Reinforcement integration is the largest technological challenge in 3D Concrete Printing. Recent studies of in-process ‘bar penetrations’ into fresh printed layers shows promise as an interlayer reinforcement. The formation of induced voids around penetrated bars reduces the bond, hindering reinforcing potential. In this study, cement paste-coating bars during penetration is investigated to increase bar bond by void filling. A cement paste is developed with red pigment added allowing visual analysis of paste coverage and embedment. Printed wall sections reinforced with and without paste-coated bars are tested in 3-point bending and compared to casted variants. Results show that paste-coated bars performed significantly better than non-paste coated bars. Strength and ductility are comparable to casted variants thereby concluding the paste-coating method effective. The hypothesis of void filling is validated through analysis of paste embedment which occurred in the top 50% of penetration. Whereas compaction of surrounding concrete occurred in the bottom region.

增强集成是3D混凝土打印中最大的技术挑战。对过程中的“钢筋渗透”到新鲜印刷层中的最新研究表明，有望将其作为中间层的增强材料。在穿透的钢筋周围形成诱导的空隙会减少粘结，从而阻碍增强潜力。在这项研究中，研究了渗透过程中的水泥浆涂覆棒，以通过空隙填充来增加棒粘结。水泥浆的开发过程中添加了红色颜料，可以对浆糊的覆盖和埋入进行可视化分析。带有和不带有粘贴涂层的钢筋加固的印刷墙部分均经过三点弯曲测试，并与浇铸变型进行了比较。结果表明，糊涂棒的性能明显好于非糊涂棒。强度和延展性可与铸造变体相媲美，从而得出有效的糊涂方法。空隙填充的假设通过分析渗透率最高的50％处的糊料包埋进行了验证。而周围混凝土的压实发生在底部区域。