CONCRETE MIXTURE BASED ON GYPSUM-CEMENT-POZZOLANIC BINDER FOR CONSTRUCTION 3D PRINTING Russian patent published in 2024 - IPC C04B28/14 C04B28/04 C04B14/06 C04B24/26 B33Y70/00 B28B1/00 C04B111/20 C04B103/32 C04B103/65 C04B103/10 

FIELD: construction materials.

SUBSTANCE: invention relates to the industry of construction materials and can be used for the manufacture of construction products and structures in the technology of additive production by layer-by-layer extrusion (3D printing) of the crude mixture based on portland cement, hemihydrate gypsum, sand, finely ground pozzolanic component, superplasticizer, setting and hardening time regulator, polysiloxane ether and water. Set task is achieved by fact that concrete mixture based on gypsum-cement-pozzolanic binder for construction 3D printing, including portland cement, sand, superplasticiser based on sodium naphthalene sulphonate "MasterRheobuild 183", water, finely ground pozzolanic component – metakaolin with hydraulic activity of not less than 1,200 mg/g, degree of grinding of not less than 2,000 m²/kg, differs by the fact that portland cement is used, which contains, wt. %: tricalcium silicate 63.0, tricalcium aluminate 6.1, sand used is quartz sand with fineness modulus of 3 and moisture content of 1–3%, and additionally it contains hemihydrate gypsum, setting and hardening time regulator – "BEST-TB" and polysiloxane ether "MasterPel 793" at a certain content of components.

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