BUILDING MIXTURE BASED ON CEMENT 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 building mixture. Cement-based 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% 60.13-63.34, superplasticizer "MasterGlenium 430" based on polycarboxylate esters 0.20-0.23, polyphenylethoxysiloxane "FES-50" 0.010-0.011, finely ground pozzolanic component - a binary mixture of biosilica with a hydraulic activity of at least 1400 mg/g, a grinding degree of at least 1100 m²/kg 2.0-2.3 and metakaolin with a hydraulic activity of at least 1200 mg/g, a grinding degree of at least 2000 m²/kg 2 .0-2.3, water 12.029-12.450.

EFFECT: reducing the consumption of Portland cement and superplasticizer in the building mixture, increasing dimensional stability and ensuring the absence of defects in the form of ruptures in printed layers from the 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 flexural strength of hardened composites printed on a 3D printer.

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