Abstract
This study explores the printability of 3D geopolymer concrete using a novel extrusion device. Geopolymer, known for its eco-friendliness and rapid curing, offers an eco-friendly alternative to conventional cement in 3D printing. A novel extrusion device, integrating mixing and stirring functions, was developed to blend sodium silicate powder and precursor slurry effectively. Systematic experiments on mixing ratio, time, and speed revealed optimal conditions for geopolymer concrete printability. The precursor slurry remained pumpable for 90 min and displayed rapid reactivity in the new device. The extruded geopolymer concrete exhibited exceptional buildability, reaching a remarkable yield strength growth rate of 931.69 Pa/s. Actual printing tests resulted in a 154-layer hollow cylinder, 1840 mm tall, printed in just 26.87 min. Increasing mixing time enhanced compressive strength and reduced porosity, showcasing the potential of this set-on-demand approach and the novel extrusion device in 3D printable geopolymer concrete applications.
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