氧化石墨烯分散方式及其对水泥砂浆力学性能的影响  

Dispersion Method of Graphene Oxide and Its Effect on Mechanical Properties of Cement-based Materials

作　　者：袁小亚 高军 王远贵 魏致强 曾俊杰 郑旭煦 YUAN Xiao-ya;GAO Jun;WANG Yuan-gui;WEI Zhi-qiang;ZENG Jun-jie;ZHENG Xu-xu(School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学材料科学与工程学院,重庆400074 [2]重庆交通大学土木工程学院,重庆400074

出　　处：《混凝土与水泥制品》2020年第8期18-22,26,共6页China Concrete and Cement Products

基　　金：国家自然科学基金项目(51402030);重庆市基础科学与前沿技术研究专项基金项目(cstc2017jcyjBX0028);重庆市教育委员会科学技术研究项目(KJZD-K201800703)。

摘　　要：在饱和氢氧化钙水溶液中,采用木质素磺酸钙(木钙)作为助分散剂协同聚羧酸减水剂(PC)对氧化石墨烯(GO)进行分散,并通过吸光度、原子力显微镜、Zeta电位、SEM和XRD等研究了木钙对GO的分散效果及复掺对水泥砂浆力学性能的影响。结果表明:较PC单独分散GO,额外加入少量木钙能大幅度改善GO的稳定分散能力;当GO掺量为0.03%、木钙与GO的质量比为3∶1时,较于PC单独分散GO试件(即基准试件),助分散下GO掺配的水泥砂浆试件的3 d抗压强度、抗折强度分别提升了40.9%和22.5%,28 d抗压强度、抗折强度分别提升了22.1%和17.2%;相对于基准试件,木钙助分散下掺配GO的砂浆内部结构更密实;木钙与PC具有优异的协同分散GO的功效。In saturated calcium hydroxide aqueous solution,calcium lignosulfonate(CL)was used as a co-dispersant and polycarboxylic acid water reducer(PC)to disperse graphene oxide(GO),and through absorbance,atomic force microscopy,Zeta Potential,SEM and XRD were used to study the dispersing effect of wood calcium on GO and the effect of compounding on the mechanical properties of cement mortar.The results show that compared with PC dispersing GO alone,adding a small amount of wood calcium can greatly improve the stable dispersing ability of GO.When the GO content is 0.03%with 3∶1 mass ratio of CL to GO,the 3 d compressive and flexural strength of cement mortar specimens mixed with GO co-dispersed by PC and CL is increased by 40.9%and 22.5%,respectively,as comparison with those of only PC-dispersed GO specimens.28 d compressive and flexural strength of the cement mortar specimens is increased by 22.1%and 17.2%.The crystal growth of the hydration products of cement is more uniform and the overall internal structure is more compact at the case of the blending of GO co-dispersed by the addition of CL.CL and PC have an excellent synergy on the dispersion of GO.

关 键 词：氧化石墨烯 木质素磺酸钙 聚羧酸类减水剂 助分散 水泥砂浆 

分 类 号：TU528.572[建筑科学—建筑技术科学]