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Properties of normal strength Portland cement concrete

Articles > Properties of normal strength Portland cement concrete

Typical properties of normal strength Portland cement concrete:

Compressive strength of concrete (% of 28-day strength) vs age (days)

The American Concrete Institute (ACI) suggests the following equation for the modulus of elasticity:

E_{c} = 33omega _{c}^{1.5}sqrt{f'_{c}}; (psi)

where​

wc = weight of concrete (pounds per cubic foot)

f'c = compressive strength of concrete at 28 days (psi)

 AASHTO Load and Resistance Factor Design Manual, or "LRFD"  suggests the following equation:

E_{c} = 33000K_{1}omega _{c}^{1.5}sqrt{f'_{c}}; (ksi)

where​

K1 = correction factor for aggregate source (taken as 1.0 unless determined otherwise)

wc = weight of concrete (pounds per cubic foot (pcf))

f'c = compressive strength of concrete at 28 days (psi)

A handy approximate equation:

E_{c} = 1820sqrt{f'_{c}}; (ksi)


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