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How to reduce stripping time for shuttering.

 
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sagarhuddar
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Joined: 28 Jun 2011
Posts: 12

PostPosted: Wed Aug 03, 2011 5:28 am    Post subject: How to reduce stripping time for shuttering. Reply with quote

dear all,
I want to know' how to reduce the deshuttering time. I think there are some admixtures also, but still using higher grade cement, we can reduce the deshuttering time..Kindly help me on this.
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Dr. N. Subramanian
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Joined: 21 Feb 2008
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Location: Gaithersburg, MD, U.S.A.

PostPosted: Wed Aug 03, 2011 2:17 pm    Post subject: Re: How to reduce stripping time for shuttering. Reply with quote

Dear Er Huddar,

There are some formwork techniques (using drop-head attachments) which can be used to release the shuttering early for slabs. I remember Mr George of SERC did some work on that long ago.

Non-Chloride hardening accelerators will also help in early deshuttering. But in my opinion, early deshuttering is bad for concrete. It is like giving some medicines to a child to grow quickly so that he/she can lift heavy weights.

I suggest all of you to read the paper by Dr Jayasree, Prof. Manu Santhanam and Prof Ravindra Gettu of IITM, in the July 2011 issue of ICJ, which talks about Cement-Superplasticiser compatibility issues and Challenges. You can not simply use any chemical in concrete without knowing its implications on the long-term effects!

Best wishes
NS
sagarhuddar wrote:
dear all,
I want to know' how to reduce the deshuttering time. I think there are some admixtures also, but still using higher grade cement, we can reduce the deshuttering time..Kindly help me on this.
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sagarhuddar
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Joined: 28 Jun 2011
Posts: 12

PostPosted: Fri Aug 05, 2011 6:06 am    Post subject: Reply with quote

I agree with you sir. We have to give the required amount of time for concrete to get the strength. I heard that by using higher grade of cement we can also reduce the stripping time. Is it true?
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Dr. N. Subramanian
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Joined: 21 Feb 2008
Posts: 5327
Location: Gaithersburg, MD, U.S.A.

PostPosted: Fri Aug 05, 2011 2:37 pm    Post subject: Reply with quote

sagarhuddar wrote:
I agree with you sir. We have to give the required amount of time for concrete to get the strength. I heard that by using higher grade of cement we can also reduce the stripping time. Is it true?


Dear Er Sagar Huddar,

True. It is because they are designed to give high early strength. But you have to be careful while using them as they have more shrinkage stresses and have to be cured properly immediately after setting.

Best wishes
NS
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sagarhuddar
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PostPosted: Sat Aug 06, 2011 4:49 am    Post subject: Reply with quote

Dear sir,
Thank you for ur reply...
Can you tell me,Is there any guide rule for stripping time based on grade of cement.


Thanks & Regards
Sagar
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atul_123
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Joined: 29 May 2009
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Location: VADODARA, GUJARAT, INDIA.

PostPosted: Tue Aug 30, 2011 11:41 am    Post subject: Reply with quote

sagarhuddar wrote:
Dear sir,
Thank you for ur reply...
Can you tell me,Is there any guide rule for stripping time based on grade of cement.


Thanks & Regards
Sagar




i am pt design engineer and i am designing pt slab and beam in that i am using min. M30 grade of concrete and after getting concrete strength equal to M20 ( generally it is achieved in 3-4 days after concreting ) we are doing stressing of pt tendon of slab and beam and after that shuttering is removed only need to provide one bar at a distance of 2 to 2.5 feet in beam.
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