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Testing for Compressive Strength of Concrete Cover Blocks

 
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ajay84
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Joined: 22 Aug 2010
Posts: 3

PostPosted: Wed Sep 15, 2021 3:17 pm    Post subject: Testing for Compressive Strength of Concrete Cover Blocks Reply with quote

Hello,

In absence of specific Indian standard w.r.t Concrete Cover Blocks/ Spacers, there is ample ambiguity among manufacturers, users & testing agencies.

As per IS 516, the normal rate of loading is 140 kg/sq.cm/minute for a 150X150X150 cube. I would like to know whether a concrete cover block as small as 50cmX25cmX25cm can also be tested with similar methodology to regular cubes.

Please throw some light.

Thank you.

Regards,

Ajay.
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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 Sep 15, 2021 9:46 pm    Post subject: Re: Testing for Compressive Strength of Concrete Cover Blocks Reply with quote

Dear Er Ajay

I do not think there is a prescribed test method for concrete covers in any code, leave alone IS 456.

The cube testing procedure will not be applicable to concrete cover blocks.

Moreover, for cover Block, more that compressive strength, durability is important. You may note that even in regular concrete getting the desired strength is not that difficult. If the design mix is M25 you will easily get more than M25 in most of the cases. But getting the durability is not assured. That is the reason why fly ash and other additives were recommended.

Warm regards
Subramanian

ajay84 wrote:
Hello,

In absence of specific Indian standard w.r.t Concrete Cover Blocks/ Spacers, there is ample ambiguity among manufacturers, users & testing agencies.

As per IS 516, the normal rate of loading is 140 kg/sq.cm/minute for a 150X150X150 cube. I would like to know whether a concrete cover block as small as 50cmX25cmX25cm can also be tested with similar methodology to regular cubes.

Please throw some light.

Thank you.

Regards,

Ajay.
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vikram.jeet
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Joined: 26 Jan 2003
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PostPosted: Thu Sep 16, 2021 2:52 am    Post subject: Reply with quote

CONCRETE cover blocks

For Building construction works ,their  strength is not any issue , nor it's permeability. But for water retaining structures , cover blocks cover the reinforcement at locations these are placed during execution , and needs to be durable / impermeable to protect initiation of  spot rusting of reinforcement.

Generally these are cast with richer mix than parent concrete .
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