GATE Civil Engineering
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The target mean strength $f_{cm}$ for concrete mix design obtained from the characteristic strength $f_{ck}$ and standard deviation $\sigma$, as defined in $IS:456-2000$, is

  1. $f_{ck}+1.35 \sigma$
  2. $f_{ck}+1.45 \sigma$
  3. $f_{ck}+1.55 \sigma$
  4. $f_{ck}+1.65 \sigma$
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