Effect of graphene quantum dots on fluidity, strength and salt corrosion resistance of cement mortar
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摘要: 采用吸光度试验和静置沉降试验考察了石墨烯量子点(GQDs)在模拟水泥水化孔隙液的饱和氢氧化钙溶液中分散性能及其对掺配砂浆工作性能、力学性能和耐久性的影响。吸光度测试和静置沉降试验表明GQDs在饱和氢氧化钙溶液中具有优异的分散稳定性，工作性能测试表明GQDs对水泥砂浆的流动度几乎无负面影响。力学性能测试表明GQDs最佳掺量为 0.04wt%时，28天抗折抗压强度比普通水泥砂浆分别提高了12.3%、12.5%，抗渗压力提升了 175%，120天抗压耐腐蚀系数提升了14.3%。微观结构测试表明 GQDs能改善孔径分布，填充纳米孔隙和提高水泥砂浆密实度。Abstract: The effect of dispersion of graphene quantum dots (GQDs) in saturated calcium hydroxide solution simulating cement hydration pore fluid was investigated by absorbance test and static settlement test, and the effect of workability, mechanical properties and durability of GQDs blended mortar was studied. The absorbance test and static settling test show that GQDs has excellent dispersion stability in saturated calcium hydroxide solution, and the workability test shows that GQDs has almost no negative effect on the flowability of cement mortar. Mechanical performance tests shows that the 28 days flexural and compressive strength of GQDs increase by 12.3% and 12.5%, compared with ordinary cement mortar at the optimum dose of 0.04wt%, the seepage pressure increases by 175%, and the 120 days compressive corrosion resistance coefficient increases by 14.3%. Microstructure tests show that GQDs could improve pore size distribution, fill nano-pores and improve the compactness of cement mortar.
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Key words:
- graphene /
- workability /
- mechanical properties /
- impermeability /
- microstructure
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图 7 GQDs、GO溶液的紫外可见吸收光谱
Figure 7. UV-visible absorption spectra of GQDs and GO solutions
图 8 GQDs、GO在饱和Ca(OH)2溶液的吸光度变化
Figure 8. Absorbance changes of GQDs and GO in saturated Ca(OH)2 solution
图 9 GQDs、GO在饱和Ca(OH)2溶液中静置情况
Figure 9. GQDs and GO were static in saturated Ca(OH)2 solution
图 10 不同GQDs掺量对砂浆流动度的影响
Figure 10. Effect of different GQDs contents on mortar fluidity
图 11 不同GQDs掺量对砂浆抗折强度的影响
Figure 11. Effect of different GQDs contents on flexural strength of mortar
图 12 不同GQDs掺量对砂浆抗压强度的影响
Figure 12. Effect of different GQDs contents on compressive strength of mortar
图 13 不同GQDs掺量对砂浆抗渗压力的影响
Figure 13. Influence of different GQDs contents on impermeability pressure of mortar
图 14 不同GQDs掺量对砂浆耐腐蚀系数的影响
Figure 14. Influence of different GQDs contents on corrosion resistance coefficient of mortar
图 15 不同GQDs掺量水泥砂浆孔径分布
Figure 15. Pore size distribution of cement mortar with different GQDs contents
图 16 不同GQDs掺量水泥砂浆SEM图像：((a), (b)) 普通水泥砂浆；((c), (d)) 0.04wt%GQDs/C
Figure 16. SEM images of mortars with different GQDs contents: ((a), (b)) Ordinary cement mortar; ((c), (d)) 0.04wt%GQDs/C
C-S-H—Hydrate calcium silicate; AFt—Ettringite
表 1 水泥物理性能
Table 1. Physical properties of the cement
Water requirement
of normal
consistency/%Specific surface
area/(m2·kg−1)Density/
(g·cm−3)Setting time/min Flexural strength/MPa Compression strength/MPa Initial Final 3 d 28 d 3 d 28 d 27.8 351 3.15 136 244 5.1 6.3 25.6 43.4 
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表 2 石墨烯量子点(GQDs)和氧化石墨烯(GO)的饱和Ca(OH)2溶液的配制
Table 2. Preparation of saturated Ca(OH)2 solution with graphene quantum dots (GQDs) and graphene oxide (GO)
Sample Water/mL Ca(OH)2/g GQDs/mL① GO/mL② X1 90 0.16 10 — X2 90 0.16 — 10 Notes: ①—GQDs solution concentration is 0.2 mg/mL; ②—GO solution concentration is 0.2 mg/mL.
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表 3 不同GQDs掺量的水泥砂浆配合比
Table 3. Mix ratios of cement mortars with different contents of GQDs
Sample S/g C/g PCE/g W/g Blank 1350 450 1.35 170 0.01wt%GQDs①/C 1350 450 1.35 170 0.02wt%GQDs①/C 1350 450 1.35 170 0.03wt%GQDs①/C 1350 450 1.35 170 0.04wt%GQDs①/C 1350 450 1.35 170 0.05wt%GQDs①/C 1350 450 1.35 170 0.01wt%GO②/C 1350 450 1.35 170 0.02wt%GO②/C 1350 450 1.35 170 0.03wt%GO②/C 1350 450 1.35 170 0.04wt%GO②/C 1350 450 1.35 170 0.05wt%GO②/C 1350 450 1.35 170 Notes: ①—Content of GQDs is its mass ratio to C; ②—Content of GO is its mass ratio to C; C—Cement; S—Sand; W—Water; PCE—Polycarboxylate.
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表 4 GQDs砂浆抗渗试件配合比
Table 4. Mix ratio of GQDs modified cement mortar for impermeability pressure test
Sample S/g C/g W/g Blank 1350 320 260 0.01wt%GQDs/C 1350 320 260 0.02wt%GQDs/C 1350 320 260 0.03wt%GQDs/C 1350 320 260 0.04wt%GQDs/C 1350 320 260 0.05wt%GQDs/C 1350 320 260
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