石墨烯
材料科学
热重分析
微观结构
氧化物
傅里叶变换红外光谱
水泥
复合材料
扫描电子显微镜
色散(光学)
抗压强度
抗弯强度
X射线光电子能谱
化学工程
纳米技术
冶金
光学
工程类
物理
作者
Guangqi Xiong,Yuanliang Ren,Chong Wang,Zhirui Zhang,Shuai Zhou,Chuan Kuang,Ying Zhao,Bumin Guo,Shuxian Hong
标识
DOI:10.1016/j.jobe.2023.106321
摘要
Dispersed graphene oxide incorporated into cement paste easily reaggregates in an alkaline environment, which is detrimental to the microstructure evolution and mechanical properties. In this study, a novel power ultrasound (PUS) assisted mixing technology was developed for optimizing the dispersion of graphene oxide in cement paste. X-ray computed tomography (X-CT) and Scanning electron microscopy-energy disperse spectroscopy (SEM-EDS) were used to characterize the distribution of graphene oxide. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and mercury intrusion porosimetry (MIP) were adopted to analyze the evolution of the hydration products. The results indicated that PUS-assisted mixing process improved the bonding ability between the Ca2+ and -COO- groups of graphene oxide. Moreover, applying PUS-assisted mixing decreased the average equivalent diameter of graphene oxide agglomerates by 9.9% at 1 day, alongside flexural and compressive strength increments of 26.6% and 3.2%, respectively at 1 day and 22.7% and 12.6%, respectively at 28 days compared with the reference group. The present research can provide a novel approach for the preparation of nanocarbon cement-based materials.
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