Clear distance between individual parallel bars of reinforcement: the values of k1 and k2
Eurocode 2 part 1-1: Design of concrete structures 8.2 (2)
The clear distance (horizontal and vertical) between individual parallel bars or horizontal layers of parallel bars should be not less than the maximum of k1⋅bar diameter, (dg + k2 mm) or 20 mm (where dg is the maximum size of aggregate).
Recommendation
The recommended values for k1 and k2 when determining the clear distance between bars are 1 and 5 mm respectively.
