MODIFIED BUILDING MIXTURE FOR A 3D PRINTER IMPLEMENTING THE LAYERED EXTRUSION METHOD Russian patent published in 2022 - IPC C04B28/04 C04B111/20 B33Y70/00 

FIELD: building materials.

SUBSTANCE: invention relates to the field of building materials industry and can be used for the manufacture of building products and structures in the technology of additive manufacturing by layer-by-layer extrusion (3D printing) of a modified building mixture. The modified mixture for a 3D printer implementing the layer-by-layer extrusion method includes, wt.%: Portland cement containing, wt.%: tricalcium silicate 68.1, tricalcium aluminate 7.2, 20.0-23.0, quartz sand with modulus of size 2.2-2.4 and moisture content 1-2% 59.30-63.85, superplasticizer "Relamix PK" in the form of a copolymer based on polyoxyethylene derivatives of unsaturated carboxylic acids 0.20-0.23, a binary mixture of finely ground pozzolanic component - diatomite with a hydraulic activity of at least 1500 mg/g, a grinding degree of at least 1400 m²/kg 2.0-2.3 and a finely ground component - kaolin with a hydraulic activity of 627.3 mg/g, a grinding degree of at least 1800 m²/kg 2.0-2.3, water 11.95-12.87.

EFFECT: reducing the consumption of Portland cement and superplasticizer in the modified building mixture, increasing dimensional stability and ensuring the absence of defects in the form of ruptures in printed layers from the modified building mixture with the possibility of extruding it on building 3D printers that implement the layer-by-layer extrusion method, reducing shrinkage deformations, water absorption and increasing the ultimate strength at bending of hardened composites printed on a 3D printer.

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