少层石墨烯对水泥净浆流动性能及力学性能的影响

何威; 许吉航; 焦志男

少层石墨烯对水泥净浆流动性能及力学性能的影响

何威^{1, 2, 3, ,},
许吉航^{1, 2, 3},
焦志男^{1, 2, 3}

1.
河北省土木工程绿色建造与智能运维重点实验室, 秦皇岛 066004
2.
河北省建筑低碳清洁供热技术创新中心, 秦皇岛 066004
3.
燕山大学　建筑工程与力学学院, 秦皇岛 066004

基金项目: 国家自然科学基金(51578477)

详细信息

通讯作者:
何威，博士，教授，研究方向为水泥基复合材料　 E-mail：hewei@ysu.edu.cn

中图分类号: TB332
计量
- 文章访问数: 118
- HTML全文浏览量: 75
- 被引次数: 0
出版历程
- 收稿日期: 2021-09-22
- 录用日期: 2021-11-03
- 修回日期: 2021-10-27
- 网络出版日期: 2021-11-26

Effect of few-layer graphene on the fluidity and mechanical properties of cement paste

Wei HE^{1, 2, 3
, ,},
Jihang XU^{1, 2, 3},
Zhinan JIAO^{1, 2, 3}

1.
Hebei Provincial Key Laboratory of Green Construction and Intelligent Operation in Civil Engineering, Qinhuangdao 066004, China
2.
Hebei Building Low-carbon Clean Heating Technology Innovation Center, Qinhuangdao 066004, China
3.
School of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao 066004, China

摘要

摘要: 系统研究了少层石墨烯(Few-layer graphene，FLG)对水泥净浆流动性能和力学性能(抗压强度和抗折强度)的影响，通过SEM、XRD、EDS剖析了FLG对净浆力学性能影响的作用机理。同时利用了AFM、Raman、SEM等技术表征了FLG的层数和结构。结果表明：FLG的层数在3~6层，呈现六角型蜂窝结构，有层间堆叠现象。FLG的掺入能降低净浆的流动性，净浆3 天和28 天抗压强度分别提升了27.84%和13.52%，3 天和28天抗折强度分别提升了12.92%和19.68%。FLG具有模板效应能够促进水泥水化产物的生长，改变水化晶体的形状、尺寸，使其有形成完整、致密的趋势，使净浆结构更加密实。
- 少层石墨烯 /
- 水泥净浆 /
- 流动性 /
- 力学性能 /
- 水化产物
Abstract: The effects of few-layer graphene ( FLG ) on the fluidity and mechanical properties ( compressive strength and flexural strength ) of cement paste were systematically studied. The mechanism of the effect of FLG on the mechanical properties of cement paste was analyzed by SEM, XRD and EDS. Meanwhile, the layers and structures of FLG were characterized by AFM, Raman and SEM techniques. The results show that the number of FLG layers is 3 ~ 6, showing a hexagonal honeycomb structure with interlayer stacking. The incorporation of FLG can reduce the fluidity of the paste. The 3 d and 28 d compressive strength values of the paste increase by 27.84 % and 13.52 %, respectively, and the 3 d and 28 d flexural strength values increase by 12.92 % and 19.68 %, respectively. The template effect of FLG can promote the growth of cement hydration products, change the shape and size of hydration crystals, and make it form a complete and dense trend, and make the paste structure more dense.
- few-layer graphene /
- cement paste /
- fluidity /
- mechanical properties /
- hydration products

HTML全文

图 1 少层石墨烯(FLG)模拟图及外观

Figure 1. Few-layer graphene (FLG) simulation diagram and appearance

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图 2 机械搅拌加超声分散制备FLG分散液

Figure 2. Preparation of FLG dispersion by mechanical agitation and ultrasonic dispersion

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图 3 FLG的微观形貌

Figure 3. Microstructure of FLG

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图 4 FLG的AFM相图

Figure 4. AFM phase diagram of graphene with few layers

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图 5 FLG高厚图

Figure 5. FLG height and thickness diagram

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图 6 FLG的Raman谱图

Figure 6. Raman spectrum of FLG

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图 7 FLG的XRD图谱

Figure 7. XRD pattern of FLG

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图 8 FLG的傅里叶变换红外光谱图

Figure 8. Fourier transform INFRARED spectra of FLG

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图 9 FLG/水泥净浆扩展度随FLG掺量变化趋势

Figure 9. Variation trend of FLG/PC net slurry expansion with FLG content

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图 10 FLG/水泥净浆3天、28天抗压强度随FLG掺量变化趋势

Figure 10. Variation trend of the 3-day and 28-day compressive strength of FLG/PC net slurry with FLG content

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图 11 FLG/水泥净浆3天、28天抗折强度随FLG掺量变化趋势

Figure 11. Variation trend of 3-day and 28-day flexural strength of FLG/PC net slurry with FLG content

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图 12 养护3天不同FLG掺量的 FLG/水泥净浆微观形貌

Figure 12. Microstructures of FLG/PC net slurry with different FLG contents after curing for 3 days

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图 13 养护28天不同FLG掺量的FLG/水泥净浆微观形貌

Figure 13. Microstructures of FLG/PC net slurry with different FLG contents after curing for 28 days

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图 14 不同掺量FLG /水泥净浆养护28天水化产物的元素能谱图

Figure 14. Elemental energy spectra of hydration products of FLG/ PC net slurry with different FLG dosages after curing for 28 days

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图 15 养护3天后不同FLG掺量的FLG/水泥净浆XRD图谱

Figure 15. XRD patterns of FLG/PC net slurry with different FLG contents after curing for 3 days

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图 16 养护28天后不同FLG掺量的FLG/水泥净浆XRD图谱

Figure 16. XRD patterns of FLG/PC net slurry with different FLG contents after curing for 28 days

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表 1 FLG参数

Table 1. FLG parameters

Type	Specific area/ (m²·g⁻¹)	Tap density/ (g·cm⁻³)	pH	Moisture/%	Mass fraction of carbon/%	Mass fraction of oxygen/%	Mass fraction of sulfur/%
FLG	458.55	0.022	7.10	0.54	≥98.0	＜1.0	＜0.1

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表 2 PO42.5水泥化学分析结果(wt%)

Table 2. Chemical analysis results of PO42.5 cement (wt%)

SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO		SO₃	Na₂O	K₂O	Cl^-	f-CaO	R₂O
21.47	7.17	3.11	60.04	2.90		2.77	0.11	0.70	0.024	0.57	0.57

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表 3 PO42.5水泥物理性能检测结果

Table 3. Physical performance test results of PO42.5 cement

Density / (g·cm⁻³)	Degree of powder		Setting time			Stability	Flexural strength /MPa		Compressive strength /MPa
Density / (g·cm⁻³)	Specific surface area /(m²·kg⁻¹)	80μ/%	Consistency/%	Initial setting/min	Final set/min	Ray type method/mm	3 d	28 d	3 d	28 d
3.06	351	0.28	28.0	170	235	Qualified	5.6	8.9	29.0	57.3

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表 4 FLG/水泥净浆复合材料试件编号

Table 4. Specimen number of FLG/PC net slurry composite

FLG content/wt%	0	0.02	0.04	0.06	0.08	0.1	0.5	1
Specimen number	0 wt% FLG/PC	0.02 wt% FLG/PC	0.04 wt% FLG/PC	0.06 wt% FLG/PC	0.08 wt% FLG/PC	0.1 wt% FLG/PC	0.5 wt% FLG/PC	1 wt% FLG/PC
Note: PC stands for PO42.5 ordinary Portland cement.

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表 5 养护28天FLG/水泥净浆复合材料水化产物的元素组成及质量分数

Table 5. Elemental composition and mass fraction of hydration products of FLG/PC net slurry composite after curing for 28 days

Element type	0 wt%FLG/PC	0.04 wt%FLG/PC	1 wt%FLG/PC
C	8.17	13.04	6.70
O	50.74	51.77	43.84
Mg	0.36	0.69	0.47
Al	2.73	1.74	4.57
Si	7.89	7.80	10.51
S	1.71	1.21	1.50
K	1.02	1.66	1.95
Ca	27.38	22.09	30.46

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