氧化石墨烯对石膏基防火涂料力学性能及隔热性能的影响  

Effects of Graphene Oxide on the Mechanical Property and Insulating Property of Gypsum-Based Fire Resistance Coating for Steel Members

作　　者：何任飞[1] 陈素文[1,2] 程曦 陈宸 HE Renfei;CHEN Suwen;CHENG Xi;CHEN Chen(College of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《建筑钢结构进展》2021年第10期102-108,共7页Progress in Steel Building Structures

基　　金：“十三五”国家重点研发计划项目(2017YFC0703808)。

摘　　要：为了研究氧化石墨烯(GO)对石膏基防火涂料的改性作用,首先通过一系列力学性能试验,研究不同添加率的GO对石膏基防火涂料的抗压、抗拉、法向黏结和切向黏结强度的影响。结果表明:随着GO添加率的提高,石膏基防火涂料的抗压强度和抗拉强度增大,但其黏结强度与GO添加率无明显关系。然后通过扫描电镜对未添加和0.50%添加率GO改性的石膏基防火涂料的微观结构进行表征,发现GO可以改变水化晶体的形状和尺寸,使结构更加密实。进一步开展了未添加和0.50%添加率GO改性石膏基防火涂料的隔热性能试验,通过比对两者的等效热传导系数和受保护构件的升温曲线,发现GO可以一定程度地提高石膏基防火涂料的隔热性能。To investigate the modification of gypsum-based fire resistance coating by adding graphene oxide(GO),a series of mechanical property tests are firstly carried out to investigate the effects of GO with different additive amount on the mechanical properties of gypsum-based fire resistance coating for steel structures, including compressive strength, tensile strength, normal bond strength and shear bond strength.Test results show that with the increase of the additive amount of GO,the compressive and tensile strength of coating increase.However, there is no obvious correlation between the additive amount of GO and the bond strength of the coating.Scanning electron microscope is then employed to investigate the microstructure of the coating with 0.50% GO and without GO,which shows that the mixture of GO can change the size and shape of hydrous crystal and enhance the compactness of the structure.Furthermore, heat insulating tests are carried out on the coating with 0.50% and without GO,respectively.Comparisons of the equivalent thermal conductivity coefficients and the temperature curves of coated steel members show that the mixture of GO can improve the heat insulating property of the gypsum-based fire resistance coating.

关 键 词：氧化石墨烯 石膏基防火涂料 力学性能 隔热性能 扫描电镜分析 

分 类 号：TQ637.6[化学工程—精细化工]