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.

中文翻译：

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开发新型挤出装置以提高 3D 打印地聚合物混凝土的可打印性

本研究利用新型挤出设备探索 3D 地质聚合物混凝土的可打印性。地质聚合物以其环保和快速固化而闻名，为 3D 打印中的传统水泥提供了一种环保的替代品。开发了一种集混合和搅拌功能于一体的新型挤出装置，可以有效地混合硅酸钠粉末和前驱体浆料。混合比、时间和速度的系统实验揭示了地质聚合物混凝土可印刷性的最佳条件。前体浆料可泵送 90 分钟，并在新装置中表现出快速反应性。挤压地质聚合物混凝土表现出卓越的可施工性，屈服强度增长率达到 931.69 Pa/s。实际打印测试仅用 26.87 分钟即可打印出 154 层、高 1840 毫米的空心圆柱体。增加混合时间可增强抗压强度并降低孔隙率，展示了这种按需设置方法和新型挤出装置在 3D 打印地质聚合物混凝土应用中的潜力。