MODIFIED BUILDING MIXTURE FOR 3D PRINTING 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 building mixture for 3D printing includes, wt.%: Portland cement, containing, wt.%: tricalcium silicate 68.1, tricalcium aluminate 7.2, 20.0-23.0, quartz sand with fineness modulus 2.2- 2.4 and humidity 1-2% 59.59-64.17, Relamix PK superplasticizer in the form of a copolymer based on polyoxyethylene derivatives of unsaturated carboxylic acids 0.20-0.23, finely ground pozzolanic component - a binary mixture of biosilica with hydraulic activity not less than 1400 mg/g, degree of grinding not less than 1100 m²/kg 2.0-2.3 and metakaolin with hydraulic activity not less than 1200 mg/g, degree of grinding not less than 2000 m2/kg 2.0-2.3 , water 11.63-12.58.

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.

1 cl, 2 tbl