Vascular systems offer promising potential for enabling self-recovery in cementitious materials, but their construction in three dimensions presents significant challenges. Our group has developed an embedded printing strategy allowing for the freeform construction of 3D hollow vascular channels, overcoming previous limitations. However, concerns persist regarding the weakening of mechanical properties caused by these vascular channels. In this study, we utilize carbon dioxide curing to reinforce the vascular wall, mitigating the mechanical loss associated with hollow vascular channel. We investigate the effect of carbonation on the vascular channel wall's morphology, composition, and microhardness along the radial direction to gain insight into its impact. Additionally, we analyze the influence of both vascular channels and carbonated vascular channels on intensity and cracking behaviors under various loading directions. The findings from this investigation provide essential insights for the design and optimization of vascular networks in concrete structures.

中文翻译：

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通过碳化强化使用 3D 打印血管网络增强混凝土的机械性能


维管系统为实现胶凝材料中的自我恢复提供了广阔的潜力，但它们的三维结构带来了重大挑战。我们小组开发了一种嵌入式打印策略，允许自由构建 3D 中空血管通道，克服了以前的限制。然而，人们一直担心这些血管通道会导致机械性能减弱。在这项研究中，我们利用二氧化碳固化来加固血管壁，减轻与中空血管通道相关的机械损失。我们研究了碳化作用对沿径向的血管通道壁形态、成分和显微硬度的影响，以深入了解其影响。此外，我们还分析了维管通道和碳酸化维管通道在不同加载方向下对强度和开裂行为的影响。这项调查的结果为混凝土结构中血管网络的设计和优化提供了重要的见解。