纳米二氧化硅/氧化石墨烯复合物对普通硅酸盐水泥力学性能的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (10): 3352-3358.

纳米二氧化硅/氧化石墨烯复合物对普通硅酸盐水泥力学性能的影响

阴钰娇¹, 吴飞²

1.黄河交通学院交通工程学院,焦作 454950;
2.东南大学土木工程学院,南京 210096

收稿日期:2021-04-06 修回日期:2021-05-05 出版日期:2021-10-15 发布日期:2021-11-11
作者简介:阴钰娇(1988—),女,讲师。主要从事建筑与土木工程方面的研究。E-mail:cvc1511@163.com
基金资助:
国家自然科学基金(51908119)

Effects of Nano-Silica/Graphene Oxide Composite on Mechanical Properties of Ordinary Portland Cement

YIN Yujiao¹, WU Fei²

1. College of Traffic Engineering, Huanghe Jiaotong University, Jiaozuo 454950, China;
2. School of Civil Engineering, Southeast University, Nanjing 210096, China

Received:2021-04-06 Revised:2021-05-05 Online:2021-10-15 Published:2021-11-11

摘要/Abstract

摘要： 氧化石墨烯(GO)在水泥中的分散性较差,限制了其提高水泥基复合材料性能。采用溶胶-凝胶法制备了纳米二氧化硅/氧化石墨烯复合物(GOS),在模拟的水泥孔隙溶液中对比了GO和GOS的分散稳定性;同时,制备了添加纳米片的水泥浆体,研究了GO和GOS对其力学性能的影响。结果表明:GOS在水泥环境中的分散稳定性明显优于GO;与对照组相比,GO/水泥基复合材料的28 d抗折和抗压强度分别提高了20.48%和13.14%,而GOS/水泥基复合材料分别提高了35.42%和23.90%。微观分析表明,GO/水泥基复合材料内部形成花状水化晶体,GOS/水泥基复合材料内部的水化晶体彼此交联,结构致密,降低了水泥脆性,提高了韧性。

关键词: 氧化石墨烯, 纳米二氧化硅, 分散性, 水泥, 力学性能, 晶体结构

Abstract: The poor dispersion of graphene oxide (GO) in cement matrix hinders its effective improvement of performance of cement-based composites. SiO₂/GO (GOS) nanosheets were synthesized via a sol-gel process. The dispersion stability of GOS was compared to that of GO in a simulated cement pore solution. Then, cement pastes with the addition of nanosheets were produced and the effects of GO and GOS on its mechanical properties were investigated. The results show that GOS has significantly greater dispersion stability than GO. Compared with the control, the flexural and compressive strength of GO/cement-based composites at 28 d increase by 20.48% and 13.14%, while GOS/cement-based composites increase by 35.42% and 23.90%, respectively.Microscopic analysis shows that flower-like hydration crystals formed in GO/cement-based composites. The hydrated crystals inside GOS/cement-based composites were cross-linked with each other, and the structure was dense, which reduced the brittleness of the cement and improved the toughness.

Key words: graphene oxide, nano-silica, dispersion, cement, mechanical property, crystalline structure

中图分类号:

TQ172

阴钰娇, 吴飞. 纳米二氧化硅/氧化石墨烯复合物对普通硅酸盐水泥力学性能的影响[J]. 硅酸盐通报, 2021, 40(10): 3352-3358.

YIN Yujiao, WU Fei. Effects of Nano-Silica/Graphene Oxide Composite on Mechanical Properties of Ordinary Portland Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3352-3358.

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