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Regarding Concrete acceptance criteria

 
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piyush.civilengg
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Joined: 09 Aug 2018
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PostPosted: Thu Aug 09, 2018 3:07 am    Post subject: Regarding Concrete acceptance criteria Reply with quote

Dear All,

     Suppose Grade of Concrete is M30,By chance the cube result become fail,so directly go with Core the measure the actual strength of the concrete member now, my question is which strength i have to considered for acceptance.

   As per IS 456 Table 11 Characteristic comprehensive strength Compliance requirement ( Page No. 44)

For M30 grade       

1. Fck+0.825 x standard deviation
2. Fck + 4

Which ever is greater with condition individual test results is greater than or equal to Fck


As per IS 456 above clause for M30 grade of concrete it's
interpretation for




Strength of Concrete member is greater than or equal to 34 N/mm2 and individual test results is greater than or equal to 30 N/mm2.



Please give your expert opinion on the above subject.




Regards,
Piyush Parmar
940 949 2827
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HITESHRPATEL_1989
SEFI Member
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Joined: 07 Dec 2017
Posts: 1

PostPosted: Thu Aug 09, 2018 9:30 am    Post subject: Regarding Concrete acceptance criteria Reply with quote

Hi,  Here is Mr. Hitesh Patel,
Firstly if I am not wrong, correct Fck+4 with Fck+3 for mean of group of four non-consecutive and Fck-3 for individual test result  for M20 and more as per riv-4,  amendment-2.
To accept M30 grade concrete, mean cube strength must be 33 and more with individual test result not less than 27.
To accept M30 grade concrete, mean core strength must be more than 0.85x30 with individual test result more than 0.75x30.


Hitesh r. Patel.



On Thu, Aug 9, 2018 at 8:37 AM, piyush.civilengg <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           Dear All,

     Suppose Grade of Concrete is M30,By chance the cube result become fail,so directly go with Core the measure the actual strength of the concrete member now, my question is which strength i have to considered for acceptance.

As per IS 456 Table 11 Characteristic comprehensive strength Compliance requirement ( Page No. 44)

For M30 grade      

1. Fck+0.825 x standard deviation
2. Fck + 4

Which ever is greater with condition individual test results is greater than or equal to Fck


As per IS 456 above clause for M30 grade of concrete it's
interpretation for




Strength of Concrete member is greater than or equal to 34 N/mm2 and individual test results is greater than or equal to 30 N/mm2.


Please give your expert opinion on the above subject.




Regards,
Piyush Parmar
940 949 2827
     



     


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