Effect of graphene quantum dots on mechanical properties and microstructure of serpentine concrete
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摘要: 为了考察石墨烯量子点(GQDs)作为外掺料改善蛇纹石混凝土性能的可行性，研究了25、150、300、450和600℃时GQDs掺量对蛇纹石混凝土强度、结晶水损失率和微结构的影响。结果表明：室温(25℃)下，蛇纹石混凝土强度随GQDs掺量的增加而提升，当掺量为0.12wt%时，改善效果最佳，其7天、28天抗压强度和28天劈裂抗拉强度分别较基准组提高了26.4%、20.9%和27.7%；加热期间，与未掺GQDs的蛇纹石混凝土相比，掺入0.12wt%的GQDs使蛇纹石混凝土结晶水损失率降低了1.8%~20.0%，抗压强度和劈裂抗拉强度分别增加了18.0%~34.0%和29.4%~39.8%；微观试验表明高温环境促使蛇纹石混凝土水化，而GQDs拥有较好的导热性和纳米填充性，在二者共同作用下显著提高了蛇纹石混凝土的微观致密度，且300℃时致密度最高。Abstract: In order to explore the feasibility of using graphene quantum dots (GQDs) as admixtures to improve the properties of serpentine concrete, effects of GQDs dosage on strength, crystal water loss rate, and microstructure of serpentine concrete were investigated at 25, 150, 300, 450, and 600℃. The results show that strength of serpentine concrete at room temperature (25℃) is enhanced with the increase in the dosage of GQDs, and the best enhancement is achieved when the dosage is 0.12wt%, and its 7 days and 28 days compressive strength and 28 days splitting tensile strength are increased by 26.4%, 20.9%, and 27.7%, respectively, compared with the baseline group. The addition of 0.12wt% GQDs reduces the crystal water loss rate of serpentine concrete by 1.8%~20.0%, and increases the compressive strength and splitting tensile strength by 18.0%~34.0% and 29.4%~39.8%, respectively, as compared to serpentine concrete without GQDs during the entire heating period. Microscopic tests show that high temperature environment promotes the hydration of serpentine concrete, as well as GQDs possess better thermal conductivity and nano-filling properties, which together significantly improve the micro-density of serpentine concrete, and the micro-density is highest at 300℃.
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Key words:
- serpentine concrete /
- GQDs /
- crystal water /
- mechanical properties /
- high temperature stability /
- microstructure
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图 1 石墨烯量子点(GQDs)的微观表征结果
Figure 1. Results of graphene quantum dots (GQDs) microscopic characterization
图 2 不同GQDs掺量对蛇纹石混凝土抗压强度的影响：(a)抗压强度值；(b)抗压强度增长率
Figure 2. Compressive strength of serpentine concrete with different dosages of GQDs: (a) Compressive strength value; (b) Compressive strength growth rate
图 3 不同GQDs掺量对蛇纹石混凝土劈裂抗拉强度的影响
Figure 3. Splitting tensile strength of serpentine concrete with different dosages of GQDs
图 5 高温后蛇纹石混凝土的抗压强度
Figure 5. Compressive strength of serpentine concrete exposed to high temperatures
图 6 高温后蛇纹石混凝土的劈裂抗拉强度
Figure 6. Splitting tensile strength of serpentine concrete exposed to high temperatures
图 7 高温后SG-12的XRD图谱
Figure 7. XRD patterns of SG-12 at elevated temperatures
CH—Ca(OH)2; AFt—Ettringite; C3S—3CaO·SiO2
表 1 水泥和蛇纹石的化学成分
Table 1. Chemical compositions of cement and serpentine
Material type Mass fraction/wt% MgO SiO2 Fe2O3 Al2O3 CaO Na2O SO3 Other LOI Cement 2.16 21.45 4.37 5.07 60.65 0.58 2.33 1.25 2.14 Serpentine 42.43 37.56 4.22 0.56 0.32 0.17 0.11 0.79 13.84 Note: LOI—Loss on ignition. 
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表 2 蛇纹石的物理性质
Table 2. Physical properties of serpentine
Aggregate type Apparent density/
(kg·m−3)Bulk density/
(kg·m−3)Voidage/wt% Water
absorption/wt%Moisture
content/wt%Crush
index/wt%Fineness
modulusFine serpentine 2 320 1 330 43 9.6 5.0 28.0 2.7 Coarse serpentine 2 600 1 490 43 2.8 1.3 11.7 —
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表 3 蛇纹石混凝土配合比/(kg·m−3)
Table 3. Mix proportion of serpentine concrete/(kg·m−3)
Concrete type Cement Coarse serpentine Fine serpentine Water GQDs SG-0 375 1 039 637 195 0 SG-03 375 1 039 637 195 0.1125 SG-06 375 1 039 637 195 0.2250 SG-09 375 1 039 637 195 0.3375 SG-12 375 1 039 637 195 0.4500
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