阿拉伯树胶处理下氧化石墨烯在水泥复合材料中的分散性研究  

Investigation on Dispersion of Graphene Oxide in Cement Composite using Gum Arabic

作　　者：宋乔[1] 吴磊 张宏江 SONG Qiao;WU Lei;ZHANG Hong-jiang(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)

机构地区：[1]河南建筑职业技术学院土木工程系,郑州市450064 [2]中交第二航务工程局有限公司,武汉市430040 [3]武汉理工大学,硅酸盐建筑材料国家重点实验室,武汉市430070

出　　处：《公路》2023年第8期302-307,共6页Highway

基　　金：国家自然科学基金项目,项目编号52008321。

摘　　要：氧化石墨烯(GO)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Ca^(2+)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可促进水泥内部形成棒状晶体,增强了结构密实性。研究结果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 proved to significantly improve the mechanical properties of cement composites,and the dispersion of GO is a key factor that affects the performance enhancement of composites.In this paper,gum arabic(GA) is used as dispersant,the dispersion stability of GO in different solutions is analyzed by optical microscope,ultraviolet spectrophotometer(UV-vis) and transmission electron microscope(TEM),and cement compound materials are prepared.The results show that high alkalinity and calcium ions are key factors inducing the agglomeration of GO in cement.The addition of GA can ensure the stable dispersion of GO in the cement simulated pore solution.Adding 0.03%GO can increase the 28 d flexural and compressive strength of cement composites by 24.85% and 42.11%,respectively.The morphological analysis shows that GO treated with GA promotes the formation of rod-like crystals inside the cement and enhances the structural compactness.All above indicates that this dispersion means can be successfully used for the preparation of GO reinforced cement composites.

关 键 词：水泥 氧化石墨烯 阿拉伯树胶 分散性 模拟孔隙溶液 

分 类 号：U414.01[交通运输工程—道路与铁道工程] TU525[建筑科学—建筑技术科学]