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Quality control Standards in India

  • 1.  Quality control Standards in India

    Posted 04-16-2025 08:15 AM
    Hi Arth
     You have made a good point. The standards are not always followed in the field. When I was working for the government, I concluded that 60 percent of the executive engineers at all levels have little to no idea about characteristic compressive strength. They tend to have a fixed number in mind that is sure to be safe and that must be reached. So, consult the respective authorities before making any decision. Hope this answers your question.
    Regards,
    Prem Janapala
    Project Manage/Engineer.

    On Fri, Mar 28, 2025 at 9:00 PM Arth Patel via ASCE Collaborate <Mail@...> wrote:
    According to IS:10262 (2009), f'_ck = f_ck + 1.65s where, f'_ck = Target Mean Compressive strength at 28 days in N/mm2 f_ck = Characteristic...
    American Society of Civil Engineers

    India Section

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    Re: Quality control Standards in India
    Reply to Group Online Reply to Group
    Mar 28, 2025 11:28 AM
    Arth Patel

    According to IS:10262 (2009),
    f'_ck = f_ck + 1.65s

    where,

    f'_ck = Target Mean Compressive strength at 28 days in N/mm2 
    f_ck = Characteristic Compressive strength at 28 days in N/mm2 (In this case is 40 N/mm2 for M40 concrete)
    s = Standard deviation N/mm2

    Assuming value of standard deviation (s) 

      • Let us assume that project doesn't has proper site control check.
      • Using table 1 (Pg. 2), s = 5 + 1 = 6 N/mm2

     f'_ck = 40 + 1.65(6) = 49.9 N/mm2

    • Maybe due to usual site practice, value of 52 N/mm2 is considered as target mean compressive strength (anyways on conservative side).

    If you are provided with proper data then please verify same using actual standard deviation (s).



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