3D printed fly ash based geopolymer was prepared with fly ash and quartz sand as main raw materials while slag powder and silica fume as supplementary cementitious materials. In this paper, anhydrous sodium silicate powder was used as activator and ATTAGEL-50 thixotropic thickener was used as 3D printing additive. The effect of slag powder and silica fume on the rheological properties of 3D printed fly ash based geopolymer was studied. The results show that the apparent viscosity, thixotropic property, plastic viscosity and yield stress of geopolymer first increased and then decreased with the increase of slag powder and silica fume respectively. Compared with the Bingham (BH) model, the Herschel- Bulkley (H–B) model is more accurate and more suitable for characterizing the rheological model of fly ash based 3D printed geopolymer. The suitable content for slag powder is 10%. On the basis of adding slag powder, silica fume was also used to replace the fly ash, the suitable content for silica fume is 10% in this fly ash-slag powder based 3D printing geopolymer. According to the SEM observations, it is found that the interior of the printing layer of the 3D printing block is more conducive to the production of the geopolymer gel than the interlaminar surface of the printing layers. It is found that the printing layers are connected with each other through bridges.

以粉煤灰和石英砂为主要原料，以矿渣粉和硅粉为辅助胶凝材料，制备了3D打印粉煤灰基地质聚合物。在本文中，无水硅酸钠粉末用作活化剂，ATTAGEL-50触变增稠剂用作3D打印添加剂。研究了矿渣粉和硅粉对3D打印粉煤灰基地质聚合物流变性能的影响。结果表明，随着矿渣粉和硅粉的增加，地聚合物的表观粘度，触变性，塑性粘度和屈服应力先升高后降低。与Bingham（BH）模型相比，Herschel-Bulkley（HB）模型更准确，更适合于表征基于飞灰的3D打印地质聚合物的流变模型。矿渣粉的合适含量为10％。在添加矿渣粉的基础上，还使用硅粉代替粉煤灰，在这种基于粉煤灰-渣粉的3D打印地质聚合物中，硅粉的合适含量为10％。根据SEM观察，发现3D印刷块的印刷层的内部比印刷层的层间表面更有利于地质聚合物凝胶的生产。发现印刷层通过桥彼此连接。发现3D打印块的打印层的内部比打印层的层间表面更有利于地质聚合物凝胶的生产。发现印刷层通过桥彼此连接。发现3D打印块的打印层的内部比打印层的层间表面更有利于地质聚合物凝胶的生产。发现印刷层通过桥彼此连接。