If $ϕ$ is the diameter of reinforceing bar, then for M15 grade concrete, the bond length used for duplicing bar in tension is approximately equal to

- 1
  
  28 $ϕ$
- 2
  
  38 $ϕ$
- 3
  
  58 $ϕ$
- 4
  
  68 $ϕ$ $ϕ$

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