纳米氧化石墨烯和乙烯-醋酸乙烯酯胶粉对水泥砂浆力学性能及微观结构的影响

赵辛源; 乔宏霞; 李少飞; 魏智强; 曹辉; 叶付凯; 葸玲玲

纳米氧化石墨烯和乙烯-醋酸乙烯酯胶粉对水泥砂浆力学性能及微观结构的影响

赵辛源^{1, 2},
乔宏霞^{1, 2, 3, ,},
李少飞^{1, 2},
魏智强^{1, 4},
曹辉^{1, 2},
叶付凯^{1, 2},
葸玲玲^{1, 2}

1.
兰州理工大学土木工程学院, 兰州 730050
2.
甘肃省先进土木工程材料工程研究中心, 兰州 730050
3.
兰州理工大学西部土木工程防灾减灾教育部工程研究中心, 兰州 730050
4.
兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050

基金项目: 国家自然科学基金(52268042)；甘肃省自然科学基金(22JR5RA253)

详细信息

通讯作者:
乔宏霞，博士，教授，博士生导师，研究方向为土木工程材料　E-mail:qiaohongxia@lut.edu.cn

中图分类号: TU528.1
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- 文章访问数: 59
- HTML全文浏览量: 25
- 被引次数: 0
出版历程
- 收稿日期: 2024-06-25
- 修回日期: 2024-07-22
- 录用日期: 2024-08-12
- 网络出版日期: 2024-08-30

Effects of nano-graphene oxide and ethylene-vinyl acetate rubber powder on mechanical properties and microstructure of mortar

ZHAO Xinyuan^{1, 2},
QIAO Hongxia^{1, 2, 3
, ,},
LI Shaofei^{1, 2},
WEI Zhiqiang^{1, 4},
CAO Hui^{1, 2},
YE Fukai^{1, 2},
XI Lingling^{1, 2}

1.
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2.
Gansu Advanced Civil Engineering Materials Engineering Research Center, Lanzhou 730050, China
3.
Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China
4.
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology,Lanzhou 730050, China

Funds: National Natural Science Foundation of China (52268042); Natural Science Foundation of Gansu Province (22JR5RA253)

摘要

摘要: 本文采用纳米氧化石墨烯(GO)和乙烯-醋酸乙烯酯胶粉(EVA)对普通水泥砂浆进行改性，利用FTIR、XRD、TG、NMR及SEM等测试手段，在材料的化学组成、孔隙结构和微观形貌等方面揭示了GO和EVA对水泥砂浆力学性能的影响机制。结果表明：分散良好的GO降低了新拌砂浆的流动度，EVA的加入改善了这一现象；单掺0.03wt% GO的试件力学性能达到最佳，7 d龄期的抗压、抗折强度较基准组(PC)试件提高了24.1%和31%。GO和EVA复掺后，掺量分别控制在0.03wt%和4wt%时试件的28 d力学性能最优，抗压、抗折强度分别为72 MPa和12 MPa，较PC试件提高了25.9%和33.3%。微观试验结果表明：GO的成核效应加速了水泥水化进程并且可以调节花状水化晶体的产生和生长，从而细化试样孔径分布，良好的填充效应使得孔隙结构变得更加致密。EVA早期形成网状薄膜阻碍水泥水化进程，在水化后期，充分发育的网状薄膜与水泥浆体形成互穿网络结构，促进孔隙结构致密化。二者发挥协同作用，显著增强水泥砂浆力学性能。
- 纳米氧化石墨烯 /
- 乙烯-醋酸乙烯酯胶粉 /
- 水泥砂浆 /
- 力学性能 /
- 孔隙结构
Abstract: In this study, nano-graphene oxide (GO) and ethylene-vinyl acetate rubber powder (EVA) were used to modify ordinary cement mortar, and the mechanism of the influence of GO and EVA on the mechanical properties of cement mortar was revealed in terms of the chemical composition, pore structure, and microscopic morphology of the materials by using testing methods such as FTIR, XRD, TG, NMR, and SEM. The results indicate that the well-dispersed GO reduces the fluidity of fresh mortar, and this effect could be mitigated by incorporating EVA. The mechanical properties of specimens containing 0.03wt% GO alone were found to be optimal, with a 24.1% increase in compressive strength and a 31% increase in flexural strength at 7 days compared to the benchmark group (PC). Subsequent to the composite infusion of GO and EVA, the 28-day mechanical properties of the resultant specimens exhibit peak values at a GO dosage of 0.03wt% and an EVA dosage of 4wt% weight percent, respectively. Notably, the compressive and flexural strengths recorded are 72 MPa and 12 MPa, demonstrating enhancements of 25.9% and 33.3% when compared to the properties of the PC specimens. The microscopic test outcomes demonstrate that: the nucleation effect of GO accelerates the cement hydration process and can modulate the generation and growth of flower-like hydration crystals, thus refining the pore size distribution of the specimen, and the good filling effect makes the pore structure become denser. The establishment of reticulation film in the early stage of EVA impedes the hydration process of the cement, and in the late stage of hydration, the fully developed reticulation film forms an interpenetrating network with the cement paste, facilitating the pore structure and densification. The cooperative interaction of the two significantly enhances the mechanical properties of the cement mortar.
- nano-graphene oxide /
- ethylene-vinyl acetate rubber powder /
- cement mortar /
- mechanical property /
- pore structure

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图 1 EVA的SEM图像和GO的SEM图像

Figure 1. EVA SEM images and GO SEM images

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图 2 复掺试件溶液配制过程示意图

Figure 2. Compound mixing specimen solution preparation process schematic diagram

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图 3 跳桌法测试新拌浆体流动度

Figure 3. Jumping table method to test the flow of freshly mixed slurry

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图 4 力学性能测试

Figure 4. Mechanical performance test

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图 5 PC、单掺EVA、单掺GO、复掺GO和EVA组新拌浆体流动度

Figure 5. The fluidity of the newly mixed slurry in the PC, single-doped EVA, single-doped GO, multi-doped GO and EVA groups

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图 6 PC、单掺EVA、单掺GO、复掺GO和EVA组试件规定龄期力学性能

Figure 6. The mechanical properties of PC, EVA, GO, GO and EVA group specimens at 7 d and 28 d ages were tested.

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图 7 PC、单掺EVA、单掺GO、复掺GO和EVA组试件压折比

Figure 7. The compression/flexion ratio of PC, single-doped EVA, single-doped GO, double-doped GO and EVA group specimens.

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图 8 PC、E2、G2和G2 E2组试件的28 d FTIR图

Figure 8. 28 d FTIR plots of PC, E2, G2 and G2 E2 specimens

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图 9 PC、E2、G2和G2 E2组试件28 d XRD图谱

Figure 9. 28 d XRD spectra of specimens of groups PC, E2, G2 and G2 E2

Note: "AFt" is ettringite; "CH" is calcium hydroxide；"C₂S+C₃S" is dicalcium silicate and tricalcium silicate

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图 10 PC、E2、G2和G2 E2组试件热分析测试图

Figure 10. Thermal analysis test charts for specimens in groups PC, E2, G2 and G2 E2

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图 11 PC、E2、G2和G2 E2组试件T₂谱

Figure 11. T₂ spectra of specimens of groups PC, E2, G2 and G2 E2

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图 12 PC、E2、G2和G2 E2组试件不同龄期孔隙率图和孔径分布图

Figure 12. Porosity diagram and pore size distribution at different ages for PC, E2, G2 and G2 E2 specimens

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图 13 G2 E2组试件不同龄期SEM图像

Figure 13. SEM images of G2 E2 specimens at different ages

Note: "FA" is grade II fly ash; "C-S-H" is calcium silicate hydrate.

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图 14 G2E2组试件水化产物处的EDS

Figure 14. EDS of hydration products of G2E2 group specimens

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表 1 水泥技术指标

Table 1. Cement technical indicators

Strength grade	Stability	Compressive strength/MPa		Flexural strength/MPa		Solidification time/min
Strength grade	Stability	3 d	28 d	3 d	28 d	Condensation	Congeal
52.5	Eligible	30.2	56	6.1	8.8	151	212

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表 2 EVA技术指标

Table 2. EVA technical indicators

Performances	Index
Solid content/%	99±1
Apparent density/(g·L⁻¹)	540±50
Appearance	White powder
Stable system	Polyvinyl alcohol
Minimum film forming temperature/℃	4
Main particle sizes/μm	0.5-8

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表 3 GO技术指标

Table 3. GO technical indicators

Performances	Index
Fineness	＞95wt%
Layer diameter	1-30 μm
Appearance	Brownish-black powder
Storey	1-3

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表 4 PC、单掺EVA、单掺GO试件

Table 4. PC, single-doped EVA, single-doped GO specimens

Number	Water-to-cement ratio	FA/%	GO/%	EVA/%	Grit ratio	GO: PCE	Defoamer/g
PC	0.35	10	0	0	1:1.5	0	0
E1	0.35	10	0	2	1:1.5	0	0.10
E2	0.35	10	0	4	1:1.5	0	0.10
E3	0.35	10	0	6	1:1.5	0	0.10
G1	0.35	10	0.01	0	1:1.5	1：2	0
G2	0.35	10	0.03	0	1:1.5	1：2	0
G3	0.35	10	0.05	0	1:1.5	1：2	0
Notes: FA represents grade II fly ash; GO represents nano-graphene oxide; EVA stands for ethylene-vinyl acetate rubber powder; PCE is powder polycarboxylic acid water reducing agent; The same below. PC is the reference group specimen; "E1", "E2", "E3"represent the content of EVA is 2%, 4% and 6%, respectively; "G1", "G2", "G3" represent the content of GO is 0.01%, 0.03% and 0.05%, respectively.

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表 5 复掺GO和EVA试件

Table 5. Compound GO and EVA specimens

Number	Water-to-cement ratio	FA/%	GO/%	EVA/%	Grit ratio	Defoamer/g
G1 E1	0.35	10	0.01	2	1:1.5	0.10
G1 E2	0.35	10	0.01	4	1:1.5	0.10
G1 E3	0.35	10	0.01	6	1:1.5	0.10
G2 E1	0.35	10	0.03	2	1:1.5	0.10
G2 E2	0.35	10	0.03	4	1:1.5	0.10
G2 E3	0.35	10	0.03	6	1:1.5	0.10
G3 E1	0.35	10	0.05	2	1:1.5	0.10
G3 E2	0.35	10	0.05	4	1:1.5	0.10
G3 E3	0.35	10	0.05	6	1:1.5	0.10
Note: "G1 E1"represents GO and EVA doping of 0.01% and 2%, respectively.

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表 6 PC、E2、G2和G2 E2组试件不同龄期特征峰面积比

Table 6. Ratio of characteristic peak area at different ages of specimens in groups PC, E2, G2 and G2 E2

Age	Number	Total area of peaks	Main peak		Sub-peak 1		Sub-peak 2
Age	Number	Total area of peaks	Peak area	Proportion/%	Peak area	Proportion/%	Peak area	Proportion/%
7 d	PC	2851.39	2622.54	91.97	178.21	6.25	50.63	1.78
7 d	E2	2643.29	2395.97	90.64	197.75	7.48	49.56	1.88
7 d	G2	2264.84	2112.97	93.29	140.34	6.20	11.53	0.51
7 d	G2 E2	2537.79	2304.50	90.81	211.45	8.33	21.85	0.86
28 d	PC	2425.77	2269.00	93.54	126.41	5.21	41.83	1.72
28 d	E2	2336.80	2267.24	97.02	52.42	2.24	12.21	0.52
28 d	G2	2019.19	1953.99	96.77	58.83	2.91	6.37	0.32
28 d	G2 E2	1955.90	1900.81	97.18	7.33	2.42	7.76	0.40

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