GO增强掺钼尾矿免烧砖的微结构和力学性能  

Microstructure and Mechanical Properties of GO Reinforced Molybdenum Tailings Non-Fired Bricks

作　　者：李春 周文博[1,3] 王豪 李琴琴 何红霖 王之宇 南宁 Li Chun;Zhou Wenbo;Wang Hao;Li Qinqin;He Honglin;Wang Zhiyu;Nan Ning(College of Chemical Engineering and Modern Materials,Shangluo University,Shangluo,Shaanxi 726000;Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo,Shaanxi 726000;Research Centre of Graphene Technology and Application,Shangluo University,Shangluo,Shaanxi 726000)

机构地区：[1]商洛学院化学工程与现代材料学院,陕西商洛726000 [2]商洛学院陕西省尾矿综合利用重点实验室,陕西商洛726000 [3]商洛学院商洛市石墨烯技术与应用研究中心,陕西商洛726000

出　　处：《非金属矿》2022年第4期45-48,共4页Non-Metallic Mines

基　　金：国家级大学生创新创业训练计划项目(202111396002);陕西省教育厅重点科学研究计划(20JS041);陕西省尾矿资源综合利用重点实验室开放基金资助项目(2017SKY-WK011)。

摘　　要：为解决免烧砖因微裂纹导致力学性能较低的问题,本试验采用改进的Hummers法制备氧化石墨烯(GO),探究了GO添加量对免烧砖力学性能和微观结构的影响。结果表明,添加GO可增加水化反应的活性位点,促进硅酸二钙和硅酸三钙参与水化反应进程,加速氢氧化钙和水化硅酸钙晶体生成,使得水泥基体形成大规模形状规整的微观结构。当GO添加量为0.05%时,免烧砖抗折和抗压强度较未改性免烧砖分别提高43.31%和59.35%。In order to solve low mechanical properties caused by microcracks in the non-fired bricks,graphene oxide(GO)was prepared by the modified Hummers method,and the effects of GO addition on the mechanical properties and microstructure of non-fired bricks were investigated.The results show that the active sites of hydration reaction could be increased by GO.The process of dicalcium silicate and tricalcium silicate participating in hydration reaction was promoted.The formation of calcium hydroxide and hydrated calcium silicate crystals were accelerated.They lead to form a large-scale and regular microstructure in the cement matrix.When the addition of GO is 0.05%,the flexural and compressive strength are increased by 43.31%and 59.35%respectively compared with unmodified unburned brick.

关 键 词：氧化石墨烯 钼尾矿 免烧砖 力学性能 水化反应 

分 类 号：TU528[建筑科学—建筑技术科学] X75[环境科学与工程—环境工程]