The Theory of Critical Distances to assess the effect of cracks/manufacturing defects on the static strength of 3D-printed concrete

•Strength of 3D-printed concrete containing cracks/defects is investigated experimentally.•3D-printed concrete is modelled as a linear-elastic, homogenous, and isotropic material.•Critical distance methods are used to assess static strength of 3D-printed concrete.•The proposed assessment methods can be used in conjunction with commercial FE codes.