三维打印碳纤维增强水泥砂浆的力学性能

IF 4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Fibers Pub Date : 2023-12-11 DOI:10.3390/fib11120109

Yeou-Fong Li, Pei-Jen Tsai, Jin-Yuan Syu, M. Lok, Huei-Shiung Chen

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引用次数: 0

摘要

由于使用了增材制造技术，三维打印工艺不同于传统的模板浇注施工方法。考虑到碳纤维增强水泥砂浆的挤出性、流动性、凝结时间和可施工性，本研究开发了一种合适的 3D 打印碳纤维增强水泥砂浆（CFRCM）。通过改变碳纤维的添加量（碳纤维与水泥的比例分别为 2.5vol.‰、5vol.‰、7.5vol.‰ 和 10vol.‰）和固化时间（第 7 天和第 28 天），研究了 3D 打印试样与传统浇注试样在抗压强度和抗折强度方面的差异。实验结果表明，在水泥基砂浆中添加 6 wt.%的水泥促进剂后，初凝时间可控制在半小时左右。CFRCM 的流动性可通过调整超塑化剂的用量来控制。当坍落度在 150 毫米到 190 毫米之间时，碳纤维与水泥的比率为 2.5 Vol.‰，可以加入水泥基砂浆中，从而打印出高度达 750 毫米的空心圆柱体。将三维打印试样与传统浇注试样进行比较后发现，碳纤维与水泥的比例分别为 7.5 体积‰和 10 体积‰时，抗压强度和抗折强度最佳。

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Mechanical Properties of 3D-Printed Carbon Fiber-Reinforced Cement Mortar

The 3D printing process is different from traditional construction methods of formwork casting due to the use of additive manufacturing. This study develops a suitable 3D-printed carbon fiber-reinforced cement mortar (CFRCM) considering the extrudability, fluidity, setting time, and buildability of the CFRCM. The difference in compressive strength and flexural strength between 3D-printed specimens and conventional cast specimens was investigated by varying the amount of carbon fiber added (carbon fiber to cement ratio, 2.5 vol.‰, 5 vol.‰, 7.5 vol.‰, and 10 vol.‰) and the curing times (7th day and 28th day). The results of the experiments indicate that the addition of 6 wt.% cement accelerators to the cementitious mortar allows for a controlled initial setting time of approximately half an hour. The fluidity of the CFRCM was controlled by adjusting the dosage of the superplasticizer. When the slump was in the range of 150 mm to 190 mm, the carbon fiber to cement ratio 2.5 vol.‰ could be incorporated into the cementitious mortar, enabling the printing of hollow cylinders with a height of up to 750 mm. Comparing the 3D-printed specimens with the traditionally cast specimens, it was found that the addition of a carbon fiber to cement ratio of 7.5 vol.‰, and 10 vol.‰ resulted in the optimal compressive strength and flexural strength, respectively.

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来源期刊

Fibers Engineering-Civil and Structural Engineering

CiteScore

7.00

自引率

7.70%

发文量

审稿时长

11 weeks

期刊介绍： Fibers (ISSN 2079-6439) is a peer-reviewed scientific journal that publishes original articles, critical reviews, research notes and short communications on the materials science and all other empirical and theoretical studies of fibers, providing a forum for integrating fiber research across many disciplines. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. The following topics are relevant and within the scope of this journal: -textile fibers -natural fibers and biological microfibrils -metallic fibers -optic fibers -carbon fibers -silicon carbide fibers -fiberglass -mineral fibers -cellulose fibers -polymer fibers -microfibers, nanofibers and nanotubes -new processing methods for fibers -chemistry of fiber materials -physical properties of fibers -exposure to and toxicology of fibers -biokinetics of fibers -the diversity of fiber origins