镀镍碳纤维改性混凝土的力学性能及改性机理研究  

Study on mechanical properties and modification mechanism of nickel-plated carbon fiber modified concrete

作　　者：李宗方 张涪民 陈亮[2] LI Zongfang;ZHANG Fulin;CHEN Liang(China Nuclear Power Engineering Corporation,Beijing 100840,China;School of Civil Engineering and Architecture,Chongqing University of Posts and Telecommunications,Chongqing 400074,China)

机构地区：[1]中国核电工程有限公司,北京100840 [2]重庆邮电大学土木建筑学院,重庆400074

出　　处：《功能材料》2025年第3期3143-3149,共7页Journal of Functional Materials

摘　　要：与碳纤维(CF)相比,镀镍碳纤维(Ni-CF)具有更好的亲水性、导电性、电磁损耗能力,其在混凝土中具有更为广阔的应用前景。对比分析了CF与Ni-CF的力学性能和分散性,并将Ni-CF引入混凝土中制备了镀镍碳纤维改性混凝土(Ni-CFMC)。测试了Ni-CFMC的强度和韧性,研究了Ni-CF对混凝土力学性能的影响,并与CF进行了比较。结合SEM试验,对Ni-CF的改性机理进行了研究。结果表明:Ni-CF的力学性能较CF更加优异,CF表面光滑,而Ni-CF表面粗糙,Ni-CF的分散性较CF更强。Ni-CF可以提高混凝土的强度和韧性,且对混凝土力学性能的提高效果优于CF。随着Ni-CF掺量的增大,Ni-CFMC的抗压、抗折和劈裂拉伸强度及折压比均先增大后减小。Ni-CF和CF的最佳掺量分别为0.4%、0.3%。CF/混凝土基体界面存在孔隙,而Ni-CF与混凝土基体结合相对较好。Ni-CF表面的镍镀层可以提高其与混凝土基体的机械咬合力。Compared with carbon fiber(CF),nickel-plated carbon fiber(Ni-CF)has better hydrophilicity,electrical conductivity and electromagnetic loss ability,which has a broader application prospect in concrete.The mechanical properties and dispersion of CF and Ni-CF are compared and analyzed,and Ni-CF is introduced into concrete to prepare nickel-plated carbon fiber modified concrete(Ni-CFMC).The strength and toughness of Ni-CFMC are tested,and the effect of Ni-CF on the mechanical properties of concrete is studied and compared with CF.The modification mechanism of Ni-CF is studied by SEM test.The results show that the mechanical properties of Ni-CF are better than that of CF.The surface of CF is smooth,while the surface of Ni-CF is rough,and the dispersion of Ni-CF is better than that of CF.Ni-CF can improve the strength and toughness of concrete,and the improvement effect of Ni-CF on the mechanical properties of concrete is better than CF.With the increase of Ni-CF content,the compressive strength,flexural strength,splitting tensile strength and flexural-compressive strength ratio of Ni-CFMC first increase and then decrease.The optimal content of Ni-CF and CF is 0.4%and 0.3%,respectively.There are pores at the CF/concrete matrix interface,while Ni-CF is well combined with concrete matrix.The Ni coating on the surface of Ni-CF can improve the mechanical biting force between Ni-CF and concrete matrix.

关 键 词：混凝土 镀镍碳纤维 力学性能 界面 强度 

分 类 号：TU528[建筑科学—建筑技术科学]