MODIFIED GYPSUM-CEMENT-POZZOLANIC CONCRETE 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, polysiloxane ether and water. Modified gypsum-cement-pozzolanic concrete mixture for 3D printing includes portland cement, sand, superplasticiser based on polycarboxylate esters "MasterGlenium 430", water, finely ground pozzolanic component – biosilica with hydraulic activity of not less than 1,400 mg/g, degree of grinding not less than 1,100 m²/kg. Portland cement is used containing the following, 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 – "БЕСТ-ТБ" 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