回收碳纤维混凝土导电性

王艳; 张彤昕; 郭冰冰; 牛荻涛

doi:10.13801/j.cnki.fhclxb.20210902.001

回收碳纤维混凝土导电性

doi: 10.13801/j.cnki.fhclxb.20210902.001

王艳^{1, 3, ,},
张彤昕^1,,
郭冰冰^{2, 3},
牛荻涛^{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.
西安建筑科技大学　省部共建西部绿色建筑国家重点实验室，西安 710055

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

详细信息

通讯作者:
王艳，博士，教授，博士生导师，研究方向为纤维混凝土、混凝土及混凝土结构耐久性　 E-mail：wangyanwjx@126.com

中图分类号: TU528.582
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- 被引次数: 0
出版历程
- 收稿日期: 2021-06-30
- 修回日期: 2021-08-20
- 录用日期: 2021-08-20
- 网络出版日期: 2021-09-02
- 刊出日期: 2022-06-01

Conductivity of recycling carbon fiber concrete

WANG Yan^{1, 3
, ,},
ZHANG Tongxin^1
,,
GUO Bingbing^{2, 3},
NIU Ditao^{2, 3}

1.
College 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 in Western China, Xi’an University of Architecture and Technology, Xi’an 710055, China

摘要

摘要: 碳纤维增强树脂复合材料从生产、服役到退役的整个生命周期都会产生巨量废弃物，带来了严重的环境污染与资源浪费问题。本文将生产过程中产生的废弃碳纤维掺加到混凝土中，研究其对混凝土强度及导电性的影响规律与机制。结果表明，回收碳纤维对混凝土强度改善效果不明显，这是由于工业碳纤维表面的涂层使其在混凝土拌合过程中更易聚集成束，不易分散。回收碳纤维的掺入可明显提升混凝土导电性，掺量为0wt%~0.3wt%时，干燥/吸水过程改变混凝土孔结构且C—S—H凝胶重新排列、局部收缩与部分不可逆特性使混凝土产生新的导电路径，电阻率随含水率降低呈现先升后降的趋势；掺量为0.4wt%~1.5wt%时，混凝土内部形成了稳定的物理接触导电网络，龄期及含水率对导电率无明显影响。
- 回收碳纤维 /
- 纤维增强混凝土 /
- 导电性 /
- 纤维掺量 /
- 含水率
Abstract: The whole life cycle of carbon fiber reinforced polymer composite from production, service to retirement will produce huge amount of waste, bringing serious environmental pollution and resource waste. In this paper, the waste carbon fiber produced in the production process was added to the concrete to study its influence law and mechanism on the strength and conductivity of concrete. The results show that the recovery effect of carbon fiber on the strength of concrete is not obvious, because the coating on the surface of industrial carbon fiber makes it easier to gather into bundles and not easy to disperse in the process of concrete mixing. The incorporation of recycling carbon fiber can significantly improve the conductivity of concrete. When the content of recycling carbon fiber is 0wt%-0.3wt%, the drying/water absorption process changes the pore structure of concrete. And the C—S—H gel rearrangement, local shrinkage and partial irreversible characteristics make concrete produce a new conductive path. The resistivity increases first and then decreases with the decrease of water content. When the content is 0.4wt%-1.5wt%, a stable physical contact conductive network is formed in the concrete, and the age and moisture content have no obvious effect on the conductivity.
- recycling carbon fiber /
- fiber reinforced concrete /
- electrical conductivity /
- fiber content /
- moisture content

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图 1 回收前后碳纤维形貌

Figure 1. Carbon fiber morphologies before and after recycling

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图 2 导电性试验试件成型参数

Figure 2. Forming parameters of conductivity test specimens

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图 3 导电性试验

Figure 3. Conductivity test

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图 4 不同掺量下回收碳纤维混凝土28天力学性能

Figure 4. 28 days mechanical properties of concretes with different recycling carbon fiber contents

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图 5 回收碳纤维混凝土破坏后断面及纤维间粘黏现象(实线圈代表纤维团聚，虚线圈代表孔洞)

Figure 5. Failure section of recycling carbon fiber reinforced concrete and fiber adhesion phenomenon (Solid lines ring represent fiber agglomeration, void lines ring represent hole)

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图 6 回收碳纤维的阻裂作用

Figure 6. Toughening and crack resistance of recycling carbon fiber

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图 7 不同龄期下回收碳纤维混凝土电阻率随掺量变化曲线

Figure 7. Curves of resistivity of recycling carbon fiber reinforced concrete at different ages

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图 8 碳纤维在混凝土中的导电传输路径

Figure 8. Conductive transmission path of carbon fiber in concrete

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图 9 回收碳纤维混凝土电阻率随含水率变化

Figure 9. Change of resistivity of recycling carbon fiber concrete with water content

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图 10 C—S—H凝胶在水饱和和无水状态下的微观结构(曲线、正方形、圆圈和三角分别代表C—S—H骨架片、层间孔隙水、凝胶孔隙水和其他非水惰性流体)^[26]

Figure 10. Micro-structure of C—S—H gel at water-saturated and water-free states (Curve, square, circle and triangle represent the C—S—H backbone sheet, interlayer pore water, gel pore water and other inert fluids rather than water, respectively)^[26]

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图 11 0wt%~0.5wt%掺量下烘干及吸水过程下回收碳纤维混凝土电阻率变化

Figure 11. Changes of resistivity of recycling carbon fiber concrete during drying and water absorption at 0wt%-0.5wt% dosage

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图 12 烘干及吸水过程下回收碳纤维混凝土电阻率变化

Figure 12. Change of resistivity of recycling carbon fiber concrete during drying and water absorption

M0-M25—Cement mortar specimens with nano carbon fiber contents of 0%, 1.0%, 1.5%, 2.0%, 2.5% cement volume; CF0% and CF0.2%—Cement mortar specimens with carbon fiber contents of 0% and 0.2% of cement mass

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表 1 回收碳纤维参数

Table 1. Parameters of recycling carbon fiber

Length/mm Diameter/μm Density/(g·cm⁻³) Tensile strength/MPa Tensile modulus/GPa Elongation/%

20 7 1.76 3530 230 1.5

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表 2 水泥化学成分

Table 2. Chemical composition of cement

Composition CaO SiO₂ Al₂O₃ Fe₂O₃ Na₂O K₂O MgO SO₃ TiO₂ Else

Content/wt% 61.83 19.68 4.72 3.66 0.43 1.27 1.31 0.05 2.73 2.23

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表 3 回收碳纤维混凝土配合比

Table 3. Proportion of recycled carbon fiber concrete kg/m³

Cement Water Sand Calculus Water reducer

474 120 667 1087 4.7

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