Abstract Shotcrete 3D Printing (SC3DP) is a novel robot-guided AM technology developed at Technische Universitat Braunschweig in the environment of the Digital Building Fabrication Laboratory (DBFL). For successful automation, it is crucial to understand and redefine the entire concrete spraying process with all its interdependent parameters. This paper presents the basic principles of the SC3DP technology together with the results of a comparative study on the influence of the two concrete printing techniques extrusion and SC3DP on the interlayer bond strength. In particular, the effect of different time intervals between the deposition of two adjacent layers regarding mechanical properties (bond strength) is investigated. As will be shown, the SC3DP method allows convenient mechanical properties although the printed samples exhibit distinct anisotropies. The reasons are discussed based on investigations of the air void distribution by micro CT and mechanical test results.

中文翻译：

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工艺参数对喷射混凝土 3D 打印 (SC3DP) 增材制造混凝土构件层间粘结强度的影响

摘要 喷射混凝土 3D 打印 (SC3DP) 是一种新型机器人引导 AM 技术，由布伦瑞克工业大学在数字建筑制造实验室 (DBFL) 环境中开发。对于成功的自动化，了解和重新定义整个混凝土喷射过程及其所有相互依赖的参数至关重要。本文介绍了 SC3DP 技术的基本原理以及对两种混凝土印刷技术挤出和 SC3DP 对层间粘合强度影响的比较研究结果。特别地，研究了两个相邻层的沉积之间的不同时间间隔对机械性能（粘合强度）的影响。正如将要展示的那样，尽管打印的样品表现出明显的各向异性，但 SC3DP 方法允许方便的机械性能。基于显微CT和机械测试结果对空气空隙分布的调查讨论了原因。