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

FIELD: building materials industry.

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. Construction 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% 61.86-65.95, superplasticizer "Polyplast SP-1" based on sodium salts of polymethylenenaphthalenesulfonic 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, sodium methylsiliconate "GKZH-11N" 0.010-0.012, water 11.840-12.598.

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 3D printed composites.

1 cl, 2 tbl