Currently, applying 3D concrete printing to compressed structural systems with low tensile/shear stresses is a feasible and alternative route to promote this advanced technology into engineering practice because of the lack of an effective structural reinforcing method. Modular manufacturing of segmental components and fabricated construction of large-scale structures are promising for overcoming the limitations of the working dimensions of 3D printers. In this study, four different interlocking configurations are designed with "I," "V," "π," and "s"-shaped forms. Moreover, three cementitious composites―cement-, epoxy-, and phosphate-based composites―are prepared, aiming at optimizing the mechanical integrity and capacity of prefabricated structures with mechanical bite and adhesive forces. The effects of the interlocking forms on the interfacial connection strength at the joints are investigated and evaluated by compression–tensile and compression–shear tests. The results provide experimental data and references for constructing large-scale concrete arch structures by the modular assembly of 3D-printed segments.

当前，由于缺乏有效的结构加固方法，将3D混凝土打印应用于具有低拉伸/剪切应力的压缩结构系统是将这一先进技术推广到工程实践的可行和替代途径。分段组件的模块化制造和大型结构的制造结构有望克服3D打印机工作尺寸的局限性。在这项研究中，设计了四种不同的互锁配置，分别为“ I ”，“ V ”，“ π ”和“ s ” 。此外，还准备了三种水泥基复合材料，即水泥，环氧和磷酸盐基复合材料，目的是通过机械咬合和粘附力来优化预制结构的机械完整性和承载力。通过压缩-拉伸和压缩-剪切试验研究和评估了连接处的界面连接强度，结果为通过3D打印段的模块化组装构造大型混凝土拱结构提供了实验数据和参考。