MODIFIED GYPSUM-CEMENT-POZZOLANIC CRUDE MIXTURE FOR 3D PRINTING Russian patent published in 2024 - IPC C04B28/14 B33Y70/00 

FIELD: construction materials.

SUBSTANCE: invention relates to the industry of construction materials and can be used for production of construction products and structures in technology of additive production by method of layer-by-layer extrusion (3D-printing) of crude mixture based on portland cement, hemihydrate gypsum, sand, finely ground pozzolanic component, superplasticizer, setting and hardening time regulator, polyphenylethoxysiloxane and water. Set task is achieved by the fact that modified gypsum-cement-pozzolanic crude mixture for 3D printing, including portland cement, sand, superplasticiser based on sodium salts of polymethylene naphthalene sulphonic acids "Polyplast СП-1", water, finely ground pozzolanic component – diatomite with hydraulic activity of not less than 1,500 mg/g, degree of grinding of not less than 1,400 m²/kg, is characterized by that portland cement is used, which contains, wt.%: tricalcium silicate 63.0, tricalcium aluminate 6.1, quartz sand with fineness modulus of 3 and moisture content of 1–3% is used as sand, and additionally it contains hemihydrate gypsum, setting and hardening time regulator – "БЕСТ-ТБ" and polyphenylethoxysiloxane "ФЭС-50" 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