磁场诱导对磁性石墨烯改性水泥净浆抗压强度的影响研究

郑城; 王迎豪; 张逸舟; 苏俊儒; 张惠一; 胡兵兵; 袁小亚

磁场诱导对磁性石墨烯改性水泥净浆抗压强度的影响研究

郑城¹,
王迎豪¹,
张逸舟¹,
苏俊儒¹,
张惠一²,
胡兵兵¹,
袁小亚^{1, 3, ,}

1.
重庆交通大学　材料科学与工程学院, 重庆 400074
2.
重庆交通大学　土木工程学院, 重庆 400074
3.
重庆诺奖二维材料研究院有限公司, 重庆 400714

基金项目: 国家自然科学基金项目(51402030)；重庆市技术创新与应用发展专项重点项目(CSTB2022TIAD-KPX0031)；重庆市级引导区县科技发展专项资金(JSYY2023010)；重庆市研究生导师团队建设项目(JDDSTD2022006)；重庆交通大学校企合作项目(cqjt-2022-036)；重庆诺奖二维材料研究院科技项目(C2DMI-RD-230616-01)

详细信息

通讯作者:
袁小亚，博士，教授，博士生导师，研究方向为纳米复合材料、建筑功能材料、高性能水泥混凝土等领域　E-mail: yanxy@cqjtu.edu.cn

中图分类号: TB333；TU528
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- 文章访问数: 25
- HTML全文浏览量: 18
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-10
- 修回日期: 2024-08-24
- 录用日期: 2024-09-03
- 网络出版日期: 2024-09-16

Study on the effect of magnetic field induction on the compressive strength of magnetic graphene-modified cement paste

1.
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2.
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
3.
Chongqing 2 d Materials Institute of China, Chongqing 400714, China

Funds: National Natural Science Foundation of China (51402030); Chongqing Municipal Technology Innovation and Application Development Special Key Projects (CSTB2022TIAD-KPX0031); Special Funds for Guiding Science and Technology Development of Districts and Counties in Chongqing Municipality (JSYY2023010); Chongqing Postgraduate Tutor Team Building Project (JDDSTD2022006); Chongqing Jiaotong University School-Enterprise Co-operation Project (cqjt-2022-036); Chongqing Nobel Prize 2D Materials Research Institute Science and Technology Project (C2DMI-RD-230616-01)

摘要

摘要: 二维石墨烯(G)纳米片对水泥基材料有显著的增强效果，但通常情况下G是杂乱无章地分布在水泥基材料中。为了更好地发挥G的强化作用，本研究通过一步共沉淀法将Fe₃O₄纳米颗粒附着热还原氧化石墨烯(RGO)纳米片上制备了磁性纳米复合材料 Fe₃O₄@ RGO(MGO)，通过施加外磁场(MF)使不同掺量的MGO纳米片在水泥净浆(CP)中沿一定方向排列，分别通过测试垂直和平行于磁场方向上的硬化水泥净浆的抗压强度。研究结果表明经磁场诱导后掺入不同量MGO的水泥净浆平行于磁场方向的截面抗压强度均大于垂直于磁场方向的截面抗压强度；当MGO掺量为0.1%时，在平行于磁场方向的截面抗压强度比垂直于磁场方向的截面抗压强度高12.20%。说明MGO纳米片经磁场诱导后发生了定向排列，水泥水化产物更多的在平行于磁场方向上规整排列生长。本研究通过外部磁场诱导调控石墨烯纳米片定向排布，为特定用途下实现更高强度的水泥基材料提供了一种有效途径。
- 四氧化三铁 /
- 石墨烯 /
- 磁场 /
- 定向排列 /
- 力学性能 /
- 水泥净浆
Abstract: Two-dimensional graphene (G) nanosheets have a significant enhan cement effect on cement-based materials, but generally G is distributed haptically in cement-based materials. In order to better exert the strengthening effect of G, the magnetic nanocomposite Fe₃O₄@RGO (MGO) was prepared by one-step co-precipitation method by adhering Fe₃O₄ nanoparticles to thermal-reduced graphene oxide (RGO) nanosheets. By applying an external magnetic field (MF), the MGO nanosheets with different contents were arranged in a certain direction in the cement paste. The compressive strength of the hardened cement paste perpendicular and parallel to the magnetic field was tested respectively. The results show that the compressive strength of the cement paste mixed with different amounts of MGO in the direction parallel to the magnetic field is greater than that perpendicular to the magnetic field; when the content of MGO is 0.1%, the compressive strength of the section parallel to the magnetic field is 12.20% higher than that perpendicular to the magnetic field. The results indicated that the MGO nanosheets were oriented after induction by magnetic field, and the hydration products of cement grew in a regular arrangement parallel to the magnetic field. This study provides an effective way to achieve higher strength cement-based materials for specific applications by regulating the orientation of graphene nanosheets induced by an external magnetic field.
- Fe₃O₄ /
- graphene /
- magnetic fields /
- directional arrangement /
- mechanical property /
- cement paste

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图 1 磁场诱导的MGO水泥净浆制备流程

Figure 1. Magnetic field induced preparation process of MGO-cement paste

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图 2 GO和MGO的拉曼光谱图

Figure 2. Raman spectra of GO and MGO

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图 3 (a) GO、MGO的XPS全谱图 (b) GO、MGO的XPS C 1s谱图 (c) MGO的XPS Fe 2p轨道分峰图和 (d) MGO的XPS O 1s 谱图

Figure 3. (a)XPS survey spectra of GO and MGO(b)XPS C 1s spectra of GO and MGO (c) XPS Fe 2p spectrum of MGO and (d) XPS O 1s spectrum of MGO

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图 4 MGO在不同倍率下的SEM图像

Figure 4. SEM images of MGO at different magnification

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图 5 (a)，(b)，(c) MGO在不同倍率下的TEM图像；(d) MGO的EDS分布图

Figure 5. (a), (b), (c) TEM images of MGO at different magnification; (d) elemental mappings of MGO

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图 6 MGO分散液的(a、b)稳定性、(c)磁响应

Figure 6. (a、b) stability and (c) magnetic response of MGO aqueous dispersion

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图 7 不同 MGO掺量对水泥净浆流动度的影响

Figure 7. Effect of different MGO contents on cement paste fluidity

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图 8 同一掺量MGO在平行于磁场方向截面较垂直于磁场方向截面的抗压强度增长率

Figure 8. Growth rate of compressive strength of the same contents of MGO in the cross section parallel compared to perpendicular to the magnetic field direction

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图 9 不同 MGO掺量下28 d水泥净浆XRD 图谱

Figure 9. XRD pattern of cement paste at 28 days with different MGO content

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图 10 MGO调控水泥水化产物的机制分析图

Figure 10. Schematic diagram of the functional role of MGO in cement paste

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表 1 水泥的化学成分

Table 1. Chemical composition of cement

Mineral	Al₂O₃	SiO₂	Fe₂O₃	CaO	MgO	SO₃	NaO	f-CaO
Content / wt%	4.47	21.50	3.37	65.84	3.18	0.30	0.49	0.78
Note: f-CaO−Free calcium oxide.

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表 2 不同MGO掺量的水泥净浆配合比

Table 2. Mix ratios of cement paste with different contents of MGO

Sample^①	Cement/g	PCE^②/g	water/g	MGO^③/wt%
0 wt%MGO/CP 0.05 wt%MGO/CP_ab 0.07 wt%MGO/CP_ab 0.09 wt%MGO/CP_ab 0.10 wt%MGO/CP_ab 0.30 wt%MGO/CP_ab 0.50 wt%MGO/CP_ab	470 470 470 470 470 470 470	0.5 0.5 0.5 0.5 0.5 0.5 0.5	149.2 149.2 149.2 149.2 149.2 149.2 149.2	/ 0.05 0.07 0.09 0.10 0.30 0.50
Notes：①X wt% MGO/CP denotes a cement paste specimen with a content of X% MGO；CP stands for cement paste； The subscript a indicates parallel to the direction of the magnetic field, and b indicates perpendicular to the direction of the magnetic field.②PCE is polycarboxylic acid water reducing agent；MGO is Fe₃O₄@ RGO.③Content of MGO is its mass ratio to Cement.

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表 3 不同掺量的MGO对水泥净浆抗压强度的影响

Table 3. Effect of different MGO contents on compressive strength of cement paste

Sample	Compressive strength(MPa)/growth rate(%) Perpendicular to the magnetic field		Compressive strength(MPa)/growth rate(%) Parallel to the magnetic field
Sample	7 d	28 d	7 d	28 d
0wt%MGO/CP 0.05wt%MGO/CP 0.07wt%MGO/CP 0.09wt%MGO/CP 0.10wt%MGO/CP 0.30wt%MGO/CP 0.50wt%MGO/CP	39.1/0 40.0/2.30 42.1/7.67 45.3/15.86 46.8/19.69 44.1/12.79 42.4/8.44	53.1/0 54.9/3.39 55.8/5.08 57.4/8.10 58.2/9.60 56.1/5.65 55.1/3.77	39.1/0 41.1/5.12 44.5/13.81 48.2/23.27 50.7/29.67 45.0/15.09 42.2/7.93	53.1/0 56.8/6.97 59.6/12.24 62.4/17.51 65.3/22.98 64.1/20.72 62.6/17.89

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