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Civil Engineering QUESTION #6595
Question 1
For normal-weight concrete with \(f'_c = 3000\,\text{psi}\), the modulus of elasticity \(E_c\) (ACI formula) is approximately:
  • 3.15 × 10⁶ psi✔️
  • 3.32 × 10⁶ psi
  • 3.48 × 10⁶ psi
  • 3.65 × 10⁶ psi
Correct Answer Explanation
ACI 318 formula: \(E_c = 57{,}000\sqrt{f'_c}\,\text{(psi)}\). \(E_c = 57{,}000\sqrt{3000} = 57{,}000 \times 54.77 \approx 3{,}122{,}000\,\text{psi} \approx 3.12 \times 10^6\,\text{psi}\), closest to option (a).