MODIFIED CONSTRUCTION MIX FOR 3D PRINTER 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 construction mixture. The modified construction mix for a 3D printer includes, wt. %: Portland cement containing, wt. %: tricalcium silicate 68.1, tricalcium aluminate 7.2, 20.0-23.0, quartz sand with a size modulus of 2.2-2.4 and a humidity of 1-2% 59.4-63.0, MasterRheobuild 183 superplasticizer based on naphthalene sulfonates 0.20-0.23, polysiloxane ether MasterPel 793 0.010-0.011, finely ground pozzolan component: a binary mixture of bio-silica 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 12,759-12,790.

EFFECT: reduction in the consumption of Portland cement and superplasticizer in the construction mix, an increase in shape stability and ensuring the absence of defects in the form of ruptures of printed layers from the construction mix 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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