3D CONCRETE PRINTING WITH WELL ANCHORING CORDS

A concrete construction (100) made by 3D concrete printing comprises: - two or more layers (102, 106) of cementitious material extruded one above the other, and - at least one elongated steel element (104, 108) reinforcing at least one of the two or more layers. The elongated steel element (104, 108) is provided with a first crimp. Due to the crimp, a good anchorage in concrete is obtained and the anchorage force is predictable, since the standard deviation of the anchorage force is very small. The elongated steel element can be a single steel wire with a diameter D, the amplitude of the crimp ranges from 1.05xD to 5.0xD. The elongated steel element can also be a steel with steel filaments having a maximum diameter d. The amplitude of the crimp ranges from 1.05xd to 5.0xd.