有机染料辅助分散氧化石墨烯及其对水泥砂浆强度和耐久性的影响

盛况; 杨森; 毕俊峰; 袁小亚

doi:10.13801/j.cnki.fhclxb.20220113.001

有机染料辅助分散氧化石墨烯及其对水泥砂浆强度和耐久性的影响

doi: 10.13801/j.cnki.fhclxb.20220113.001

重庆交通大学　材料科学与工程学院，重庆 400074

基金项目: 国家自然科学基金(51402030)；重庆市基础科学与前沿技术研究专项基金(cstc2017jcyjBX0028)；重庆市教育委员会科学技术研究项目(KJZD-K201800703)

详细信息

通讯作者:
袁小亚，博士，教授，硕士生导师，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:yuanxy@cqjtu.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: 2021-11-17
- 修回日期: 2022-01-04
- 录用日期: 2022-01-05
- 网络出版日期: 2022-01-14
- 刊出日期: 2022-11-01

Effect of organic dye assisted dispersion of graphene oxide on mechanical properties and durability of cement mortar

College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China

摘要

摘要: 研究了采用有机染料罗丹明B (RhB)辅助聚羧酸减水剂(PCE)分散氧化石墨烯(GO)及其对水泥砂浆强度和耐久性的影响。通过吸光度试验、Zeta电位及AFM表征研究了RhB对GO在饱和氢氧化钙(CH)溶液中的分散性能，结果表明在掺入少量RhB情况下可以大幅度提升GO在CH溶液中的分散性，且当GO与RhB质量比为1∶2时，GO的分散效果最佳。力学强度测试表明，在RhB的辅助分散下，当GO掺量为水泥质量的0.03wt%时，28天抗折、抗压强度相较于不掺入RhB的GO砂浆试件提升最大分别为14.78%、33.29%。耐久性试验表明RhB能促进GO在水泥水化产物的模板作用，使结构更为致密，减少受冻融与硫酸盐的侵蚀，耐久性能显著提高。微观测试表明RhB的加入可以促进GO调控水化产物生长的作用，明显减少内部结构孔洞、裂缝等缺陷。本文提供了一种引入低成本的有机染料来提升GO在水泥孔隙液中的分散性能，具有许多潜在的应用价值。
- 氧化石墨烯 /
- 罗丹明B /
- 水泥基复合材料 /
- 力学性能 /
- 耐久性
Abstract: The dispersion of graphene oxide (GO) with organic dye rhodamine B (RhB) assisted polycarboxylic acid water reducer (PCE) and its effect on the strength and durability of cement mortar were studied. The dispersion of GO in saturated calcium hydroxide (CH) solution by RhB was studied by absorbance test, Zeta potential, and AFM characterization. The results show that the dispersion of GO in CH solution could be greatly improved when a small amount of RhB was added, and the dispersion effect of GO is the best when the mass ratio of GO to RhB is 1∶2. The mechanical strength test shows that the maximum increase of 28 days flexural and compressive strength are 14.78% and 33.29% respectively under the auxiliary dispersion of RhB compared with the GO mortar specimens without RhB, when the content of GO is 0.03wt% of the mass of cement. The durability test shows that RhB could promote the template effect of GO on cement hydration products, make the structure more compact, reduce the corrosion by freeze-thaw and sulfate, and significantly improve the durability. The microscopic test shows that the addition of RhB could promote the role of GO in more regulating the growth of hydration products, and the defects such as internal structure holes and cracks are significantly reduced. This work provides a method to introduce low-cost organic dyes to improve the dispersion performance of GO in cement pore solution, which has many potential applications.
- graphene oxide /
- rhodamine B /
- cement-based composites /
- mechanical properties /
- durability

HTML全文

图 1 GO和RhB溶液 (a) 及RhB水溶液和RhB在Ca²⁺溶液中的200~800 nm的紫外可见光图谱 (b)

Figure 1. UV-Vis spectra of GO and RhB solutions (a) and RhB aqueous solution and RhB in Ca²⁺ solution at 200-800 nm (b)

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图 2 RhB对GO在饱和CH溶液中吸光度的影响

Figure 2. Effect of RhB on absorbance of GO in saturated CH solution

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图 3 RhB对GO在饱和CH溶液中表面电位的影响

Figure 3. Effect of RhB on the Zeta potential of GO in saturated CH solution

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图 4 RhB与GO质量比为2∶1的饱和CH溶液中GO分散的AFM图像

Figure 4. AFM image of GO dispersion in saturated CH solution using the 2∶1 mass ratio of RhB to GO

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图 5 RhB对不同掺量GO掺配水泥砂浆3天和28天抗压强度和抗折强度的影响

Figure 5. Effect of RhB on 3 days and 28 days compressive strength and flexural strength of mixed cement mortar with different dosages of GO

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图 6 GO与RhB质量比恒定为1∶2时不同掺量GO掺配水泥砂浆XRD图谱

AFm—C₃A·CaSO₄·12H₂O; AFt—C₃A·3CaSO₄·32H₂O

Figure 6. XRD patterns of cement mortar mixed with different amount of GO when the mass ratio of GO to RhB is constant 1∶2

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图 7 不同掺量RhB和GO掺配水泥砂浆SEM图像：(a) Control CM；(b)0.06%RhB/CM；(c) 0.03%GO/CM；(d) 0.03%GO-0.06%RhB/CM

C-S-H—Gel of calcium silicate hydrated

Figure 7. SEM images of cement mortars mixed with different dosages of RhB and GO: (a) Control CM; (b) 0.06%RhB/CM; (c) 0.03%GO/CM; (d) 0.03%GO-0.06%RhB/CM

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图 8 RhB对GO掺配水泥净浆不同龄期的化学结合水含量的影响

Figure 8. Effect of RhB on chemical bound water content of GO blended cement paste at different ages

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图 9 RhB对GO不同掺量掺配水泥砂浆冻融循环后质量损失率与力学强度损失率的影响

Figure 9. Effect of RhB on mass loss rate and compressive strength loss rate of cement mortar mixed with different GO contents after freeze-thaw cycles

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图 10 不同掺量GO掺配水泥砂浆冻融循环150次前后的SEM图像：((a), (b)) Control CM；((c), (d)) 0.03%GO/CM；((e), (f)) 0.03%GO-0.06%RhB/CM

Figure 10. SEM images of different cement mortars with different GO contents before and after 150 freeze-thaw cycles: ((a), (b)) Control CM; ((c), (d)) 0.03%GO/CM; ((e), (f)) 0.03%GO-0.06%RhB/CM

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图 11 RhB对GO不同掺量掺配水泥砂浆抗硫酸盐干湿循环后质量损失率与耐腐蚀系数的影响

Figure 11. Effect of RhB on mass loss rate and corrosion resistance coefficient of cement mortars mixed with different amount of GO after sulfate dry wet cycles

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图 12 不同掺量GO掺配水泥砂浆抗硫酸盐150次干湿循环后的SEM图像：(a) Control CM；(b) 0.03%GO/CM；(c) 0.03%GO-0.06%RhB/CM

Figure 12. SEM images of cement mortars mixed with different amount of GO after 150 dry-wet cycles: (a) Control CM; (b) 0.03%GO/CM; (c) 0.03%GO-0.06%RhB/CM

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表 1 水泥化学成分

Table 1. Chemical components 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

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表 2 水泥砂浆和净浆试件配合比

Table 2. Mixture ratio of cement mortar and cement paste

Sample	Cement/g	Water/mL	Sand/g	GO/wt%	RhB/wt%	PCE/wt%
Control CM	450	166	1350	0.00	0.00	0.3
0.06%RhB/CM	450	166	1350	0.00	0.06	0.3
0.03%GO/CM	450	166	1350	0.03	0.00	0.3
0.01%GO-0.02%RhB/CM	450	166	1350	0.01	0.02	0.3
0.03%GO-0.06%RhB/CM	450	166	1350	0.03	0.06	0.3
0.05%GO-0.1%RhB/CM	450	166	1350	0.05	0.10	0.3
Control CP	300	87	0	0.00	0.00	0.3
0.06%RhB/CP	300	87	0	0.00	0.06	0.3
0.03%GO/CP	300	87	0	0.03	0.00	0.3
0.01%GO-0.02%RhB/CP	300	87	0	0.01	0.02	0.3
0.03%GO-0.06%RhB/CP	300	87	0	0.03	0.06	0.3
0.05%GO-0.1%RhB/CP	300	87	0	0.05	0.10	0.3
Notes: Content of GO, RhB and PCE is mass ratio to cement; GO—Graphene oxide; RhB—Rhodamine B; PCE—Polycarboxylic acid water reducer; CM—Cement mortar; CP—Cement paste.

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表 3 GO和RhB混合溶液配比

Table 3. Mix solution ratio of GO and RhB

Sample	Water/g	PCE/mL	GO/mg	RhB/mg	CH/g
2.5GO-0RhB	123.74	0.1	2.5	0.00	0.2
2.5GO-1.25RhB	123.74	0.1	2.5	1.25	0.2
2.5GO-2.5RhB	123.74	0.1	2.5	2.50	0.2
2.5GO-3.75RhB	123.74	0.1	2.5	3.75	0.2
2.5GO-5RhB	123.74	0.1	2.5	5.00	0.2
2.5GO-6.25RhB	123.74	0.1	2.5	6.25	0.2
Note: CH—Calcium hydroxide.

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