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Civil Engineering QUESTION #6599
Question 1
When using Grade 40 or Grade 50 steel reinforcement, the minimum steel ratio required by ACI 318 to control temperature and shrinkage cracking in slabs is:
  • 0.10%
  • 0.15%
  • 0.18%
  • 0.20%✔️
Correct Answer Explanation
Per ACI 318, for Grade 40 or 50 deformed bars, the minimum temperature and shrinkage steel ratio \(\rho_{min} = 0.0020\) (i.e. 0.20%) of the gross cross-sectional area.