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Indicative strength class

The indicative (minimum) strength class of the concrete depends on the exposure class, that is defined in the table 4.1 of EN 1992-1-1. The indicative strength class is given in the table E.1N:

Exposure class

Indicative strength class

X0

C12/15

XC1

C20/25

XC2

C25/30

XC3

C30/37

XC4

C30/37

XD1

C30/37

XD2

C30/37

XD3

C35/45

XS1

C30/37

XS2

C35/45

XS3

C35/45

XF1

C30/37 (C25/30)

XF2

C25/30 (aeration min.4%)

XF3

C30/37 (C25/30 aeration min.4%)

XF4

C30/37 (aeration min.4%)

XA1

C30/37 (C25/30)

XA2

C30/37

XA3

C35/45

Note: values in brackets are valid for the Czech republic (table E1.CZ). The higher strength class shall be used for aeration lower than the minimum value.

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