Properties of normal strength Portland cement concrete
Articles > Properties of normal strength Portland cement concrete
Typical properties of normal strength Portland cement concrete:
- Density : 2240 - 2400 kg/m3 (140 - 150 lb/ft3)
- Compressive strength : 20 - 40 MPa (3000 - 6000 psi = 432 - 864 ksf)
Compressive strength of concrete (% of 28-day strength) vs age (days)
- Flexural strength : 3 - 5 MPa (400 - 700 psi = 57.6 - 100.8 ksf)
- Tensile strength : 2 - 5 MPa (300 - 700 psi = 43.2 - 100.8 ksf)
- Modulus of elasticity : 14000 - 41000 MPa (2 x 106 - 6 x 106 psi = 288000 - 864000 ksf)
The American Concrete Institute (ACI) suggests the following equation for the modulus of elasticity:
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:
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:
- Permeability : 1 x 10-10 cm/sec (2.8346 x 10-7 ft/day)
- Coefficient of thermal expansion : 10-5 oC-1 (5.5 x 10-6 oF-1)
- Drying shrinkage : 4 - 8 x 10-4
- Drying shrinkage of reinforced concrete : 2 - 3 x 10-4
- Poisson's ratio : 0.20 - 0.21
- Shear strength : 6 - 17 MPa (870 - 2465 psi)
- Specific heat : 0.75 kJ/kg K (0.18 Btu/lbm oF (kcal/kg oC))
Read also:
- Section Properties of Reinforcing Bars & Cement Types
- Structure and composition of conventional portland concrete
- Ordinary Cement use cases; Pros and Cons
- Concrete Properties
- White Portland Cement use cases; Pros and Cons
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