MODIFIED RAW MIXTURE FOR EXTRUSION ON A 3D PRINTER Russian patent published in 2022 - IPC C04B28/04 

FIELD: building materials.

SUBSTANCE: invention relates to the 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 a raw mixture based on Portland cement, sand, finely ground pozzolanic component, superplasticizer and polyphenylethoxysiloxane. The effect is achieved by the fact that the modified raw mix for extrusion on a 3D printer includes Portland cement, sand, superplasticizer and water. Moreover, Portland cement was used, containing, wt.%: tricalcium silicate 68.1, tricalcium aluminate 7.2, quartz sand with a fineness modulus of 2.2-2.4 and a moisture content of 1-2% is used as sand, a superplasticizer is used as a superplasticizer "MasterPozzolith 55" based on lignosulfonates and additionally it contains a finely ground pozzolanic component - biosilica with a hydraulic activity of at least 1400 mg/g, a grinding degree of at least 1100 m²/kg and polyphenylethoxysiloxane "FES-50" with the following content of components, wt.%: portland cement - 20.0-23.0, sand - 61.6-65.0, superplasticizer "MasterPozzolith 55" - 0.20-0.23, finely ground pozzolanic component - biosilica - 2.0-2.3, polyphenylethoxysiloxane " FES-50 "- 0.010-0.012, water - 12.790-12.858.

EFFECT: reducing the consumption of Portland cement and superplasticizer in extrusion on a raw mix 3D printer, increasing dimensional stability and ensuring the absence of defects in the form of ruptures in printed layers from extrusion on a raw mix 3D printer with the possibility of extruding it on construction 3D printers that implement the layer-by-layer extrusion method, reducing shrinkage deformations, water absorption, increased flexural strength of hardened composites printed on a 3D printer (without the use of molds).

1 cl, 2 tbl