BOPI 01 BR/2024 REPERTOIRE NUMERIQUE 12 (74) SPOOR & FISHER Inc. NGWAFOR & PARTNERS SARL, The House of Gideon, Golf/Bastos Quarter, Opposite The American Embassy, Entrance-St. John Paul II Boulevard, P.O. Box 8211, YAOUNDE (CM). (57) 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. ________________________________________ (11) 21333 Consulter le mémoire (51) B28B 1/00 (2018.01); B32B 13/00 (2018.01); B32B 15/02 (2018.01); B32B 5/02 (2018.01); C04B 28/06 (2018.01); E04C 2/06 (2018.01); E04C 3/30 (2018.01) ; E04G 21/04 (2018.01) (21) 1202200335 - PCT/EP2021/053754 (22) 16/02/2021 (30) EP n° 20160827.0 du 04/03/2020 (54) 3D concrete printing with ductile cords. (72) GOUWY, Matthias (BE) et HOEKSTRA, Anne (NL) (73) NV Bekaert SA, Bekaertstraat 2, 8550 ZWEVEGEM (BE) (74) SPOOR & FISHER Inc. NGWAFOR & PARTNERS SARL, The House of Gideon, Golf/Bastos Quarter, Opposite The American Embassy, Entrance-St. John Paul II Boulevard, P.O. Box 8211, YAOUNDE (CM). (57) 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) reinforcing at least one of the layers (102, 106). The elongated steel element (104) has an elastic and plastic elongation at break that exceeds 4 %. The high elongation of the elongated steel element gives an increased ductility to the concrete structure (100).
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