石墨烯水泥基复合材料早龄期电学及力学性能的研究

THE RESEARCH ON ELECTRICAL AND MECHANICAL PROPERTIES OF GRAPHENE CEMENT-BASED COMPOSITE UNDER EARLY AGE

本文采用改进的Hummer′s法制备了氧化石墨烯(GO),通过FTIR、XRD和SEM等微观表征技术对GO表面的官能团、结构进行了表征。研究了同一水灰比及早龄期的条件下,GO掺量的变化对水泥基复合材料的力学、电学性能的影响。研究结果表明:GO可以明显增强水泥基复合材料早期强度,当GO掺量为0.03wt%时,水泥基复合材料抗折、抗压强度达到最大值13.8、63.4MPa,比空白样品分别增加了近58%、47%。同时本研究利用四电极法测试了GO水泥基复合材料的电导率,发现GO水泥基复合材料的电导率随石墨烯掺量的变化符合渗流理论。当掺入GO的量约为0.03wt%时,水泥基复合材料的电阻率下降到了一个相对稳定的数值,并且具有良好的压敏效果。

In this paper, Graphite oxide （GO） was prepared by modified Hummer＇s method. Firstly, the functional groups and the structure were analyzed by FTIR, SEM and XRD. The influence of the change of GO content on the mechanical and electrical properties of cement based composites is studied under the same water cement ratio and early age. The results show that GO could significantly enhance the early strength of cement-based composites. When the GO content was 0.03wt.%, the flexural and compressive strength of cement-based composites reached the maximum value. 13.8MPa and 63.4M Pa increased by nearly 58% and 47% compared with blank samples, respectively. The results showed that GO could significantly enhance the early strength of cement-based composites. When the GO content was 0.03wt%, the flexural and compressive strength of cement-based compos- ites reached the maximum value. 13.8MPa and 63.4MPa increased by nearly 58% and 47% compared with blank samples, respectively. At the same time, the conductivity of GO cement-based composites was tested by four electrode method. It was found that the conductivity of GO cement-based compos- ites accorded with the seepage theory with the change of graphene content. When the amount of GO is about 0.03wt%, the resistivity of the cement-based composite decreases to a relatively stable value and has a good pressure sensitive effect.