Concrete grades

EC2(1) uses the cylinder strength, fck, to define the concrete strength in design equations, although the cube strength may be used for control purposes. The grade designations specify both cylinder and cube strengths in the form C cylinder strength/cube strength, for example C25/30.

It may occasionally be necessary to use cube strengths which do not exactly correspond to one of the specified grades. In such instances a relationship is required between cylinder and cube strength in order to obtain an appropriate value for f The relationship implicit in EC2 and ENV 206(6) is given in Figure 13.1.

Concrete Cube Cylinder Strength
Figure 13.1 Relationship between cube and cylinder strength of concrete
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