Concrete compressive stress limitation at SLS: the value of k1
Eurocode 2 part 1-1: Design of concrete structures 7.2 (2)
Longitudinal cracks may occur if the stress level under the characteristic combination of loads exceeds a critical value. Such cracking may lead to a reduction of durability. In the absence of other measures, such as an increase in the cover to reinforcement in the compressive zone or confinement by transverse reinforcement, it may be appropriate to limit the concrete compressive stress to a value k1fck in areas exposed to environments of exposure classes XD, XF and XS (see Table 4.1).
The recommended value of k1 for the calculation of the concrete compressive stress limitation is 0,6.