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

FIELD: construction materials.

SUBSTANCE: invention relates to the field of the construction materials industry. The modified cement-based raw material mixture for 3D construction printing includes Portland cement, sand, superplasticizer and water. Portland cement contains tricalcium silicate 68.1, wt. %, tricalcium aluminate 7.2, wt. %, MasterPozzolith based on lignosulfonates is used as a superplasticizer, quartz sand with a size modulus of 2.2-2.4, humidity of 1-2% is used as sand, the mixture additionally contains a finely ground pozzolan component: diatomite with a grinding degree of at least 1400 m²/kg and hydraulic activity of at least 1500 mg/g and polysiloxane ether MasterPel 793 with the following component content, wt. %: Portland cement 20.0-23.0, quartz sand 61.89-65.81, superplasticizer 0.20-0.23, diatomite 2.0-2.3, polysiloxane ether 0.010-0.012, water 11.980-12.568.

EFFECT: reducing the consumption of Portland cement and superplasticizer, increasing the shape stability and ensuring the absence of defects in the form of ruptures of printed layers from a modified raw material mixture with the possibility of its extrusion on construction 3D printers, reducing shrinkage deformations, water absorption, increasing the bending strength of hardened composites printed on a 3D printer.

1 cl, 2 tbl