SUITABILITY OF MIXTURES FOR 3D PRINTING BASED ON TECHNOGENIC RAW MATERIALS

Abstract

The article studies the comparative effect of dispersed mineral products of technogenic origin on the suitability of the mixture for extrusion molding using a 3D printer. To study the properties of extruded mixtures, a laboratory printer was designed and built. The use of the most common mineral additives of technogenic origin in Ukraine was considered, in particular: ground blast furnace granulated slag, fly ash, limestone dust and granite aspiration dust.

The studied compositions of fine-grained concrete mixtures provide the minimum required values of structural strength and compressive strength at the age of 1 day. The possibility of obtaining suitable mixtures for 3D printing, based on dispersed materials of technogenic origin, is experimentally substantiated. A method is proposed for determining the suitability of mixtures for 3D printing and changing it over time, which ensures the extrusion of the mixture and the definition of a possible printing window. The criterion for determining the parameter of formability by the spread of the cone on a shaking table is different for different mineral additives, but is within the range of 200...220 mm. The proposed method can be suitable for mixtures using and containing the studied dispersed materials of technogenic origin, as well as determining the possible printing window of fine-grained concrete mixtures.