METHOD OF ADDITIVE MANUFACTURING IN CONSTRUCTION WITH CONTROLLED DURATION OF TECHNOLOGICAL BREAK Russian patent published in 2024 - IPC B33Y10/00 B33Y70/00 C04B28/04 C04B111/20 

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 and buildings. Method of additive manufacturing in construction with controlled duration of technological break includes preparation of concrete mixture, including portland cement, quartz sand and water, extrusion thereof in form of plastic filament through printer dispensing head and laying into design position. Method comprises preparing a modified concrete mixture for the transition layer, which includes, wt.%: portland cement 20–30, quartz sand 44.4–69.8, superplasticiser "MasterRheobuild 183" based on naphthalenesulphonates 0.1–0.6, bio-silica with hydraulic activity of not less than 1,400 mg/g, degree of grinding of not less than 1,100 m²/kg 2–8, potassium methyl siliconate 0.1–0.8, water 8–16.5, and its laying on a filament from said concrete mixture. Technological break is carried out with subsequent resumption of laying of said filament. Before laying the transition layer, steel electrodes are laid on top of the previously laid layer. During the technological break, the laid layers are exposed with the electric field created by passing alternating electric current through modified concrete mixture by connecting electrodes to power source – single-phase portable welding transformer “Blue Weld Gamma 4.181”. Duration of exposure by 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 due to increase in the average rate of gaining critical plastic strength of the concrete of the transition layer while ensuring high quality of construction products with long technological breaks of construction 3D printing, due to provision of high adhesion of layers (0.5–1.5 MPa), excluding formation of cold seams.

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