RAW MIXTURE FOR CONSTRUCTION 3D PRINTING Russian patent published in 2022 - IPC C04B28/04 B33Y70/00 

FIELD: building materials.

SUBSTANCE: invention relates to the industry of building materials and can be used for manufacturing building articles and structures in the additive manufacturing technology by fused deposition (3D printing) of the raw mixture based on Portland cement, sand, fine pozzolanic component, superplasticiser, and polysiloxane ether. Raw mixture for construction 3D printing includes Portland cement, sand, superplasticiser, and water. Portland cement contains 68.1 wt.% tricalcium silicate, 7.2 wt.% tricalcium aluminate, quartz sand with a grain size of 2.2 to 2.4 and a moisture content of 1 to 2 wt.% is used as sand, "MasterRheobuild 183" based on naphthalene sulphonates is used as a superplasticiser, and additionally the raw mixture contains polysiloxane ether "MasterPel 793", a binary mixture of fine pozzolanic component — biosilica with a milling degree of at least 1,100 m²/kg and a hydraulic activity of at least 1,400 mg/g and kaolin with a milling degree of at least 1,800 m²/kg and a hydraulic activity of kaolin of 600 mg/g, with the following content of the components, % wt.: Portland cement 20.0 to 23.0, superplasticiser "MasterRheobuild 183" 59.4 to 63.0, quartz sand 0.20 to 0.23, finely ground pozzolanic component biosilica 2.0 to 2.3, finely ground component kaolin 2.0 to 2.3, polysiloxane ether "MasterPel 793" 0.010 to 0.012, water 12.758 to 12.790.

EFFECT: reduced consumption of Portland cement and superplasticiser in the raw material mixture, higher shape stability and prevented formation of defects in the form of breakage of the printed layers of the raw material mixture with the possibility of extrusion thereof on construction 3D printers implementing the fused deposition method, reduced shrinkage strain and water absorption, higher bending strength limit of the cured 3D-printed composites (without moulds).

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