TWO-PHASE MIXTURE BASED ON CEMENT FOR COMPOSITES IN CONSTRUCTION 3D PRINTING TECHNOLOGY Russian patent published in 2020 - IPC C04B28/04 

FIELD: construction.

SUBSTANCE: invention relates to construction materials which are adapted to 3D construction printing modes. Invention includes a two-phase mixture based on cement for composites in construction 3D printing technology. Two-phase mixture contains two phases: solid (phase 1) - mixture of dry components and liquid (phase 2) - aqueous solution. Ratio of the two phases is equal to 7.4–7.6:1. Phase 1 includes Portland cement CEM I 42.5 H, sand with fineness modulus Mk ≤ 1.25, metakaolin with SiO₂ content of not less than 53 % and Al₂O₃ of not less than 47 %, polypropylene fibre with length of 12 mm. Components of solid phase are in mass ratio, %: Portland cement 43.4–44.2; sand 54.8–55.3; metakaolin 0.8–1.0; polypropylene fiber 0.2–0.3. Phase 2 contains water and superplasticizer based on polycarboxylate esters. Weight ratio of components of liquid phase is, %: superplasticizer 3.0–3.6; water 96.4–97.0.

EFFECT: technical result is increased plasticity, shape stability, compression strength, bending tensile strength, adhesion strength of composite layers.

1 cl, 1 tbl