chemical requirement as per BIS are given in table below:
Physical Characteristics of 33 Grade OPC (BIS Requirement)
Is Code Finene SS (sq.m/k g Min) Soundness by Setting Time Compressive Strength
Lechatlier (mm)max Auto clave Max (%) Initial (mts) min Final (mts) Max 1 day Min Mpa 3 day Min Mpa 7 day Min Mpa 28 day Min Mpa
(IS 269 - 1989) 225 10 0.8 30 600 NS 16 22 33
Chemical Characteristics of 33 Grade OPC (BIS Requirement)
Is Code Lime Saturation Factor Alumina Ration Min Insoluble MgO (%) Sulphuric Anhydride Loss ignition (%) Max
33 Grade OPC (IS 269-1989) 0.66 Min 1.02 Max 0.66 4 6 2.5% Max when C3A is 5 or less. 3% Max when C3A is greater than 5 5
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