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33,43 & 53 GRADE OPC CEMENT.
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P.K.Mallick
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PostPosted: Mon Feb 16, 2009 4:38 pm    Post subject: 33,43 & 53 GRADE OPC CEMENT. Reply with quote

What factors contribute towards higher compressive strength as we move from 33 grade OPC. to 53 grade OPC ? Is the fineness of cement is the only factor or some other factors contribute towards higher compressive strength for higher Grade of OPC ?
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Dr. N. Subramanian
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PostPosted: Tue Feb 17, 2009 4:11 am    Post subject: 33,43 & 53 GRADE OPC CEMENT. Reply with quote

Dear Mr. Mallick,

I am not a scientist on cement. Hope my friend Mr. Rajamane of SERC can throw some light on the question raised by you.

Anyway, the enclosed paper may be of interest to you.

Best Wishes
Subramanian





From: P.K.Mallick <forum@sefindia.org>
To: general@sefindia.org
Sent: Monday, February 16, 2009 11:38:36 AM
Subject: [SEFI] 33,43 & 53 GRADE OPC CEMENT.

     What factors contribute towards higher compressive strength as we move from 33 grade OPC. to 53 grade OPC ? Is the fineness of cement is the only factor or some other factors contribute towards higher compressive strength for higher Grade of OPC ?
     


P.K.Mallick
munamallick@yahoo.co.in (munamallick@yahoo.co.in)
mallick.pravatkumar@gmail.com (mallick.pravatkumar@gmail.com)
http://360.yahoo.com/munamallick

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P.K.Mallick
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PostPosted: Tue Feb 17, 2009 6:35 am    Post subject: Reply with quote

I would request respected Dr Manmohan Kalgal to address this issue.
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PostPosted: Tue Feb 17, 2009 6:42 am    Post subject: Re: 33,43 & 53 GRADE OPC CEMENT. Reply with quote

drnsmani wrote:
Dear Mr. Mallick,

I am not a scientist on cement. Hope my friend Mr. Rajamane of SERC can throw some light on the question raised by you.

Anyway, the enclosed paper may be of interest to you.

Best Wishes
Subramanian





From: P.K.Mallick <forum>
To: general@sefindia.org
Sent: Monday, February 16, 2009 11:38:36 AM
Subject: [SEFI] 33,43 & 53 GRADE OPC CEMENT.

     What factors contribute towards higher compressive strength as we move from 33 grade OPC. to 53 grade OPC ? Is the fineness of cement is the only factor or some other factors contribute towards higher compressive strength for higher Grade of OPC ?
     


P.K.Mallick
munamallick@yahoo.co.in (munamallick@yahoo.co.in)
mallick.pravatkumar@gmail.com (mallick.pravatkumar@gmail.com)
http://360.yahoo.com/munamallick

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Respected Subramanian Sir,
Please get some feedback on this issue from your friend, Mr. Rajamane of SERC for benefit of all.

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rajmane
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PostPosted: Tue Feb 17, 2009 4:04 pm    Post subject: 33,43 & 53 GRADE OPC CEMENT. Reply with quote

17th Feb 2009 10 pm
This is a very vast, important, but very delicate topic/subject. Many points are involved. I would like to write my response after we listen to different views on this. I hope my good friend Dr NS would agree to wait for my view. The idea is to receive the maximum number of views/queries/issues and then make up a detailed technical write up.

N P Rajamane, SERC


drnsmani wrote:
[quote]          Dear Mr. Mallick,

I am not a scientist on cement. Hope my friend Mr. Rajamane of SERC can throw some light on the question raised by you.

Anyway, the enclosed paper may be of interest to you.

Best Wishes
Subramanian





From: P.K.Mallick
To: general@sefindia.org (general@sefindia.org)
Sent: Monday, February 16, 2009 11:38:36 AM
Subject: [SEFI] 33,43 & 53 GRADE OPC CEMENT.

     What factors contribute towards higher compressive strength as we move from 33 grade OPC. to 53 grade OPC ? Is the fineness of cement is the only factor or some other factors contribute towards higher compressive strength for higher Grade of OPC ?
     


P.K.Mallick
munamallick@yahoo.co.in (munamallick@yahoo.co.in) (munamallick@yahoo.co.in (munamallick@yahoo.co.in))
mallick.pravatkumar@gmail.com (mallick.pravatkumar@gmail.com) (mallick.pravatkumar@gmail.com (mallick.pravatkumar@gmail.com))
http://360.yahoo.com/munamallick
     



     
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kjagannadharao
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PostPosted: Wed Feb 18, 2009 10:17 am    Post subject: 33,43 & 53 GRADE OPC CEMENT. Reply with quote

Dear Er.Mallik,

It is only the fineness that contributes to the higher strength at 28 days age as the grade of cement increases . The reason for this being the higher surface area in higher grade cements which in turn increases the rate of reaction (hydration).

Jagannadha Rao

--- On Mon, 16/2/09, P.K.Mallick <forum@sefindia.org> wrote:

Quote:
From: P.K.Mallick <forum@sefindia.org>
Subject: [SEFI] 33,43 & 53 GRADE OPC CEMENT.
To: general@sefindia.org
Date: Monday, 16 February, 2009, 10:08 PM

What factors contribute towards higher compressive strength as we move from 33 grade OPC. to 53 grade OPC ? Is the fineness of cement is the only factor or some other factors contribute towards higher compressive strength for higher Grade of OPC ?



P.K.Mallick
munamallick@yahoo.co.in (munamallick@yahoo.co.in)
mallick.pravatkumar@gmail.com (mallick.pravatkumar@gmail.com)
http://360.yahoo.com/munamallick






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P.K.Mallick
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PostPosted: Thu Feb 19, 2009 5:54 pm    Post subject: Reply with quote

Respected Jagannadha Rao Sir,
It has been alleged that Cement manufacturers do not prefer to increase the strength of cement by improving the fineness of cement due to high cost involved in grinding clinker.
They resort to some other method to increase the compressive strength of cement.
Warm Regards.

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P.K.Mallick
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PostPosted: Fri Feb 20, 2009 5:01 pm    Post subject: Reply with quote

IS:12269(SPECIFICATION FOR 53 GRADE OPC  CEMENT)
IS:8112(SPECIFICATION FOR 43 GRADE OPC CEMENT)
IS:269(SPECIFICATION FOR 33 GRADE OPC CEMENT)
All these codes specify that the specific surface of cement shall not be less than 225 sqm/kg.
Hence codal provisions do not differentiate 33,43 & 53 grade cement by fineness.
Which factor(s) is(are) then responsible for higher strength as we move from 33 Grade OPC to 53 Grade OPC?

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PostPosted: Fri Feb 20, 2009 5:29 pm    Post subject: Reply with quote

C3S  in cement contributes most to the strength development during the first four weeks and C2S influences the gain in strength from 4 weeks onwards. Hence high percentage of C3S contributes for high early strength. Hence it could be possible that percentage of C3S increases as we move from 33 Grade cement to 43 Grade cement.
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parikshit_pandya
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PostPosted: Sat Feb 21, 2009 6:54 am    Post subject: 33,43 & 53 GRADE OPC CEMENT. Reply with quote

other factors are C3S(tri calcium silicate)which is responsible for strength at early age and C2S(Di calcium silicate) which is responsible for strength at later age.  As we move from 33 to 53, the % of C3S is increased and C2s is decreased.  This is my views, hope u will come on some conclusion


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   On Sat, 21 Feb 2009 06:05:43 +0530 wrote >IS:12269(SPECIFICATION FOR 53 GRADE OPC  CEMENT) >IS:8112(SPECIFICATION FOR 43 GRADE OPC CEMENT) >IS:269(SPECIFICATION FOR 33 GRADE OPC CEMENT) >
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