暴露于打印后温度干扰的 3D 打印水泥基材料的层界面特性和附着力

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Yi Zhang , Yaxin Tao , Jose R.A. Godinho , Qiang Ren , Zhengwu Jiang , Kim Van Tittelboom , Geert De Schutter
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引用次数: 0

摘要

层界面对三维打印水泥基材料(3DPCM)的性能和寿命至关重要,但由于缺乏模板,层界面对环境条件非常敏感。然而,由于目前对温度如何影响层界面的了解有限,限制了 3D 打印在不同建筑场景中的应用。在此,我们通过汞侵入孔隙模拟法、X 射线计算机断层扫描、纳米压痕和扫描电子显微镜与能量色散光谱技术,揭示了温度对层界面多尺度相分布特征的影响。此外,还通过劈裂拉伸试验评估了 3DPCM 的层间结合强度。为深入分析其机理,还采用了小振幅振荡、表面粗糙度和等温量热测量法。结果表明,压印后温度的升高会减少层界面与块状基质之间的骨料体积分数差异,这是由于骨料的结构化率和界面上的水泥浆量都在增加,从而减少了骨料的沉降。随着温度的升高,层界面和大体积基质之间的孔隙率差异也会减小,这是由于水合物的快速填充使孔径细化。此外,在较高温度下硬化的 3DPCM 的层界面上观察到了更集中的水合物原子比和弹性模量分布。固化温度升高可提高 3DPCM 的层间粘结强度,原因是骨料交错性增强、孔隙率降低和高密度 CSH 含量提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Layer interface characteristics and adhesion of 3D printed cement-based materials exposed to post-printing temperature disturbance
The layer interface, which is vital for the performance and longevity of 3D printed cement-based materials (3DPCM), is very sensitive to the environmental conditions because of the lack of formwork. Nevertheless, the current limited understanding of how temperature affects the layer interface has restricted the application of 3D printing in different construction scenarios. Here, we revealed the effects of temperature on the multi-scale phase distribution features of the layer interface through mercury intrusion porosimetry, X-ray computed tomography, nanoindentation and scanning electron microscopy with energy dispersive spectroscopy techniques. Additionally, the interlayer bond strength of 3DPCM was evaluated via the splitting tensile test. Small amplitude oscillation, surface roughness and isothermal calorimetry measurements were employed for an in-depth analysis of the mechanisms. Results indicate that an increase in temperature post-printing reduces the discrepancies in aggregate volume fraction between the layer interface and bulk matrix due to the increasing structuration rate and the amount of cement paste at the interface due to the reduced settlement of aggregates. The porosity difference between the layer interface and bulk matrix decreased with increasing temperature due to the pore size refinement by faster filling with hydrates. In addition, a more concentrated distribution of atomic ratios and elastic modulus of hydrates were observed at the layer interface of 3DPCM hardened at higher temperatures. Increased curing temperature improves the interlayer bond strength of 3DPCM owing to the enhanced aggregate interlocking, reduced porosity and improved high-density CSH content.
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来源期刊
Cement & concrete composites
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.
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