摘要
氧化石墨烯(GO)已被证明可显著改善水泥复合材料的力学性能,而GO的分散性是影响复合材料性能增强的关键因素。以阿拉伯树胶(GA)为分散剂,采用光学显微镜、紫外分光光度计(UV-vis)和透射电镜(TEM)分析了GO在不同溶液中的分散稳定性,并制备了水泥复合材料。结果表明:高碱度和Ca2+是导致GO在水泥浆料中团聚的主要因素;添加阿拉伯树胶可确保GO在水泥模拟孔隙溶液中稳定分散;在阿拉伯树胶做分散剂的情况下,掺杂0.03%GO可使水泥复合材料的28 d抗折和抗压强度分别提高24.85%和42.11%;微观形貌显示阿拉伯树胶处理下的GO可促进水泥内部棒状晶体的形成,增强了结构密实性;以上均表明该分散方式可用于制备GO增强水泥复合材料。
Graphene oxide(GO)has been shown to significantly improve the mechanical properties of cement composites,and the dispersity of GO is a key factor affecting the performance enhancement of composites.In this paper,gum arabic(GA)was used as dispersant,the dispersion stability of GO in different solutions was analyzed by optical microscope,ultraviolet spectrophotometer(UV-vis)and transmission electron microscope(TEM),and cement composites were prepared.The results showed that high alkalinity and calcium ions were key factors inducing the agglomeration of GO in cement.The addition of GA could ensure the stable dispersion of GO in the cement simulated pore solution.The 28 d flexural and compressive strengths of 0.03%GO cement composites doped with GA increase by 24.85%and 42.11%,respectively.The morphological analysis showed that GO treated with GA promoted the formation of rod-like crystals inside the cement and enhanced the structural compactness.Therefore,indicating that this dispersion route could be successfully used for the preparation of GO reinforced cement composites.
作者
宋乔
吴磊
张宏江
SONG Qiao;WU Lei;ZHANG Hongjiang(Department of Civil Engineering,Henan Technical College of Construction,Zhengzhou 450064,China;CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430040,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)
出处
《工业建筑》
北大核心
2023年第5期174-178,共5页
Industrial Construction
基金
国家自然科学基金项目(52008321)。
