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ACCEPTANCE CRITERIA OF CONCRETE
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P.K.Mallick
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PostPosted: Sun Feb 20, 2011 3:44 pm    Post subject: ACCEPTANCE CRITERIA OF CONCRETE Reply with quote

Please read the attached document and solve the issues


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vikram.jeet
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PostPosted: Mon Feb 21, 2011 7:50 am    Post subject: ACCEPTANCE CRITERIA OF CONCRETE Reply with quote

Respected PK Mallick sir,

It is encouraging to see your posting on sefi after long gap.
Kindly keep guiding on sefi whenever time permit.

with kind regards

vikramjeet
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P.K.Mallick
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PostPosted: Mon Feb 21, 2011 5:31 pm    Post subject: Reply with quote

No response!!!
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Arvind Kumar Jaiswal
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PostPosted: Tue Feb 22, 2011 4:48 am    Post subject: Reply with quote

P.K.Mallick wrote:
No response!!!



Dear Er P K Mallick,

I will post response, perhaps tomorrow or day after tomorrow.

with warm regards.


Arvind Jaiswal
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PostPosted: Tue Feb 22, 2011 5:25 am    Post subject: ACCEPTANCE CRITERIA OF CONCRETE Reply with quote

Tuesday, February 22, 2011<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

Dear all



Sub : ACCEPTANCE CRITERIA OF CONCRETE

Ref : Write up by Dr Mullick



A. We must see Clause 16 for ACCEPTANCE CRITERIA OF CONCRETE. Clause 16.1 deals with  Compressive Strength and Clause 16.2 with Flexural Strength. Hence, the strength value of  0.3

N/mm2 appearing in Clause 16.2 should not be used for compressive strength. Hence following para needs modification:



鈥淗ence if we look into Acceptance Criteria from both compressive strength as well as flexural strength point view, it can be concluded that

(a) Mean compressive strength of four consecutive test results must be more than equal to characteristic strength of concrete plus 3N/mm2.

(b) Any test results is not less than specified characteristic strength minus 0.3N/mm2.



B. We must use Clause 16.1 and Table 11 for ACCEPTANCE CRITERIA OF CONCRETE for Compressive Strength. Hence, for M25 grade concrete,



路 Individual test result shall not be less than fck-4 i.e. 25-4=21 MPa.



(Col No 3 Table 11 of IS code gives a value of 4 and not 3 in the above computation for M25 grade.)



路 Mean compressive strength of four consecutive test results for M25 grade concretes must be more than fck+0.825*characteristic strength or fck + 4 N/mm2



(It would be incorrect to check for 25+3=28 MPa and 25-0.3=24.7, as mentioned in the write up. Col No 2 Table 11 of IS code gives a value of 4 and not 3 in the above computation for M25 grade)



Thanking you



Yours sincerely

<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" />

N P Rajamane

[Secretary, Indian Concrete Institute, Tamil Nadu Centre, Retired Head, Advanced Materials Laboratory, CSIR-Structural Engineering Research Centre]



Head, Centre for Advanced Concrete research (CACR), University Office Building III Floor, SRM University, Kattankulathur - 603203 (Near Chennai), Tamil Nadu Mob 9840076821,

Email :rajamanenp@yahoo.co.uk

--- On Sun, 20/2/11, P.K.Mallick <forum@sefindia.org> wrote:
Quote:

From: P.K.Mallick <forum@sefindia.org>
Subject: [SEFI] ACCEPTANCE CRITERIA OF CONCRETE
To: general@sefindia.org
Date: Sunday, 20 February, 2011, 9:14 PM

Please read the attached document and solve the issues





Download Attachments:
Acceptance of Criteria of Concrete.doc




Posted via Email



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Dr. N. Subramanian
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PostPosted: Tue Feb 22, 2011 3:58 pm    Post subject: Re: ACCEPTANCE CRITERIA OF CONCRETE Reply with quote

Dear Dr Rajamane,

Happy to note that you have joined as Head of the Centre for Advanced Concrete research (CACR),  SRM University, Kattankulathur, Chennai.

I wish you all the best in this new assignment and I am sure with your vast experience and credentials, you will take CACR to greater heights.

Best regards,
Subramanian
rajmane wrote:
Tuesday, February 22, 2011<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

Dear all



Sub : ACCEPTANCE CRITERIA OF CONCRETE

Ref : Write up by Dr Mullick



A. We must see Clause 16 for ACCEPTANCE CRITERIA OF CONCRETE. Clause 16.1 deals with  Compressive Strength and Clause 16.2 with Flexural Strength. Hence, the strength value of  0.3

N/mm2 appearing in Clause 16.2 should not be used for compressive strength. Hence following para needs modification:



鈥淗ence if we look into Acceptance Criteria from both compressive strength as well as flexural strength point view, it can be concluded that

(a) Mean compressive strength of four consecutive test results must be more than equal to characteristic strength of concrete plus 3N/mm2.

(b) Any test results is not less than specified characteristic strength minus 0.3N/mm2.



B. We must use Clause 16.1 and Table 11 for ACCEPTANCE CRITERIA OF CONCRETE for Compressive Strength. Hence, for M25 grade concrete,



路 Individual test result shall not be less than fck-4 i.e. 25-4=21 MPa.



(Col No 3 Table 11 of IS code gives a value of 4 and not 3 in the above computation for M25 grade.)



路 Mean compressive strength of four consecutive test results for M25 grade concretes must be more than fck+0.825*characteristic strength or fck + 4 N/mm2



(It would be incorrect to check for 25+3=28 MPa and 25-0.3=24.7, as mentioned in the write up. Col No 2 Table 11 of IS code gives a value of 4 and not 3 in the above computation for M25 grade)



Thanking you



Yours sincerely

<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" />

N P Rajamane

[Secretary, Indian Concrete Institute, Tamil Nadu Centre, Retired Head, Advanced Materials Laboratory, CSIR-Structural Engineering Research Centre]



Head, Centre for Advanced Concrete research (CACR), University Office Building III Floor, SRM University, Kattankulathur - 603203 (Near Chennai), Tamil Nadu Mob 9840076821,

Email :rajamanenp@yahoo.co.uk

--- On Sun, 20/2/11, P.K.Mallick <forum@sefindia.org> wrote:
Quote:

From: P.K.Mallick <forum@sefindia.org>
Subject: [SEFI] ACCEPTANCE CRITERIA OF CONCRETE
To: general@sefindia.org
Date: Sunday, 20 February, 2011, 9:14 PM

Please read the attached document and solve the issues





Download Attachments:
Acceptance of Criteria of Concrete.doc




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P.K.Mallick
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PostPosted: Tue Feb 22, 2011 4:03 pm    Post subject: Re: ACCEPTANCE CRITERIA OF CONCRETE Reply with quote

rajmane wrote:
Tuesday, February 22, 2011<xml>

Dear all



Sub : ACCEPTANCE CRITERIA OF CONCRETE

Ref : Write up by Dr Mullick



A. We must see Clause 16 for ACCEPTANCE CRITERIA OF CONCRETE. Clause 16.1 deals with  Compressive Strength and Clause 16.2 with Flexural Strength. Hence, the strength value of  0.3

N/mm2 appearing in Clause 16.2 should not be used for compressive strength. Hence following para needs modification:



鈥淗ence if we look into Acceptance Criteria from both compressive strength as well as flexural strength point view, it can be concluded that

(a) Mean compressive strength of four consecutive test results must be more than equal to characteristic strength of concrete plus 3N/mm2.

(b) Any test results is not less than specified characteristic strength minus 0.3N/mm2.



B. We must use Clause 16.1 and Table 11 for ACCEPTANCE CRITERIA OF CONCRETE for Compressive Strength. Hence, for M25 grade concrete,



路 Individual test result shall not be less than fck-4 i.e. 25-4=21 MPa.



(Col No 3 Table 11 of IS code gives a value of 4 and not 3 in the above computation for M25 grade.)



路 Mean compressive strength of four consecutive test results for M25 grade concretes must be more than fck+0.825*characteristic strength or fck + 4 N/mm2



(It would be incorrect to check for 25+3=28 MPa and 25-0.3=24.7, as mentioned in the write up. Col No 2 Table 11 of IS code gives a value of 4 and not 3 in the above computation for M25 grade)



Thanking you



Yours sincerely

<xml>

N P Rajamane

[Secretary, Indian Concrete Institute, Tamil Nadu Centre, Retired Head, Advanced Materials Laboratory, CSIR-Structural Engineering Research Centre]



Head, Centre for Advanced Concrete research (CACR), University Office Building III Floor, SRM University, Kattankulathur - 603203 (Near Chennai), Tamil Nadu Mob 9840076821,

Email :rajamanenp@yahoo.co.uk

--- On Sun, 20/2/11, P.K.Mallick <forum> wrote:
Quote:

From: P.K.Mallick <forum>
Subject: [SEFI] ACCEPTANCE CRITERIA OF CONCRETE
To: general@sefindia.org
Date: Sunday, 20 February, 2011, 9:14 PM

Please read the attached document and solve the issues





Download Attachments:
Acceptance of Criteria of Concrete.doc




Posted via Email



Respected Rajamane Sir,
There is an amendment to IS:456-2000 which says
Substitute "Fck+3" for "Fck+4) against "M-20 and above"
Substitute "Fck-3" for "Fck-4" against "M-20 and above"

Secondly ,kindly do not call me "Dr" as I possess no qualification for that.
Warm Regards.

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mks
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PostPosted: Tue Feb 22, 2011 6:41 pm    Post subject: Re: ACCEPTANCE CRITERIA OF CONCRETE Reply with quote

Respected Mallick Sir and Rajmane Sir,

I Agreed with Mallick Sir, that  there  is an amendment vide amendment No -3 August 2007  to IS:456-2000 which says
Substitute "Fck+3" for "Fck+4) against "M-20 and above"
Substitute "Fck-3" for "Fck-4" against "M-20 and above"

Secondly I also agreed with Rajmane Sir, that  We must see Clause 16 for ACCEPTANCE CRITERIA OF CONCRETE. Clause 16.1 deals with  Compressive Strength and Clause 16.2 with Flexural Strength. Hence, the strength value of  0.3 N/mm^2

I think there was some error  while printing the clause 15.1.1 of IS:456 -2000 which states that  揑n all cases, the 28 days compressive strength specified in Table2 shall alone be the criterion for acceptance or rejection of concrete  which has been corrected by adding 搃n accordance with 16 at the end of the clause vide  amendment No -3 August 2007  to IS:456-2000

Now the clause should be read as  In order to get relatively quicker idea  -----------------------------------------------------  In all cases, the 28 days compressive strength specified in Table2 shall alone be the criterion for acceptance or rejection of concrete  in accordance with 16.

The  揘on-overlapping  means that the  test results of one Group should not be taken in the another Group. For example,  if there are 50 nos of  test result  ie  Sl No 01  to 50  for a concrete work.  And now if we want to make 5 Groups each consisting 10 test results. Then the Group no 1 should contain  those 10 results (say Sl No 01 to 10) and the Group No 2 should not contain the results of Group No 1 (ie  Sl No 05 to 15)  and so on.


I think the Acceptance Criteria  formulated in IS:456- 2000 is simplified Acceptance Criteria  and has been formulated keeping in view of developments in this field.

Comments from senior members are highly appreciated.

Mithilesh




P.K.Mallick wrote:
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PostPosted: Thu Feb 24, 2011 3:12 am    Post subject: Reply with quote

Respected All
I am sincerely looking for a solution. Please spare some time on the issue.

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PostPosted: Thu Feb 24, 2011 5:45 am    Post subject: Re: ACCEPTANCE CRITERIA OF CONCRETE Reply with quote

Dear Er Mithilesh,

Yes. These are indicated in the Amendment. Hence I hope that the doubts of Er Mallick are clarified as "In all cases, the 28 days compressive strength specified in Table2 shall alone be the criterion for acceptance or rejection of concrete in accordance with 16"

Regards,
Subramanian
mks wrote:
Respected Mallick Sir and Rajmane Sir,

I Agreed with Mallick Sir, that  there  is an amendment vide amendment No -3 August 2007  to IS:456-2000 which says
Substitute "Fck+3" for "Fck+4) against "M-20 and above"
Substitute "Fck-3" for "Fck-4" against "M-20 and above"

Secondly I also agreed with Rajmane Sir, that  We must see Clause 16 for ACCEPTANCE CRITERIA OF CONCRETE. Clause 16.1 deals with  Compressive Strength and Clause 16.2 with Flexural Strength. Hence, the strength value of  0.3 N/mm^2

I think there was some error  while printing the clause 15.1.1 of IS:456 -2000 which states that  揑n all cases, the 28 days compressive strength specified in Table2 shall alone be the criterion for acceptance or rejection of concrete  which has been corrected by adding 搃n accordance with 16 at the end of the clause vide  amendment No -3 August 2007  to IS:456-2000

Now the clause should be read as  In order to get relatively quicker idea  -----------------------------------------------------  In all cases, the 28 days compressive strength specified in Table2 shall alone be the criterion for acceptance or rejection of concrete  in accordance with 16.

The  揘on-overlapping  means that the  test results of one Group should not be taken in the another Group. For example,  if there are 50 nos of  test result  ie  Sl No 01  to 50  for a concrete work.  And now if we want to make 5 Groups each consisting 10 test results. Then the Group no 1 should contain  those 10 results (say Sl No 01 to 10) and the Group No 2 should not contain the results of Group No 1 (ie  Sl No 05 to 15)  and so on.


I think the Acceptance Criteria  formulated in IS:456- 2000 is simplified Acceptance Criteria  and has been formulated keeping in view of developments in this field.

Comments from senior members are highly appreciated.

Mithilesh




P.K.Mallick wrote:
Please read the attached document and solve the issues
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