MODIFIED CEMENT-BASED CONSTRUCTION MIX FOR 3D PRINTING Russian patent published in 2022 - IPC C04B28/04 

FIELD: construction materials.

SUBSTANCE: invention relates to the field of construction materials industry and can be used for the manufacture of building products and structures in additive manufacturing technology using layer-by-layer extrusion (3D printing) of a modified construction mixture based on Portland cement, sand, finely ground pozzolan component, superplasticizer and methylsilantriol potassium salt. The modified cement-based construction mix for 3D printing, including Portland cement, sand, superplasticizer and water, characterized in that Portland cement contains, wt. %: 68.1 tricalcium silicate, 7.2 tricalcium aluminate, quartz sand with a grain size of 2.2-2.4 and a moisture content of 1-2, MasterPozzolith 55 based on lignosulfonates is used as a superplasticizer, and additionally modified construction mixture contains methylsilantriol potassium salt ”GKZH-11K”, a binary mixture of finely ground pozzolan component: bio-silica with a grinding degree of at least 1100 m²/kg and a hydraulic activity of at least 1400 mg/g and kaolin with a grinding degree of at least 1800 m²/kg and a hydraulic activity of kaolin 600 mg/g with the following component content, wt. %: specified Portland cement 20.0–23.0, specified quartz sand 59.20-62.85, superplasticizer MasterPozzolith 55 0.20-0.23, finely ground pozzolan component: biosilicon 2.0-2.3, finely ground component: kaolin 2.0-2.3, methylsilantriol potassium salt “GKZH-11K” 0.010-0.012, water 12.940-12.958.

EFFECT: reducing the consumption of Portland cement and superplasticizer in the modified construction mixture, increasing the shape stability and ensuring the absence of defects in the form of ruptures of printed layers from the modified construction mixture with the possibility of its extrusion on construction 3D printers implementing the method for layer-by-layer extrusion, reducing shrinkage deformations, water absorption, increasing the bending strength of hardened composites printed on 3D printer (without using forms).

1 cl, 2 tbl