METHOD FOR 3D CONCRETE PRINTING WITH LONG TECHNOLOGICAL BREAK Russian patent published in 2023 - IPC E04B2/84 B28B1/00 B33Y10/00 C04B28/04 C04B111/20 

FIELD: construction.

SUBSTANCE: used for additive manufacturing by layer-by-layer extrusion (3D printing) of construction products, structures, buildings and constructions. The method of 3D concrete printing with a long technological break includes preparing a concrete mixture, including Portland cement, quartz sand with a fineness modulus of 1.2-3 and water, squeezing it out in the form of a moulding filament through a printer dispensing head and laying it in the design position. At the same time, the modified concrete mixture for the transition layer is prepared and it is laid on the filament from the specified concrete mixture, a process break is carried out for 10, 360 or 720 minutes, followed by the resumption of laying after the process break of the specified filament, while the modified concrete mixture for the transition layer includes Portland cement, quartz sand with a fineness modulus of 1.2-3, MasterRheobuild 183 superplasticizer based on naphthalene sulfonates, finely ground pozzolanic component - diatomite with a hydraulic activity of at least 1500 mg/g, a grinding degree of at least 1400 m²/kg, organosilicon compound - potassium methyl siliconate and water with t a certain content of components.

EFFECT: longer process breaks (up to 12 hours) without formation of cold joints or reduction the adhesion of layers laid immediately before and after the process break, due to a transition layer from a modified concrete mixture, which ensures high quality of construction products.

1 cl, 2 tbl