Extrudability of mortars designed for 3d printers

Abstract

The use of 3D printers in the construction industry is increasing day by day. The grout used in 3D printers must be specially designed to be printed. In this study, the extrudability of mortars designed for 3D printing was investigated. Mortars using cement as binder were prepared with aggregates with a maximum particle size of 0.4 mm and at a water / cement ratio of 0.37. The mortars were extruded in the extruder at speeds of 50-200 mm / min using a circular and rectangular outlet. RAM type extrusion was used in the study. The continuous flow length of the mortars after exiting the extruder was measured. According to the results, with the increase of the extrusion speed, the continuous flow of the mortars was achieved. On the other hand, mortars extruded with a rectangular exit end could be obtained more seamlessly than those extruded with circular ends. For 3D printer mortars, mortars that can be extruded continuously and do not disperse on the surface were obtained.