石墨烯-羧基化碳纳米管水泥基复合材料的高温力学性能研究  

Study on Mechanical Properties of Graphene-carboxylated Carbon Nanotube Cement-based Composites at High Temperature

作　　者：王小凡 朱华[1] 赵乙丁 鲍溢 WANG Xiao-fan;ZHU Hua;ZHAO Yi-Ding;BAO Yi(College of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051,China)

机构地区：[1]盐城工学院土木建筑工程学院,江苏盐城224051

出　　处：《混凝土与水泥制品》2023年第2期33-37,共5页China Concrete and Cement Products

基　　金：江苏省新型环保重点实验室开放基金资助项目(JBGS031);江苏省自然科学基金项目(BK20220694);盐城工学院校级科研项目(xjr2021009);中铁城建集团项目[CJ01-FJ-YCDLDCCF-2020-(ZYFB)00026]。

摘　　要：测试了不同质量比的石墨烯-羧基化碳纳米管(G-CNT)水泥基复合材料在25、200、400、600℃下的质量损失、抗压强度和抗折强度。结果表明:400℃以内,添加G-CNT复合材料后水泥基复合材料的残余力学性能显著提高,对质量损失的影响较小,水泥基复合材料的耐高温性能提高;400℃时,掺入0.10%CNT和0.05%G的水泥基复合材料的抗压强度仅下降了21.43%;400~600℃时,结合XRD和SEM结果可知,水泥基复合材料的微观结构严重破坏,力学性能显著下降;G5C10组为最佳配比,25~400℃时,在最佳配比下,G、CNT复掺后可以延缓或抑制因为高温爆裂引起的微孔隙和裂缝的扩散,形成致密化结构,进而提高水泥基复合材料的耐高温性能。The effects of different mass ratio of graphene-carboxylated carbon nanotubes(G-CNT)on the mass loss and mechanical properties of cement-based composites at 25,200,400 and 600℃were studied.The results show that within 400℃,the residual mechanical properties of cement-based composites are significantly improved after adding G-CNT composites,but the impact on mass loss is small,and the high temperature resistance of cement-based composites is improved.At 400℃,the compressive strength of cement-based composites with 0.10%CNT and 0.05%G decreases by only 21.43%.At 400~600℃,combined with XRD and SEM results,it can be seen that the microstructure of cement-based composites is seriously damaged and its mechanical properties are significantly reduced.G5C10 is the optimal ratio.At 25~400℃,under the optimal ratio,G-CNT can delay or inhibit the diffusion of micropores and cracks caused by high temperature explosion,and form a densified structure,thereby improving the high temperature resistance of cement-based composites.

关 键 词：石墨烯 羧基化碳纳米管 水泥基复合材料 抗压强度 抗折强度 耐高温性能 

分 类 号：TU528.07[建筑科学—建筑技术科学]