MODIFIED GYPSUM-CEMENT-POZZOLANIC CONCRETE MIXTURE FOR CONSTRUCTION 3D PRINTING 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 concrete mixture for construction 3D printing contains, wt.%: portland cement containing, wt.%: tricalcium silicate 63.0, tricalcium aluminate 6.1, 5.59, hemihydrate gypsum 21.2, quartz sand with fineness modulus 3 and moisture content of 1–3% 54.9–55.9, superplasticiser based on lignosulphonates "MasterPozzolith MR 55" 0.06–0.07, setting and hardening time regulator "БЕСТ-ТБ" 0.05, metakaolin with hydraulic activity of not less than 1,200 mg/g, degree of grinding of not less than 2,000 m²/kg 1.12, polyphenylethoxysiloxane "ФЕС-50" 0.007-0.008, 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