摘要
由于石墨烯(G)在水泥浆体中易发生团聚,因此目前国内外有关石墨烯类材料掺配水泥基材料的研究主要集中在分散性能较好的氧化石墨烯(GO)上,对G与GO复掺的报道却较为罕见。为制备结构-功能一体化的水泥基复合材料,以G作为导电填料,借助GO对G的助分散作用,研究了不同G掺量下水泥砂浆的力学性能、导电性、电热性能和融雪化冰功能。28 d力学性能测试表明,当G达最佳掺量0.3%时,抗折抗压强度相比于空白试件提高了45%、35.7%,比单掺GO试件增长了31.8%、24.1%。微观结构测试表明G与GO能共同促进水泥水化进程,调控水泥水化产物形成花朵状晶体,密实水泥石结构。电学性能测试发现,石墨烯导电水泥基材料的渗滤阈值为0.5%,阈值下试件的力学及导电发热性能良好,外加60 V电压1 h温度可升高15.2℃,且在室内恒温下可显著加快融冰进程,25 min内即可将5 mm厚的冰层基本融化,具备不错的融雪化冰潜力。
Since graphene(G)is prone to agglomerate in cement paste,the current research on graphene-based materials blending cement-based materials mainly focuses on graphene oxide(GO)with better dispersion performance.Reports of G/GO co-blending are relatively rare.For the preparation of structure-function integrated cement-based composite materials,this paper uses G as a conductive filler,and with the aid of GO s dispersing effect on G,the mechanical properties,conductivity,electric heating performance and snow melting and ice melting functions of cement mortars with different G contents are studied.The 28 d mechanical performance test shows that when the dosage of G reaches the optimal content of 0.3%,the flexural compressive strength is increased by 45%and 35.7%compared to blank specimen,and 31.8%and 24.1%higher than that of single-doped GO specimen.Structural tests show that G and GO can jointly promote the process of cement hydration,regulate the formation of flower-like crystals from cement hydration products,and compact the structure of cement stone.Electrical performance tests have found that the percolation threshold of graphene conductive cement-based materials is 0.5%.What s more,good mechanical and conductive heating performance are shown under the threshold,the temperature of mortar specimen can be increased by 15.2℃for 1 h with 60 V voltage,and the ice melting process can be significantly accelerated at a constant indoor temperature.5 mm thick ice layer can be basically melted within 25 minutes,so it possesses good potential for deicing and snow-melting.
作者
袁小亚
张维福
曹潘磊
杨森
覃荫俊
YUAN Xiaoya;ZHANG Weifu;CAO Panlei;YANG Sen;Qin Yinjun(School of Material Science and Engineering,Chongqing Jiaotong University,Chongqing 40007,China;Guangxi Construction Engineering Group Holding Co.,Ltd.,Third Branch,Nanning 530003,China)
出处
《功能材料》
CAS
CSCD
北大核心
2021年第12期12100-12109,12115,共11页
Journal of Functional Materials
基金
国家自然科学基金项目(51402030)
重庆市基础科学与前沿技术研究专项资金项目(cstc2017jcyjBX0028)
重庆市大学生创新创业训练计划项目(S202110618004)。
关键词
石墨烯
氧化石墨烯
电学性能
融雪化冰
砂浆
力学性能
graphene
graphene oxide
electrical properties
melting snow and ice
mortar
mechanical properties
