Development of CO2-activated interface enhancer to improve the interlayer properties of 3D-printed concrete

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-05-13 DOI:10.1016/j.cemconcomp.2025.106122

Hao Lucen , Lyu Hanxiong , Zhang Huanghua , Zhang Shipeng , Xiao Jianzhuang , Poon Chi Sun

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引用次数: 0

Abstract

This paper presents an approach to enhance the interlayer properties of 3D-printed concrete (3DPC) by synchronously spraying CO₂-activated interface enhancer (CIE) onto the surface of printed concrete filament during the printing process, thus overcoming the inherent limitation of weak interlayer properties and unlocking new possibilities for automation construction. The CIE was developed by using dicalcium silicate (C₂S), a binder mineral with high carbonation activity. It was found that applying a 100 μm thick CIE resulted in a remarkable enhancement ratio of 249.3 % in the interlayer strength of 3DPC at 28 days. Subjected carbonation, CIE produced calcium carbonates and silica gel, which effectively filled the interlayer microstructure, leading to a reduced porosity. Furthermore, the activation of the CIE led to the growth of spear-like calcium carbonate crystals and rod-like ettringite crystals, which played a crucial role in enhancing the bonding performance by forming an interlocking microstructure. Contrary to common belief, a prolonged printing interval was beneficial for CIE, as it allowed for increased CO₂ penetration, thereby enhancing the carbonation degree. In conclusion, the CIE developed in this study can be considered a promising approach for enhancing the interlayer properties of 3DPC.

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提高3d打印混凝土层间性能的co2活化界面增强剂的研制

本文提出了一种通过在打印过程中在打印混凝土细丝表面同步喷涂二氧化碳激活界面增强剂（CIE）来增强3d打印混凝土（3DPC）的层间性能的方法，从而克服了层间性能弱的固有限制，为自动化施工开启了新的可能性。采用高碳化活性的粘结剂矿物硅酸二钙（C2S）制备了CIE。结果表明，采用100 μm厚的CIE， 28 d时3DPC的层间强度增强率达到249.3%。经过碳化，CIE产生碳酸钙和硅胶，有效地填充了层间微观结构，从而降低了孔隙率。此外，CIE的活化导致了矛状碳酸钙晶体和棒状钙矾石晶体的生长，它们通过形成互锁的微观结构对增强键合性能起着至关重要的作用。与普遍的看法相反，延长印刷间隔对CIE是有益的，因为它允许增加二氧化碳渗透，从而提高碳化程度。综上所述，本研究开发的CIE可以被认为是提高3DPC层间性能的一种有前途的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.