TWO-PHASE MIXTURE BASED ON CEMENT FOR COMPOSITES IN CONSTRUCTION 3D PRINTING TECHNOLOGY

摘要

FIELD: construction.;SUBSTANCE: invention relates to construction materials 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 7.6–7.8:1. Phase 1 includes Portland cement CEM I 42.5 H, sand with fineness modulus Mk≤1.25, xanthan gum with content (C₃₅H₄₉O₂₉)_n of not less than 91 %, technical tetrapotassium pyrophosphate with content of K₄P₂O₅ not less than 98 %, polypropylene fibre with length of 12 mm. Components of solid phase are in mass ratio, %: portland cement - 44.1–44.5; sand - 55.14–55.4; xanthum gum - 0.08–0.1; technical tetrapotassium pyrophosphate - 0.08–0.1; polypropylene fibre - 0.2–0.3. Phase 2 contains water and superplasticizer based on polycarboxylate esters. Weight ratio of components of liquid phase is, %: superplasticizer - 4.1–4.6; water 95.4–95.9.;EFFECT: technical result is increased plasticity, shape stability, compression strength, bending tensile strength, adhesion strength of composite layers.;1 cl, 1 tbl