METHOD OF 3D PRINTING WITH TRANSITION LAYER TO ENSURE ADHESION OF LAYERS DURING LONG TECHNOLOGICAL BREAKS Russian patent published in 2024 - IPC E04G21/04 B33Y10/00 C04B28/04 E04B2/84 B33Y70/00 

FIELD: construction.

SUBSTANCE: invention relates to construction and can be used for additive production by layer-by-layer extrusion (3D printing) of construction products, structures, buildings and constructions. Disclosed is method for 3D printing with a transition layer to ensure adhesion of layers during long process breaks, which includes preparation of a concrete mixture, which includes portland cement, quartz sand and water, extruding it in the form of a plastic filament through the dispensing head of the printer with laying into the design position, preparing the modified concrete mixture for the transition layer containing the following in wt.%: portland cement 20–30, quartz sand 44.4–69.8, superplasticiser "MasterRheobuild 183" based on naphthalene sulphonates 0.1–0.6, finely ground pozzolanic component – diatomite with hydraulic activity of not less than 1,500 mg/g, degree of grinding of not less than 1,400 m²/kg – 2–6, organosilicon compound – potassium methyl siliconate 0.1–0.8 and water 8–18.5, its laying on a filament from said concrete mixture, implementation of a technological break with subsequent resumption of laying of said filament, wherein before laying transition layer on top of previously laid layer of filament, laying steel electrodes, during the technological break, the laid layers are exposed to an electric field created by passing alternating electric current through the modified concrete mixture by connecting electrodes to power source – single-phase portable welding transformer "BlueWeldGamma 4.181", wherein duration of electric field exposure is 0.1–3 hours.

EFFECT: provision of possibility to control duration of technological break by method of layer-by-layer extrusion at implementation of long technological breaks by increasing the average rate of gaining the critical plastic strength of the concrete of the transition layer while ensuring high quality of construction products with long technological interruptions of construction 3D printing, due to provision of high adhesion index of layers (0.5–1.5 MPa), excluding formation of cold seams.

1 cl