氧化石墨烯对混凝土复合材料的增韧效果研究  

Research on the toughening effect of graphene oxide on concrete composites

作　　者：刘文娟 辜琳然 熊欢 吴汉美 LIU Wenjuan;GU Linran;XIONG Huan;WU Hanmei(School of Building Management, Chongqing Metropolitan College of Science and Technology,Chongqing 402167, China)

机构地区：[1]重庆城市科技学院建筑管理学院,重庆402167

出　　处：《功能材料》2021年第12期12216-12220,共5页Journal of Functional Materials

基　　金：重庆市教委科学技术研究计划项目(KJQN202102502,KJQN201902505)。

摘　　要：在普通硅酸盐水泥P.O 42.5的基础上,选择聚羧酸减水剂和粗骨料,并以氧化石墨烯作为增强体,制备出了不同氧化石墨烯掺量(0.00,0.05%,0.10%和0.15%(质量分数))的混凝土复合材料,研究了不同氧化石墨烯掺量下混凝土复合材料的性能差异。结果表明,随着氧化石墨烯的掺杂,混凝土的水化难度降低,水化反应速率增加,混凝土复合材料相互之间的颗粒接触更加紧密,且氧化石墨烯的掺杂并未产生新的水化产物;当氧化石墨烯的含量为0.10%(质量分数)时,复合材料的流动度最大为256 mm,坍落度和孔隙率达到了最低值,分别为27 mm和26.3%,抗压强度和抗折强度达到了最大值,分别为44.70和7.68 MPa,相比未掺杂氧化石墨烯的混凝土,抗压强度和抗折强度分别提高了6.18%和6.52%。综合分析可知,氧化石墨烯的掺杂含量为0.1%时各项性能最佳。On the basis of ordinary Portland cement P.O 42.5,polycarboxylic acid water reducer and coarse aggregate are selected,and graphene oxide is used as reinforcement to prepare concrete composites with different content of graphene oxide(0.00,0.05 wt%,0.10 wt%and 0.15 wt%).The performance differences of concrete composites with different content of graphene oxide are studied.The results show that with the doping of graphene oxide,the hydration difficulty of concrete decreases,the hydration reaction rate increases,the particles of concrete composites contact more closely,and the doping of graphene oxide does not produce new hydration products.When the content of graphene oxide is 0.10 wt%,the maximum fluidity of the composite is 256 mm,the slump and porosity reach the lowest values,27 mm and 26.3%,respectively,and the compressive strength and flexural strength reach the maximum values,44.70 and 7.68 MPa,respectively.Compared with the concrete without graphene oxide,the compressive strength and flexural strength are increased by 6.18%and 6.52%,respectively.The comprehensive analysis shows that the performance is the best when the doping content of graphene oxide is 0.1wt%.

关 键 词：氧化石墨烯 混凝土 水化产物 流动度 力学性能 

分 类 号：TU528.59[建筑科学—建筑技术科学]