氧化石墨烯/热还原氧化石墨烯改性砂浆的力学/电学性能研究  

Study on mechanical/electrical properties of cement mortar modified bygraphene oxide/thermal reduction graphene oxide

作　　者：曹蔚琦 魏致强 刘川 张琨念 袁小亚 CAO Weiqi;WEI Zhiqiang;LIU Chuan;ZHANG Kunnian;YUAN Xiaoya(Chongqing 2D Materials Research Institute,Chongqing 400714,China;Department of Optoelectronic Engineering,Chongqing University,Chongqing 400044,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Swansea University,Welsh SA28PP,UK)

机构地区：[1]重庆诺奖二维材料研究院,重庆400714 [2]重庆大学光电工程学院,重庆400044 [3]重庆交通大学材料科学与工程学院,重庆400074 [4]斯旺西大学,英国威尔士SA28PP

出　　处：《功能材料》2024年第1期1111-1116,共6页Journal of Functional Materials

基　　金：高端外国专家引进计划(G202235007L);重庆市自然科学基金面上项目(2022NSCQ-MSX1165)。

摘　　要：研究了热还原氧化石墨烯(TRGO)和氧化石墨烯(GO)在水泥砂浆环境下的分散机理,探索了这两种导电相的单掺和复掺对砂浆力学/电学性能的影响。研究表明GO对TRGO在富钙高碱环境下的分散有促进作用,且分散最佳质量比(%)为3∶10;与TRGO单掺相比,复掺GO能促进砂浆水化产物形成片状结构并互相交织,使得力学性能显著提升,当w(GO)∶w(TRGO)=0.3∶1.0时,28 d抗折强度和抗压强度与单掺TRGO相比提升了21.34%和34.52%,随着掺量增加力学性能反而下降;水泥砂浆的电导率随着GO与TRGO导电相的增加而增大,当w(GO)∶w(TRGO)=0.12∶0.4时,28 d龄期试件的电阻率呈现突变现象,表明该体系出现渗滤阈值;保持分散最佳比例下当TRGO大于0.7%(质量分数)之后,增加掺量对电阻率的影响趋于平缓且走低的趋势,表明TRGO掺量0.7%(质量分数)为试件电阻率的添加阈值。In this paper,the dispersion mechanism of thermal reduction graphene oxide(TRGO)and graphene oxide(GO)in cement mortar environment was studied,and the effect of single and multiple mixing of these two conductive phases on the mechanical/electrical properties of mortar was explored.The results show that GO can promote the dispersion of TRGO in calcium-rich and high-alkali environment,and the optimal dispersion mass ratio is 3∶10 wt%.Compared with TRGO mixed alone,the compound mixing of GO promotes the formation of sheet structure and interweaving of mortar hydration products,which significantly improves mechanical properties.When GO∶TRGO=0.3∶1.0 wt%,the flexural and compressive strength of 28 d cements increases by 21.34% and 34.52% compared with single mixed TRGO,but the mechanical properties decrease with the increase of mixing amount.The electrical conductivity of cement mortar increases with the increase of GO and TRGO conductive phases.When GO∶TRGO=0.12∶0.4 wt%,the resistivity of the 28-day age cement shows a sudden change,indicating that the system has a percolation threshold.Under the optimal dispersion ratio,when TRGO'amount exceeds 0.7 wt%,the increasing content on the resistivity tends to be flat and lower,implying that 0.7 wt%TRGO is the threshold of adding content to the resistivity.

关 键 词：氧化石墨烯 热还原氧化石墨烯 砂浆 力学性能 电学性能 

分 类 号：TU528[建筑科学—建筑技术科学]