METHOD OF CONSTRUCTION 3D PRINTING WITH ADJUSTABLE DURATION OF TECHNOLOGICAL BREAK Russian patent published in 2024 - IPC 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 structures. Method for construction 3D printing with controlled duration of technological break includes preparation of concrete mixture, including 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, "MasterRheobuild 183" superplasticiser based on naphthalene sulphonates – 0.1–0.6, finely ground pozzolanic component – metakaolin with hydraulic activity of not less than 1,200 mg/g, degree of grinding of not less than 2,000 m²/kg – 1–9, organosilicon compound – potassium methylsiliconate – 0.1–0.5 and water 9–15.5, its laying on a filament from the specified concrete mixture, implementation of technological break with subsequent resumption of laying of the specified filament. Before laying the transition layer on top of the previously laid layer of filament, laying the 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 exposure to electric field 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.

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