Chen Zengshun, Xu Yemeng, Hua Jianmin, Wang Xu, Huang Lepeng, Zhou Xiao
School of Civil Engineering, Chongqing University, Chongqing 400033, China.
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
Materials (Basel). 2020 Jan 27;13(3):590. doi: 10.3390/ma13030590.
Graphene oxide (GO) has been widely used as an additive due to its numerous unique properties. In this study, the compressive strength, flexural strength and elasticity modulus of concrete containing 0.02 wt%, 0.05 wt % and 0.08 wt % GO, and its dry shrinkage performance have been experimentally investigated. After the sample preparation, apparatus for compression test and flexural test were used to test the relevant properties of concrete containing GO. The dial indicators were used to measure the shrinkage of samples. The results indicate that GO can considerably improve the compressive strength, flexural strength, and elasticity modulus of concrete at the concrete age of 28 days by 4.04-12.65%, 3.8-7.38%, and 3.92-10.97%, respectively, which are substantially smaller than the increment at the age of 3 d by 5.02-21.51%, 4.25-13.06%, and 6.07-27.45% under a water-cement ratio of 0.35. It was also found that GO can increase the shrinkage strain of concrete. For example, at the age of 60 days, 0.02 wt%, 0.05 wt% and 0.08 wt% GO can increase the shrinkage strain of ordinary concrete by 1.99%, 5.79% and 7.45% respectively under a water-cement ratio of 0.49. The study has advanced our understanding on mechanical and shrinkage behavior of concrete containing GO.
氧化石墨烯（GO）因其众多独特性能而被广泛用作添加剂。在本研究中，对含有0.02 wt%、0.05 wt%和0.08 wt% GO的混凝土的抗压强度、抗折强度和弹性模量及其干缩性能进行了试验研究。制备样品后，使用抗压试验和抗折试验设备来测试含GO混凝土的相关性能。使用百分表测量样品的收缩率。结果表明，GO能显著提高28天龄期混凝土的抗压强度、抗折强度和弹性模量，分别提高4.04 - 12.65%、3.8 - 7.38%和3.92 - 10.97%，这明显小于水灰比为0.35时3天龄期的增量，分别为5.02 - 21.51%、4.25 - 13.06%和6.07 - 27.45%。还发现GO会增加混凝土的收缩应变。例如，在60天龄期，水灰比为0.49时，0.02 wt%、0.05 wt%和0.08 wt%的GO分别可使普通混凝土的收缩应变增加1.99%、5.79%和7.45%。该研究增进了我们对含GO混凝土力学和收缩行为的理解。
