环境因素对氧化石墨烯水泥基复合材料导电、压敏性能的影响  

Influence of Environmental Factors on Graphene Oxide/Cement Composites Conductive and Pressure Sensitivity Properties

作　　者：梁政显 夏海廷[4] 索玉霞 颜峰[1,2,3] 郭荣鑫 LIANG Zhengxian;XIA Haiting;SUO Yuxia;YAN Feng;GUO Rongxin(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,Kunming 650500,China;International Joint Laboratory for Green Construction and Intelligent Maintenance of Yunnan Province,Kunming 650500,China;Faculty of Civil Aviation and Aeronautics,Kunming University of Science and Technology,Kunming 650500,China;School of Civil Engineering and Transportation,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]云南省土木工程防灾重点实验室,昆明650500 [3]云南省绿色建造与智慧运维国际联合实验室,昆明650500 [4]昆明理工大学民航与航空学院,昆明650500 [5]华北水利水电大学土木与交通学院,郑州450045

出　　处：《材料导报》2024年第S01期52-63,共12页Materials Reports

基　　金：国家自然科学基金(11962009)。

摘　　要：制备水泥基传感器,实现水泥基体的自感应,是目前结构健康监测领域极具发展前景的研究方向之一。将氧化石墨烯(GO)掺入水泥,制备氧化石墨烯水泥基材料(GO/CCs),能改善水泥基体的力学性能及压敏性能。因此,GO/CCs受到了学者们的广泛关注。由于水泥基传感器会受环境因素影响,环境的变化会使水泥复合材料的温度及含水量发生变化,这将影响水泥基传感器的实际使用。目前,环境因素对GO/CCs性能的影响研究较少,尤其是环境因素对GO/CCs导电性能、压敏性能的影响。本工作通过超声波与聚羧酸减水剂结合的方法,制备了不同GO掺量的GO/CCs试件,研究了含水量和温度对GO/CCs导电性能的影响,测试了含水量对不同GO掺量试件压敏性能的影响。通过SEM及电化学阻抗谱(EIS)测试分析了GO/CCs的微观形貌及导电机理。结果表明,含水量及温度对GO/CCs的导电性能有较大影响,水分的提升使GO/CCs离子导电增强。温度敏感系数(TC)随GO掺量增加先增大后减小。不同含水量状态的GO/CCs提升其压敏性能的最佳掺量不同。0.1%掺量的GO能使水饱合状态的GO/CC试件内部的电接触更加稳定。本研究为进一步推进水泥基传感器在结构健康监测中的应用提供了指导。The preparation of cementitious sensors for self-sensing of cementitious matrix is one of the most promising research directions in the field of structural health detection.Graphene oxide(GO)was incorporated into cement to prepare graphene oxide/cement composites(GO/CCs),which can improve the mechanical and pressure-sensitive properties of the cement matrix.Therefore,GO/CCs have received extensive attention from scholars.As cementitious sensors are affected by environmental factors,environmental changes will change the temperature and water content of cement composites,which will affect the use of cementitious sensors.Currently,the effect of environmental factors on the performance of GO/CCs is not enough researched,especially the effect of environmental factors on the electrical conductivity and pressure-sensitive performance of GO/CCs.In this work,GO/CCs specimens with different GO doping were prepared by combining ultrasonic waves with polycarboxylic acid water reducing agents.The effects of water content and temperature on the electrical conductivity of GO/CCs were investigated.Tested the effect of water content on the pressure-sensitive properties of specimens with different GO dosage.The microscopic morphology and conductivity mechanism of GO/CCs were analyzed by SEM and electrochemical impedance spectroscopy(EIS).The results show that the moisture content and temperature have a large effect on the electrical conductivity of GO/CCs,the elevation of moisture enhances the ionic conductivity of GO/CCs.The temperature coefficient(TC)increases and then decreases with the increase of GO doping.The optimal dosing of GO/CCs to enhance their pressure-sensitive properties was different for different water content states.The 0.1%doping of GO improves the stability of the electrical contact inside the GO/CC specimen in the water-saturated state.This study provides guidance for further research on the application of cementitious sensors in structural health monitoring.

关 键 词：水泥复合材料 氧化石墨烯 导电性能 压敏性能 含水量 温度 

分 类 号：TU502[建筑科学—建筑技术科学]