MODIFIED GYPSUM-CEMENT-POZZOLANIC CRUDE MIXTURE FOR EXTRUSION ON 3D PRINTER Russian patent published in 2024 - IPC C04B28/14 C04B28/04 C04B111/20 C04B111/27 B33Y70/00 

FIELD: construction.

SUBSTANCE: invention relates to the industry of construction materials and can be used for production of construction articles and structures in technology of additive production by method of layer-by-layer extrusion (3D-printing) of crude mixture. Modified gypsum-cement-pozzolanic crude mixture for extrusion on 3D printer contains, wt.%: portland cement, containing, wt.%: tricalcium silicate 63.0, tricalcium aluminate 6.1, hemihydrate gypsum 16.7, quartz sand with fineness modulus 3 and moisture content of 1–3% 54.7–55.8, superplasticiser based on MasterPozzolith MR 55 lignosulphonates 0.06–0.07, setting and hardening time regulator – “БЕСТ-ТБ” 0.05, bio-silica with hydraulic activity of not less than 1,400 mg/g, degree of grinding not less than 1,100 m²/kg 5.59, methylsilane potassium salt "ГКЖ-11 К" 0.006–0.007, water – the rest.

EFFECT: reduced consumption of portland cement, increased stability of shape, resistance to penetration, ultimate bending strength of hardened composites printed on 3D printer, reduced average density of composites while ensuring their water resistance.

1 cl, 2 tbl