# Secant modulus of elasticity of concrete at an age of `t` days, `E`_{cm}(t)

_{cm}(t)

## Eurocode 2 part 1-1: Design of concrete structures 3.1.3 (3)

Variation of the modulus of elasticity with time can be estimated by:

E = (_{cm}(t)f / _{cm}(t)f)_{cm}^{0,3} E _{cm} | (3.5) |

where:

`E`_{cm}(t)- is the secant modulus of elasticity of concrete at an age of
`t`days `E`_{cm}- is the secant modulus of elasticity of concrete at 28 days
`f`_{cm}(t)- is the mean concrete compressive strength at an age
`t`days `f`_{cm}- is the mean compressive strength at 28 days according to Table 3.1.

This application calculates
the modulus of elasticity `E _{cm}(t)`
from your inputs.
Intermediate results will also be given.