# Design compressive strength of concrete: the coefficient `α`_{cc}

_{cc}

## Eurocode 2 part 2: Design of concrete bridge structures 3.1.6 (101)P

The value of the design compressive strength is defined as:

f = _{cd}α _{cc}f / _{ck}γ_{C} | (3.15) |

where:

`γ`_{C}- is the partial safety factor for concrete
`α`_{cc}- is the coefficient taking account of long term effects on the compressive strength and of unfavourable effects resulting from the way the load is applied.

## Recommendation

The value of `α _{cc}` for the calculation of the design compressive strength of concrete should lie between 0,8 and 1,0. The recommended value is 0,85.