氧化石墨烯改性水泥砂浆抗氯离子渗透性能

摘要/Abstract

摘要： 采用快速电通量法及长期氯盐浸泡试验,研究了氧化石墨烯(GO)改性水泥砂浆的抗氯离子渗透性能,分析了电通量与表观氯离子扩散系数之间的关系,并通过扫描电镜(SEM)分析了其微观结构。结果表明:掺入适量的GO能够提升水泥砂浆的抗氯离子渗透性能,当掺量为0.06%(质量分数)时最显著,与无GO的对照组相比,水泥砂浆的电通量和氯离子侵蚀深度分别降低了34.5%和27.2%;长期氯盐浸泡60 d、120 d后,0~5 mm处的自由氯离子浓度最高分别降低了28.4%和15.3%;电通量与表观氯离子扩散系数之间存在良好的线性关系;GO有效调节了水化产物形状,减少了内部孔隙,使其微观结构更加密实,从而提升了水泥砂浆抗氯离子渗透性能。

关键词: 氧化石墨烯, 水泥砂浆, 氯离子渗透, 电通量, 表观氯离子扩散系数, 微观结构

Abstract: The chloride penetration resistance of cement mortar modified by graphene oxide (GO) was studied by rapid electric flux method and long-term chloride salt immersion test. The relationship between electric flux and apparent chloride diffusion coefficient was analyzed. The microstructure of the mortar was tested by scanning electron microscope (SEM). The results show that the incorporation of appropriate amount of GO improves the chloride penetration resistance of cement mortar. When the content is 0.06% (mass fraction), it is the most significant. Compared with the control group without GO, the electric flux and chloride erosion depth of cement mortar are reduced by 34.5% and 27.2%, respectively. After long-term chlorine salt immersion for 60 d and 120 d, the free chloride concentrations at 0~5 mm decrease by 28.4% and 15.3%, respectively. There is a good linear relationship between electric flux and apparent chloride diffusion coefficient. GO effectively regulates the shape of hydration products, reduces internal pores, and makes its microstructure more dense, thereby improving the chloride penetration resistance of cement mortar.

Key words: graphene oxide, cement mortar, chloride penetration, electric flux, apparent chloride diffusion coefficient, microstructure

中图分类号:

TU528

陈妤, 李创创, 李国浩, 董凯, 刘荣桂, 陆春华. 氧化石墨烯改性水泥砂浆抗氯离子渗透性能[J]. 硅酸盐通报, 2022, 41(5): 1539-1546.

CHEN Yu, LI Chuangchuang, LI Guohao, DONG Kai, LIU Ronggui, LU Chunhua. Chloride Penetration Resistance of Cement Mortar Modified by Graphene Oxide[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1539-1546.

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