Modified structural and thermal insulation concrete mix for 3D printing

Abstract

FIELD: building materials industry.SUBSTANCE: invention can be used for the manufacture of building products and structures in additive manufacturing technology by layer-by-layer extrusion (3D printing) of a raw mixture based on Portland cement, sand, ground rice husk, a finely ground pozzolanic component, a superplasticizer and methylsilanetriol potassium salt. The modified structural and thermal insulation concrete mixture for 3D printing includes Portland cement, sand with a moisture content of 1-2%, superplasticizer, finely ground pozzolanic component and water. In this case, Portland cement of the “ЦЕМ 1 42.5Н” brand is used, containing, by weight: tricalcium silicate 59.7, tricalcium aluminate 8.0, dicalcium silicate 14.4, tetracalcium aluminoferrite 12.9, quartz sand with a fineness modulus of 3.5, a superplasticizer based on polycarboxylate esters - "MasterGlenium 115" is used as a superplasticizer, and waste ash from thermal power plants with a specific surface area of 230 m2 / kg, containing, wt.%: silicon dioxide 57.03, aluminium oxide 31.71, and in addition, the concrete mixture contains methylsilanetriol potassium salt "ГКЖ-11K" and ground rice husk with a bulk density of 338 kg / m3 at a certain content of components.EFFECT: reduction in the thermal conductivity coefficient, reduction in the average density of structural heat-insulating concrete, and ensuring the mouldability of the mixture using 3D printing.1 cl, 2 tbl