石墨质改性混凝土高温性能的研究

摘要/Abstract

摘要： 通过热处理后混凝土力学性能及微观结构的变化,研究了石墨、氧化石墨烯复合玄武岩纤维对混凝土高温性能的影响。结果表明:石墨的添加会引起混凝土力学稳定性的降低,而氧化石墨烯则可以大幅度提升混凝土的高温力学稳定性,有效降低了热处理所带来的劣化影响;玄武岩纤维与石墨、氧化石墨烯的复合使用均未形成协同作用效果,反而降低了试样的力学性能。微观分析显示石墨分散在材料体系之中形成了界面缺陷,而氧化石墨烯可以在材料系统中形成紧密连续的交联结构,有效提高了混凝土的高温力学性能。

关键词: 石墨, 氧化石墨烯, 混凝土, 微观结构

Abstract: The influence of graphite and graphene oxide combined with basalt fiber on the high temperature performance of concrete was studied by mechanical properties and microstructure of concrete after heat treatment. The results show that the addition of graphite reduces the mechanical stability of concrete, while graphene oxide greatly improves the mechanical stability of concrete and effectively reduces the deterioration effect of heat treatment. The combination of basalt fiber with graphite and graphene oxide not only fails to form a synergistic effect, but also reduces the mechanical properties of the specimens. The micro-analysis show that graphite disperses in the material system formed interface transition zone defects, but graphene oxide forms a close and continuous cross-linking structure in the material system, which effectively improves the high temperature mechanical properties of concrete.

Key words: graphite, graphene oxide, concrete, microstructure

中图分类号:

TQ178

郑慧君. 石墨质改性混凝土高温性能的研究[J]. 硅酸盐通报, 2020, 39(12): 3851-3857.

ZHENG Huijun. High Temperature Performance of Graphite Modified Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3851-3857.

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