RAW MATERIAL MIXTURE FOR CONSTRUCTION 3D PRINTING IN ADDITIVE MANUFACTURING TECHNOLOGY Russian patent published in 2022 - IPC C04B28/04 C04B111/20 B33Y70/00 

FIELD: construction materials.

SUBSTANCE: invention relates to the field of construction materials industry and can be used for the manufacture of building products and structures in additive manufacturing technology by layer-by-layer extrusion (3D printing) of a raw mixture. The raw material mixture for construction 3D printing in additive manufacturing technology includes, wt. %: Portland cement containing, wt. %: tricalcium silicate 68.1, tricalcium aluminate 7.2, 21.0-24.0, quartz sand with a size modulus of 2.2-2.4 and a moisture content of 1-2% 60.54-63.99, MasterPozzolith 55 superplasticizer based on lignosulfonates 0.21-0.24, finely ground pozzolan component metakaolin with a hydraulic activity of at least 1200 mg/g, a grinding degree of at least 2000 m²/kg 2.1-2.4, sodium methylsilicate “GKZH-11N” 0.010-0.012, water 12.690-12.808.

EFFECT: reduction in the consumption of Portland cement and superplasticizer in the raw material mixture, an increase in shape stability and ensuring the absence of defects in the form of ruptures of printed layers from the raw material mixture with the possibility of its extrusion on construction 3D printers implementing the method for layer–by-layer extrusion, a reduction in shrinkage deformations, water absorption and an increase in the bending strength of hardened composites printed on a 3D printer.

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