回收碳纤维对混凝土电热性能的影响

王艳; 李文俊; 李奥阳; 孙琳琳; 郭冰冰

回收碳纤维对混凝土电热性能的影响

王艳^{1, 3, ,},
李文俊¹,
李奥阳¹,
孙琳琳¹,
郭冰冰^{2, 3}

1.
西安建筑科技大学　材料科学与工程学院, 西安 710055
2.
西安建筑科技大学　土木工程学院, 西安 710055
3.
绿色建筑全国重点实验室, 西安 710055

基金项目: 国家自然科学基金 (52078414)；陕西省自然科学基金(2020JM-469)

详细信息

通讯作者:
王艳，博士，教授，博士生导师，研究方向为混凝土结构耐久性、智能材料及结构系统　E-mail:wangyanwjx@126.com

中图分类号: TU528.582;TB332
计量
- 文章访问数: 35
- HTML全文浏览量: 17
- 被引次数: 0
出版历程
- 收稿日期: 2024-01-17
- 修回日期: 2024-03-06
- 录用日期: 2024-03-13
- 网络出版日期: 2024-04-20

Effect of recycled carbon fiber on the electrothermal properties of concrete

WANG Yan^{1, 3
, ,},
LI Wenjun¹,
LI Aoyang¹,
SUN Linlin¹,
GUO Bingbing^{2, 3}

1.
School of materials science and engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
2.
School of civil engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
3.
State Key Laboratory of Green Building, Xi’an University of Architecture and Technology, Xi’an 710055, China

Funds: National Natural Science Foundation of China (52078414); Natural Science Foundation of Shanxi Province (2020JM-469)

摘要

摘要: 碳纤维在生产使用过程中会产生大量的废弃料，将回收碳纤维(Recycle Carbon Fiber，RCF)掺入混凝土中既能减少RCF对环境造成的污染，又能实现高利用价值。本文研究了回收碳纤维混凝土(Recycle Carbon Fiber Concrete，RCFC)在不同RCF掺量下的力学性能、导电性能和电热性能。结果表明，随RCF掺量的增加，RCFC抗压强度降低，但抗折强度略有提升，而电阻率明显下降，最大降幅为99.11%。通电一定时间后，RCFC的热传导效果显著，且升温速率随着RCF掺量、输入电压的增加而增大。当环境温度为20℃、−10℃、−30℃ 时，能使RCFC产生电热性能的最小纤维掺量分别为1.0vol.%、1.5vol.%、2.0vol.%，所对应的最高升温速率分别是2.267℃/min、2.525℃/min和1.45℃/min。
- 回收碳纤维混凝土 /
- 力学性能 /
- 导电性能 /
- 电热性能 /
- 传热机制
Abstract: Carbon fiber in the production and use of the process will produce a large number of waste materials, the recycled carbon fiber (Recycle Carbon Fiber (RCF)) into the concrete can reduce the pollution caused by RCF to the environment, but also to achieve a high value of utilization. In this paper, the mechanical properties, electrical conductivity and electro-thermal properties of Recycle Carbon Fiber Concrete (RCFC) were investigated under different RCF mixing amounts. The results showed that with the increase of RCF dosage, the compressive strength of RCFC decreased, but the flexural strength slightly increased, while the electrical resistivity decreased significantly, with a maximum decrease of 99.11%. After a certain time of energization, the heat conduction effect of RCFC is significant, and the warming rate increases with the increase of RCF doping and input voltage. When the ambient temperature is 20℃, −10℃ and −30℃, the minimum fiber doping amount that can make RCFC produce electrical and thermal performance is 1.0vol.%, 1.5vol.% and 2.0vol.%, respectively, and the corresponding maximum temperature rise rate is 2.267℃/min, 2.525℃/min and 1.45℃/min, respectively.
- Recycled carbon fiber concrete /
- mechanical property /
- electrically conducting properties /
- electro thermal performance /
- heat transfer mechanism

HTML全文

图 1 回收碳纤维(RCF)与原始碳纤维(VCF)外观

Figure 1. Recycle carbon fiber (RCF) and virgin carbon fiber (VCF) appearance

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图 2 RCF与VCF在水中分散性能

Figure 2. Dispersion properties of RCF and VCF in water

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图 3 RCF与VCF在SEM下微观形貌

Figure 3. The micro-morphology of RCF and VCF under SEM

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图 4 RCF的EDS能谱

Figure 4. EDS spectrum of RCF

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图 5 VCF的EDS能谱

Figure 5. EDS spectrum of VCF

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图 6 电热升温试验

Figure 6. Electrothermal heating test

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图 7 回收碳纤维混凝土(RCFC)力学和导电性能

Figure 7. Mechanical and electrical properties of recycle carbon fiber concrete (RCFC)

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图 8 RCFC内部搭接

Figure 8. RCFC internal lap joint

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图 9 20℃下RCFC的电热性能

Figure 9. Electrical and thermal performance of RCFC at 20°C

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图 10 −10℃下RCFC的电热性能

Figure 10. Electrical and thermal performance of RCFC at 20°C

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图 11 −30℃下RCFC的电热性能

Figure 11. Electrical and thermal performance of RCFC at 20°C

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图 12 RCFC传热机制

Figure 12. Heat transfer mechanism of RCFC

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图 13 10 V电压下RCFC升温速率

Figure 13. Heating rate of RCFC at 10 V voltage

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图 14 20 V电压下RCFC升温速率

Figure 14. Heating rate of RCFC at 20 V voltage

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图 15 30 V电压下RCFC升温速率

Figure 15. Heating rate of RCFC at 30 V voltage

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表 1 水泥化学成分/wt%

Table 1. Chemical composition of Cement/wt%

SiO₂ Al₂O₃ Fe₂O₃ CaO MgO SO₃ K₂O Na₂O TiO₂ Else

19.05 4.64 3.71 58.28 2.45 3.92 1.11 0.28 0.31 6.25

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