ADDITIVE BUILDING PRODUCTION METHOD BY MATERIAL EXTRUSION Russian patent published in 2023 - IPC E04G21/04 B33Y10/00 C04B28/04 C04B111/20 

FIELD: construction.

SUBSTANCE: invention relates to the field of construction and can be used for additive manufacturing by layer-by-layer extrusion (3D printing) of building products, structures, buildings and structures. The method for additive construction production by extrusion of material includes the preparation of 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 plastic filament through the dispensing head of the printer and laying it in the design position. At the same time, the modified concrete mixture for the transition layer is prepared and laid on a filament from the specified concrete mixture, a technological break is carried out for 10, 360 or 720 minutes, followed by the resumption of laying after the technological break of the specified filament. At the same time, the modified concrete mixture for the transition layer includes Portland cement, quartz sand with a fineness modulus of 1.2-3, the Polyplast BF superplasticizer based on surface-active sodium salts and alkyl sulfates, a finely ground pozzolanic component - biosilica with hydraulic with an activity of at least 1400 mg/g, a grinding degree of at least 1100 m²/kg, an organosilicon compound - potassium methyl siliconate and water.

EFFECT: invention provides the possibility of carrying out longer technological breaks (up to 12 hours) without the formation of cold joints and reducing the adhesion of layers laid directly before and after the technological break, due to the installation of a transition layer from a modified concrete mix, which determines the high quality of construction products.

1 cl, 2 tbl