多壁碳纳米管增强混凝土的抗氯离子渗透性能

施韬; 赵启帆; 胡卓君; 刘艳明

doi:10.13801/j.cnki.fhclxb.20211014.001

多壁碳纳米管增强混凝土的抗氯离子渗透性能

doi: 10.13801/j.cnki.fhclxb.20211014.001

施韬^{1, 2, ,},
赵启帆¹,
胡卓君¹,
刘艳明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: 国家自然科学基金面上项目(52078460；51778582)；硅酸盐建筑材料国家重点实验室开放基金重点项目(SYSJJ2020-06)

详细信息

通讯作者:
施韬，博士，教授，博士生导师，研究方向为先进水泥基材料　E-mail: shitao@zjut.edu.cn

中图分类号: TU528
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-03
- 修回日期: 2021-09-28
- 录用日期: 2021-09-29
- 网络出版日期: 2021-10-15
- 刊出日期: 2022-08-22

Chloride ion penetration resistance of multi-walled carbon nanotubes reinforced concrete

SHI Tao^{1, 2
, ,},
ZHAO Qifan¹,
HU Zhuojun¹,
LIU Yanming¹

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: 采用快速氯离子迁移系数(RCM)法和自然浸泡法对多壁碳纳米管(MWCNTs)增强混凝土的抗氯离子渗透性能进行研究，测量混凝土试件纵向断面上的氯离子扩散深度，据此计算氯离子扩散系数。试验结果表明：当MWCNTs掺量为0.15wt%时，混凝土28天的氯离子扩散深度、氯离子扩散系数分别降低了25.7%、19.1%；在4种不同侵蚀龄期的自然浸泡下，掺入MWCNTs的混凝土，内部氯离子浓度始终低于对照组。结合两种方法分析得出：混凝土内部各深度的自由氯离子浓度随着MWCNTs掺量的增加而降低，致使氯离子扩散系数随着MWCNTs掺量的增加而变小，MWCNTs的掺入提高了混凝土的抗氯离子渗透性能。此外，通过SEM和压汞(MIP)测试进一步探究MWCNTs对混凝土抗氯离子渗透性能的微观增强机制，分析结果表明，MWCNTs具有一定的桥接和填充效应，这可能使混凝土裂缝扩展受到抑制、孔隙更加细化，从而改善混凝土的微观结构，提高混凝土的抗氯离子渗透性能。
- 混凝土 /
- 多壁碳纳米管 /
- 氯离子扩散深度 /
- 氯离子扩散系数 /
- 氯离子浓度 /
- 微观结构
Abstract: The rapid chloride migration coefficient (RCM) method and the natural immersion method were used to study the chloride ion penetration resistance of multi-walled carbon nanotubes (MWCNTs) reinforced concrete. The chloride ion diffusion depth on the longitudinal section of the concrete specimen was measured, and the chloride ion diffusion coefficient was calculated based on this. The test results show that when the content of MWCNTs is 0.15wt%, the chloride ion diffusion depth and chloride ion diffusion coefficient of concrete at 28 days are reduced by 25.7% and 19.1%, respectively. Under four different erosion ages of natural soaking, mixing in the concrete of MWCNTs, the internal chloride ion concentration is always lower than that of the control group. Combining the analysis of the two methods, it is concluded that the free chloride ion concentration at each depth of the concrete decreases with the increase of the MWCNTs content, so that the chloride diffusion coefficient decreases with the increase of the MWCNTs content, and the incorporation of MWCNTs improves the resistance of concrete to chloride ion penetration. In addition, through SEM and mercury intrusion (MIP) tests, the microscopic enhancement mechanism of MWCNTs on the anti-chloride ion permeability of concrete was further explored. The analysis results show that MWCNTs have a certain bridging and filling effect, which may cause concrete crack propagation to be affected, inhibit and refine the pores, thereby improving the microstructure of concrete and improving the resistance of concrete to chloride ion penetration.
- concrete /
- multi-walled carbon nanotubes /
- chloride ion diffusion depth /
- chloride ion diffusion coefficient /
- chloride ion concentration /
- microstructure

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图 1 MWCNTs的TEM图像

Figure 1. TEM images of MWCNTs

下载: 全尺寸图片幻灯片

图 2 快速氯离子迁移系数(RCM)法装置示意图

Figure 2. Schematic diagram of rapid chloride migrationcoefficient (RCM) method device

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图 3 图像处理测定方法示意图

Figure 3. Schematic diagrams of images processing measurement method

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图 4 不同MWCNTs掺量混凝土的28天氯离子扩散深度和非稳态氯离子迁移系数$ {D}_{\mathrm{R}\mathrm{C}\mathrm{M}} $

Figure 4. Chloride diffusion depth and unstable chloride ion diffusion coefficient $ {D}_{\mathrm{R}\mathrm{C}\mathrm{M}} $ of concrete with different MWCNTs contents at 28 days

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图 5 30天、60天、90天和120天后不同MWCNTs掺量混凝土的不同深度自由氯离子浓度

Figure 5. Free chloride ion concentration at different depths of concrete with different MWCNTs contents after 30 days, 60 days, 90 days and 120 days

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图 6 不同MWCNTs掺量混凝土的孔隙累计进汞量曲线 (a) 和孔径分布曲线 (b)

Figure 6. Cumulative mercury penetration curves (a) and pore size distribution curves (b) of concrete with different MWCNTs contents

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图 7 不同MWCNTs掺量混凝土的孔径结构分布

Figure 7. Pore size distribution of concrete with different MWCNTs contents

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图 8 28天不同MWCNTs掺量混凝土的SEM图像

Figure 8. SEM images of concrete with different MWCNTs contents in 28 days

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表 1 水泥的化学组成

Table 1. Chemcial compositions of cement wt%

Material	CaO	SiO₂	Al₂O₃	Fe₂O₃	SO₃	MgO	Loss
Cement	64.47	22.18	4.51	3.15	2.56	1.2	1.36

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表 2 多壁碳纳米管(MWCNTs)浆料的参数

Table 2. Parameters of multi-walled carbon nanotubes (MWCNTs) aqueous paste

Model	Medium	Medium content/wt%	CNTs model	CNTs content/wt%	Dispersant	Dispersant content/wt%
TNWPM-M8	Water	88	TNIM8	10	TNWDIS	2

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表 3 MWCNTs的物理特性

Table 3. Physical parameters of MWCNTs

Model	Outer diameter/nm	Purity/wt%	Length/μm	Special surface area/(m²·g⁻¹)	Tap density/(g·cm⁻³)
TNIM8	30-80	>95	5-10	>60	0.18

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表 4 不同MWCNTs掺量混凝土的配合比

Table 4. Mix proportions of concrete with different contents of MWCNTs

Specimen group	MWCNTs /wt%	TNWDIS /wt%	Water /kg	Cement /kg	Sand /kg	Aggregate /kg	Slump /mm
C	0.00	0.03	230	437	656	1077	80
0.05wt%MWCNTs/C	0.05	0.03	230	437	656	1077	80
0.10wt%MWCNTs/C	0.10	0.03	230	437	656	1077	80
0.15wt%MWCNTs/C	0.15	0.03	230	437	656	1077	80

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表 5 不同MWCNTs掺量混凝土的孔径结构参数

Table 5. Pore structure parameters of concrete with different MWCNTs contents

Specimen group	Harmless pore (<20 nm)/%	Less harmful pore (20-50 nm)/%	Harmful pore (50-200 nm)/%	More harmful pore (>200 nm)/%
C	36.67	20.08	27.23	16.01
0.05wt%MWCNTs/C	38.34	31.74	21.01	8.91
0.10wt%MWCNTs/C	40.84	32.18	19.39	7.60
0.15wt%MWCNTs/C	41.10	38.81	11.04	9.06

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