Basic Value According to [4], Table 3.2, or Annex B, Eq. (B.11)

ε_{cd, 0} = 0.85 \cdot [(220 + 110 \cdot α_{ds 1}) \cdot \exp (- α_{ds 2} \cdot \frac{f_{cm}}{f_{cmo}})] \cdot 10^{- 6} \cdot β_{RH}

α_ds1, α_ds2	Factors for considering the type of cement (see Table 2.3)
f_cm	Mean cylinder compressive strength of concrete in [N/mm²]
f_cmo	= 10 N/mm²

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