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Concrete cover
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sathyace
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PostPosted: Thu Jul 12, 2018 8:42 pm    Post subject: Concrete cover Reply with quote

Hi all,

What should be the minimum thickness of concrete on the external face of the structural section(cover) to transfer the tension from HYSD bars of grade 500 and above?

Please provide your guidance.

Thank you,
Sathya.
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akashgondhale966@gmail.co
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PostPosted: Sun Jul 15, 2018 5:30 am    Post subject: Concrete cover Reply with quote

IS 456:2000 says provide 20mm for slab if rebar dia. is greater than 12mm. For beams it is 25 mm, for column 40 mm and for footing 50 mm min. And reduction covers are given for reduction in bar dia.


On Fri, Jul 13, 2018, 14:13 sathyace <forum@sefindia.org (forum@sefindia.org)> wrote:

Quote:
           Hi all,

What should be the minimum thickness of concrete on the external face of the structural section(cover) to transfer the tension from HYSD bars of grade 500 and above?

Please provide your guidance.

Thank you,
Sathya.
     



     


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bkkk
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PostPosted: Sun Jul 15, 2018 7:59 am    Post subject: cover thickness Reply with quote

Dear sefian,

The cover requirements are specified in IS 456. However, the exposure conditions and durability, rules the requirements.

er.venkat
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addi
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PostPosted: Sun Jul 15, 2018 6:30 pm    Post subject: Concrete cover Reply with quote

75 mm

On Fri, 13 Jul 2018, 11:42 sathyace, <forum@sefindia.org (forum@sefindia.org)> wrote:

Quote:
           Hi all,

What should be the minimum thickness of concrete on the external face of the structural section(cover) to transfer the tension from HYSD bars of grade 500 and above?

Please provide your guidance.

Thank you,
Sathya.
     



     


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Bijoy Chandra Tripathy
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PostPosted: Sun Jul 15, 2018 7:30 pm    Post subject: Concrete cover Reply with quote

Also refer to the exposure conditions.

On Sun, Jul 15, 2018 at 11:13 PM, akashgondhale966@gmail.co (akashgondhale966@gmail.co) <forum@sefindia.org (forum@sefindia.org)> wrote:
[quote]            IS 456:2000 says provide 20mm for slab if rebar dia. is greater than 12mm. For beams it is 25 mm, for column 40 mm and for footing 50 mm min. And reduction covers are given for reduction in bar dia.


On Fri, Jul 13, 2018, 14:13 sathyace forum@sefindia.org (forum@sefindia.org))> wrote:

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SATYAPAUL
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PostPosted: Sun Jul 15, 2018 11:30 pm    Post subject: Concrete cover Reply with quote

up to three times the dia of the bar,the concrete experiences stress,after that it acts as a filler.i  mean to say in case of tension in rcc slabs.bar cover specified in codes covers concrete to prevent  corrosion also.in no case the cover shall be less than 12 mm.i had to check slabs cast in 1905 and when  checked in 1977 ,it was found 90% rusted.cover was almost 12 mm over reinforcement of 12 mm dia..any  how it is engineers judgment,what cover is provided.all exposed column,sea facing i.e high exposure of  moisture shall have minimum 50 mm cover.for fire resisting cover shall conform to british or indian  code.till today technology has not been developed to produce re bars which can resist rust except epoxy  or galvanized coating. RCC structures,in my opinion must serve at least for 150 years i.e service  life.further research is need for additives in concrete which may help prevent rusting of bars. regards satya pal   On Sun, 15 Jul 2018 23:13:58 +0530 "akashgondhale966@gmail.co"  wrote >                   IS 456:2000 says provide 20mm for slab if rebar dia. is greater than 12mm. For beams it is 25  mm, for column 40 mm and for footing 50 mm min. And reduction covers are given for reduction in bar  dia. >  >  > On Fri, Jul 13, 2018, 14:13 sathyace wrote: >  >       --auto removed--

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dharmendra.k
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PostPosted: Mon Jul 16, 2018 4:30 am    Post subject: Concrete cover Reply with quote

Dear sefindian



As per my view where we need in-depth knowledge we could refer EN206-2013 edition for exposure and concrete cover with respect to life of structure.





Thanks and Regards


Dharmendraa kumar


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On Sun, Jul 15, 2018 at 11:19 PM +0530, "bkkk"  <forum@sefindia.org (forum@sefindia.org)> wrote:

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Dear sefian,

The cover requirements are specified in IS 456. However, the exposure conditions and durability, rules the requirements.

er.venkat








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saikiran gone
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PostPosted: Thu Jul 19, 2018 7:07 am    Post subject: Re: Concrete cover Reply with quote

sathyace wrote:
Hi all,

What should be the minimum thickness of concrete on the external face of the structural section(cover) to transfer the tension from HYSD bars of grade 500 and above?

Please provide your guidance.

Thank you,
Sathya.




Hi,

Refer the exposure condition, structure type (Water retaining , septic tank, or normal structure) Element type. It shall finalize the cover requirement.

For normal buildings refer the IS 456,

For other structures refer the corresponding the IS code.

With Best,
Saikiran Gone.
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Seshadri
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PostPosted: Thu Jul 19, 2018 6:30 pm    Post subject: Concrete cover Reply with quote

Satyapaul has covered many key points. Just to compliment his answer, the concrete cover thickness is decided mainly from durability angle, for the specific exposure condition - mild to . It should be minimum 20mm in mild exposure conditions (of rebar) and min 75mm in extreme exposure conditions.



S. Seshadri



On 16 July 2018 at 09:57, SATYAPAUL <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           up to three times the dia of the bar,the concrete experiences stress,after that it acts as a filler.i mean to say in case of tension in rcc slabs.bar cover specified in codes covers concrete to prevent corrosion akashgondhale966@gmail.co (akashgondhale966@gmail.co)" wrote >            IS 456:2000 says provide 20mm for slab if rebar dia. is greater than 12mm. For beams it is 25 mm, for column 40 mm and for footing 50 mm min. And reduction covers are given for reduction in bar dia. > > > On Fri, Jul 13, 2018, 14:13 sathyace wrote: > >       --auto removed--
     



     



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KABIRDASGUPTA
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PostPosted: Fri Jul 20, 2018 1:30 am    Post subject: Concrete cover Reply with quote

Fire rating is usually 2hours considered. This aspect is not mentioned here. Please refer IS:456-2000.


From: Seshadri <forum@sefindia.org>
Sent: Thursday, July 19, 2018 6:53 PM
To: general@sefindia.org
Subject: [SEFI] Re: Concrete cover  

Satyapaul has covered many key points. Just to compliment his answer, the concrete cover thickness is decided mainly from durability angle, for the specific exposure condition - mild to . It should be minimum 20mm in mild exposure conditions (of rebar) and min 75mm in extreme exposure conditions.



S. Seshadri



On 16 July 2018 at 09:57, SATYAPAUL forum@sefindia.org)> wrote:
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