# Properties of concrete - modulus of elasticity (AASHTO)

## Description

The modulus of elasticity of concrete is a function of the modulus of elasticity of the aggregates and the cement matrix and their relative proportions. The modulus of elasticity of concrete is relatively constant at low stress levels but starts decreasing at higher stress levels as matrix cracking develops. The elastic modulus of the hardened paste may be in the order of 10-30 GPa and aggregates about 45 to 85 GPa. The concrete composite is then in the range of 30 to 50 GPa.

The modulus of elasticity of concrete according to the publication used by structural bridge engineers is the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design Manual.

Related formulas## Variables

E_{c} | modulus of elasticity of concrete (dimensionless) |

K_{1} | correction factor (dimensionless) |

w_{c} | weight of concrete (dimensionless) |

f_{c} | compressive strength of concrete at 28 days (dimensionless) |