三维石墨烯-碳纳米管/水泥净浆的压敏性能

刘金涛; 黄存旺; 杨杨; 蔡倩妮

doi:10.13801/j.cnki.fhclxb.20210331.001

三维石墨烯-碳纳米管/水泥净浆的压敏性能

doi: 10.13801/j.cnki.fhclxb.20210331.001

刘金涛^{1, 2,},
黄存旺^1,,
杨杨^{1, 2, ,},
蔡倩妮^1,

1.
浙江工业大学　土木工程学院，杭州 310023
2.
浙江省工程结构与防灾减灾技术研究重点实验室，杭州 310023

基金项目: 浙江省自然科学基金 (LY21E080016)；浙江省重点研发计划项目(2021C01060)

详细信息

通讯作者:
杨杨，工学博士，教授，博士生导师，研究方向为高性能混凝土材料　E-mail：yangyang@zjut.edu.cn

中图分类号: TQ172.1; TB332
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- 文章访问数: 668
- HTML全文浏览量: 321
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-15
- 修回日期: 2021-03-14
- 录用日期: 2021-03-24
- 网络出版日期: 2021-03-31
- 刊出日期: 2022-01-15

Piezoresistivity of three dimensional graphene-carbon nanotubes/cement paste

LIU Jintao^{1, 2
,},
HUANG Cunwang^1
,,
YANG Yang^{1, 2
, ,},
CAI Qianni^1
,

1.
College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2.
Key Laboratory of Civil Engineering Structure & Disaster Prevention and Mitigation Technology of Zhejiang Province, Hangzhou 310023, China

摘要

摘要: 为了探索三维石墨烯-碳纳米管(G-CNTs)/水泥净浆的压敏性能，采用四电极法研究了荷载作用下G-CNTs/水泥净浆的电阻率变化，并分析不同G-CNTs掺量、加载幅度、加载速度以及恒定荷载对电阻率变化的影响。研究表明：随着G-CNTs掺量的增加，电阻率呈先减小后稳定的变化趋势，在G-CNTs掺量由0.2wt%增加至1.6wt%时，电阻率下降51.8%；电阻率与温度呈负相关；G-CNTs掺量高于0.8wt%时可以显著提高水泥净浆的压敏性能，且电阻率变化率与应力应变有明显的对应关系，1.2wt%G-CNTs掺量下试件的应力灵敏系数和应变灵敏系数分别为2.3%/MPa和291；G-CNTs/水泥净浆电阻率变化率幅值随着加载幅度增大而相应增加，其电阻率变化率曲线在不同加载速度以及恒定荷载作用下均与应力-应变曲线一一对应，具有良好的压敏特性。
- 三维石墨烯-碳纳米管 /
- 电阻率 /
- 压敏性能 /
- 水泥基材料 /
- 灵敏系数
Abstract: In order to explore the piezoresistivity of three dimensional graphene-carbon nanotubes (G-CNTs)/cement paste, the four-electrode method was used to study the resistivity change of the G-CNTs/cement paste under load. The influence of G-CNTs content, loading amplitude, loading speed and constant load on the resistivity change was analyzed. The results show that the resistivity decreases first and then tends to stabilize with the increase of the G-CNTs content. When the G-CNTs content increases from 0.2wt% to 1.6wt%, the resistivity decreases by 51.8%. The resistivity is negatively correlated with temperature. When the G-CNTs content is higher than 0.8wt%, the piezoresistivity of the cement paste is significantly improved, and the rate of change in resistivity has an obvious corresponding relationship with the stress-strain. The stress sensitivity coefficient and the strain sensitivity coefficient of the specimens with 1.2wt% G-CNTs are 2.3%/MPa and 291, respectively. The amplitude of the rate of change in resistivity of G-CNTs/cement paste increases as the loading amplitude increasing. The rate of change in resistivity curve corresponding to the stress-strain changes under different loading speeds and constant load exhibits good piezoresistivity.
- three dimensional graphene-carbon nanotube /
- resistivity /
- piezoresistivity /
- cement-based materials /
- sensitivity coefficient

HTML全文

图 1 三维石墨烯-碳纳米管微观形貌及其粒径分布

Figure 1. Microstructure and particle size distribution of 3D graphene/carbon nanotubes

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图 2 试件压敏性能测试

Figure 2. Piezoresistivity test for specimens

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图 3 三维石墨烯-碳纳米管/水泥净浆电阻率随G-CNTs掺量的变化关系

Figure 3. Relationship between the resistivity of three dimensional graphene-carbon nanotubes/cement paste and G-CNTs content

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图 4 三维石墨烯-碳纳米管/水泥净浆复合材料电阻率随温度的变化关系

Figure 4. Relationship between the resistivity of three dimensional graphene-carbon nanotubes/cement slurry composites and the temperature

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图 5 三维石墨烯-碳纳米管/水泥净浆复合材料电阻率变化率与应力-应变关系

Figure 5. Relationship between the resistivity change rate of three-dimensional graphene-carbon nanotubes/cement slurry composites and stress-strain

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图 6 各组三维石墨烯-碳纳米管/水泥净浆复合材料应力-应变灵敏系数

Figure 6. Stress-strain sensitivity coefficients of each group of three-dimensional graphene-carbon nanotubes/cement slurry composites

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图 7 不同加载幅值下三维石墨烯-碳纳米管/水泥净浆复合材料的电阻率变化率与应力-应变关系

Figure 7. Relationship between the resistivity change rate of three-dimensional graphene-carbon nanotubes/cement slurry composites and stress-strain under different loading amplitudes

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图 8 不同加载幅值下各组三维石墨烯-碳纳米管/水泥净浆复合材料的电阻率变化率值

Figure 8. Resistivity change rate of each group of three-dimensional graphene-carbon nanotubes/cement slurry composites under different loading amplitudes

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图 9 不同加载速率下三维石墨烯-碳纳米管/水泥净浆复合材料的电阻率变化率与应力-应变关系

Figure 9. Relationship between the resistivity change rate of three-dimensional graphene-carbon nanotubes/cement slurry composites and stress-strain under different loading speeds

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图 10 恒载下1.2wt%G-CNTs/C电阻率变化率与应力-应变关系

Figure 10. Relationship between the resistivity change rate of 1.2wt%G-CNTs/C and stress-strain under constant load

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表 1 三维石墨烯-碳纳米管(G-CNTs)的性能参数

Table 1. Properties of three dimensional graphene-carbon nanotubes (G-CNTs)

Purity	Layer	Median grain diameter/μm	Specific surface area /(m²·g⁻¹)	CNTs’ diameter/nm	Volume mean particle size/μm
>90%	< 30	3-6	6.23	50-80	6.307

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表 2 G-CNTs/水泥净浆配合比

Table 2. Mixture proportions of G-CNTs/cement slurry

Group	Cement/g	Surfactant/g	G-CNTs/g	G-CNTs/wt%	Water/g	Water reducer/g
R	1500	4	0	0	600	0
0.2wt%G-CNTs/C	1500	4	3	0.2	600	0.10
0.4wt%G-CNTs/C	1500	4	6	0.4	600	0.13
0.8wt%G-CNTs/C	1500	4	12	0.8	600	0.16
1.2wt%G-CNTs/C	1500	4	18	1.2	600	0.18
1.6wt%G-CNTs/C	1500	4	24	1.6	600	0.50
2.0wt%G-CNTs/C	1500	4	30	2.0	600	0.84
2.4wt%G-CNTs/C	1500	4	36	2.4	600	1.50
Note：R—Group of undoped cement slurry

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表 3 不同导电相复合水泥基材料灵敏系数

Table 3. Sensitivity coefficients of cement-based materials reinforced with different conducting materials

Ref.	Material	Content	Strain sensitivity factor/(%·MPa⁻¹)	Stress sensitivity factor
This study	G-CNTs	1.2wt%	2.30	291
Han et al.^[8]	Carbon fiber	—	1.35	227
Zhai et al. ^[30]	GO	2.0wt%	1.28	147.8
Sun et al. ^[31]	Graphene	5.0vol%	0.78	156
Luo et al. ^[32]	MWCNT	1.0wt%	1.47	132
Yu et al. ^[33]	MWCNT	0.1wt%	1.33	—
Liu et al. ^[18]	Graphene	0.15vol%	—	37.78

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