西安建筑科技大学学报(自然科学版)

为了研究氧化石墨烯对大体积粉煤灰(HVFA)混凝土表面耐磨性的影响,采用质量含量为0、0.01%、0.05%和0.1%的氧化石墨烯进行改性混凝土的研制,并以普通混凝土为参照组,测试了混凝土试件的抗压强度、显微硬度和磨损率,并对各指标的相关性进行了分析.试验结果表明:HVFA混凝土的表面耐磨性随氧化石墨烯含量呈增长趋势; 在HVFA混凝土中掺入氧化石墨烯后,在宏观上提高了试件的抗压强度,微观上增加了混凝土的显微硬度,二者均与试件的表面耐磨性有显著的相关性; 在0.05%的氧化石墨烯掺量下,改性混凝土的硬度随氧化石墨烯含量增加有明显提升; 当氧化石墨烯掺量大于0.05%时可能会发生结块效应,限制了显微硬度的提升.本研究结果可为氧化石墨烯混凝土的研制提供可靠的依据.

In order to study the modification effects of graphene oxide with quantity on the surface wear resistance of high-volume fly ash concrete, different contents of graphene oxide high-volume fly ash concrete samples are prepared, with the common concrete as the reference group. The compressive strength, microhardness and wear rate of modified mass fly ash concrete are measured. And correlation of strength, hardness and wear resistance are analyzed. Results show that the surface wear resistance of concrete increases with the content of graphene oxide. With the addition of graphene oxide to concrete, the compressive strength of the specimens is improved, and the microhardness of the concrete is also increased at the low level of graphene oxide contents. During the content increses from 0 to 0.05%, the hardness of the modified concrete increased significantly. Caking effect may occur when graphene oxide content is greater than 0.05%, limiting the improvement of microhardness and abrasive resistance. Results of the study can provide a reliable basis for the development of graphene oxide modified concrete.

引言
1 实验
2 实验结果
3 结论

表1 水泥和粉煤灰的化学成分<br/>Tab.1 Chemical components of cerment and flay ash

表1 水泥和粉煤灰的化学成分
Tab.1 Chemical components of cerment and flay ash

图1 水泥和粉煤灰的颗粒粒径分布<br/>Fig.1 Particle size distribution of cement and fly ash particles

图1 水泥和粉煤灰的颗粒粒径分布
Fig.1 Particle size distribution of cement and fly ash particles

图2 氧化石墨烯粉末照片<br/>Fig.2 Photo of graphene oxide powder

图2 氧化石墨烯粉末照片
Fig.2 Photo of graphene oxide powder

表2 混凝土试件的配合比<br/>Tab.2 Mix ratio of concrete specimens

表2 混凝土试件的配合比
Tab.2 Mix ratio of concrete specimens

图3 养护28 d后混凝土的抗压强度<br/>Fig.3 Compression strength of concrete after curing for 28 days

图3 养护28 d后混凝土的抗压强度
Fig.3 Compression strength of concrete after curing for 28 days

图4 混凝土试件耐磨性试验结果<br/>Fig.4 Abrasion resistance test results of concrete specimens

图4 混凝土试件耐磨性试验结果
Fig.4 Abrasion resistance test results of concrete specimens

图5 混凝土试件强度与耐磨性指标的关系<br/>Fig.5 Relationship between concrete specimen strength and wear resistance index

图5 混凝土试件强度与耐磨性指标的关系
Fig.5 Relationship between concrete specimen strength and wear resistance index

图6 混凝土试件显微硬度测试的结果<br/>Fig.6 Microhardness testing results of concrete specimens

图6 混凝土试件显微硬度测试的结果
Fig.6 Microhardness testing results of concrete specimens

图7 混凝土试件显微硬度与耐磨性指标的关系<br/>Fig.7 Relationship between themicrohardness and wear resistance index of concrete

图7 混凝土试件显微硬度与耐磨性指标的关系
Fig.7 Relationship between themicrohardness and wear resistance index of concrete

图8 混凝土试件SEM图像<br/>Fig.8 SEM image of concrete specimens

图8 混凝土试件SEM图像
Fig.8 SEM image of concrete specimens

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备注

引言

1 实验

2 实验结果

3 结论

期刊信息