MODIFIED CONCRETE MIXTURE FOR 3D PRINTING Russian patent published in 2022 - IPC C04B28/04 C04B111/20 B33Y70/00 

FIELD: building materials.

SUBSTANCE: invention relates to the building materials industry and can be used for the manufacture of building products and structures in the additive manufacturing technology by layer-by-layer extrusion (3D printing) of a modified concrete mixture. The modified concrete mix for 3D printing includes, wt.%: Portland cement, containing, wt.%: tricalcium silicate 68.1, tricalcium aluminate 7.2, 20.0-23.0, quartz sand with a grain size modulus of 2.2- 2.4 and humidity 1-2% 63.66-67.14, 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 - diatomite with a hydraulic activity of at least 1500 mg/g and grinding degree not less than 1400 m²/kg 2.0-2.3, water 10.66-10.81.

EFFECT: reducing the consumption of Portland cement and superplasticizer in the modified concrete mixture, increasing dimensional stability and ensuring the absence of defects in the form of ruptures in printed layers from the modified concrete 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 tensile strength at bending cured composites printed on a 3D printer.

1 cl, 2 tbl