MODIFIED RAW BLEND 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 additive manufacturing technology by layer-by-layer extrusion (3D printing) of the raw mixture. Modified raw 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 fineness modulus 2.2- 2.4 and humidity 1-2% 62.15-65.68, superplasticizer "Polyplast SP-1" based on sodium salts of polymethylenenaphthalenesulfonic acids 0.20-0.23, finely ground pozzolanic component - biosilica with a hydraulic activity of at least 1400 mg/g, grinding degree not less than 1100 m²/kg 2.0-2.3, methylsilanetriol potassium salt "GKZH-11K" 0.010-0.012, water 12.110-12.308.

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

1 cl, 2 tbl