The advancement of emerging 3D concrete printing (3DCP) has been hindered by two significant challenges: the weak tensile properties of conventional concrete and the difficulty of simultaneously placing reinforcement during printing. In this paper, engineered cementitious composites (ECC) with superior tensile properties along with an in-process reinforcement technique through laying CFRP meshes between ECC layers were strategically composited. Four-point bending tests were performed on 3DP-ECC beams reinforced with different layers and configurations of CFRP mesh. Experimental results demonstrated that CFRP meshes can deform collaboratively with ECC, and enhance the load bearing capacity of 3DP-ECC beams to 1.22–2.01 times compared to that of unreinforced beam, while moderately decrease the deformation capacity of printed beams. A theoretical model for predicting the load bearing capacity and bending moment-curvature relationship of 3DP-ECC beams was further proposed. This paper validated the feasibility and effectiveness of CFRP mesh in reinforcing 3DP-ECC beams for efficient 3DCP construction.

中文翻译：

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3D 打印工程水泥基组合梁的自动加固


新兴的 3D 混凝土打印 （3DCP） 的发展受到两个重大挑战的阻碍：传统混凝土的弱拉伸性能和在打印过程中难以同时放置钢筋。在本文中，通过在 ECC 层之间铺设 CFRP 网，将具有卓越拉伸性能的工程水泥基复合材料 （ECC） 以及加工中加固技术进行了战略性合成。对用不同层和 CFRP 网格结构加固的 3DP-ECC 梁进行了四点弯曲试验。实验结果表明，CFRP 网格可以与 ECC 协同变形，将 3DP-ECC 梁的承载能力提高到未增强梁的 1.22–2.01 倍，同时适度降低打印梁的变形能力。进一步提出了预测 3DP-ECC 梁承载力和弯矩-曲率关系的理论模型。本文验证了 CFRP 网格在加固 3DP-ECC 梁以实现高效 3DCP 施工的可行性和有效性。