Concrete Modulus of Elasticity Ec (ACI 318-19 19.2.2)
Ec = wc^1.5 x 33 x sqrt(f'c) psi (ACI 19.2.2.1), the stiffness behind every deflection, drift, and short-column calculation; the normalweight shortcut is 57000 x sqrt(f'c). 4000 psi at 145 pcf -> 3,644,000 psi (3644 ksi); a 115 pcf lightweight deck is only ~70% as stiff. A design aid; the engineer of record's stamped design governs.
Formula and source
Ec = wc^1.5 x 33 x sqrt(f'c) psi (90 <= wc <= 160); normalweight shortcut Ec = 57000 x sqrt(f'c).
The ACI 318-19 19.2.2.1 modulus of elasticity of concrete, by name.
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