钢纤维和碳纳米管对超高性能混凝土抗氯离子渗透性能的影响  

Effect of steel fiber and carbon nanotube on resistance of ultra⁃high performance concrete to chloride ion penetration

作　　者：王涛 赵进阶[1] 杨勇新[1] WANG Tao;ZHAO Jinjie;YANG Yongxin(Central Research Institute of Building and Construction Co.,Ltd.MCC Group,Beijing 100088,China)

机构地区：[1]中冶建筑研究总院有限公司,北京100088

出　　处：《建筑结构》2024年第1期128-132,118,共6页Building Structure

基　　金：中冶建筑研究总院有限公司资助重大课题(YCK2017Ky01);国家重点研发计划(2016YFB0303200)。

摘　　要：碳纳米管的掺入对超高性能混凝土(UHPC)的抗氯离子渗透性能的影响尚不清晰,且很少有涉及加载对UHPC抗氯离子渗透性能影响的研究。因此,通过氯离子扩散系数测试法测定氯离子扩散系数,盐溶液浸泡下测定不同深度处氯离子浓度,观察微观结构等试验方法来探究碳纳米管和加载对UHPC抗氯离子渗透性能的影响。结果表明:加载造成的损伤会降低UHPC的抗氯离子渗透性能;在不同的加载程度下,不同浓度的碳纳米管对UHPC的抗氯离子渗透性能的影响是有区别的;碳纳米管既起到了填充孔隙的作用,又起到了促进钢纤维电化学腐蚀的作用。The effect of carbon nanotube incorporation on the chloride ion permeation resistance of ultra⁃high performance concrete(UHPC)is not clear,and there are few studies involving the effect of loading on the chloride ion permeation resistance of UHPC.Therefore,the effects of carbon nanotubes and loading on the chloride ion permeation resistance of UHPC was investigated by measuring the chloride ion diffusion coefficient by chloride ion diffusion coefficient method,determining the chloride ion concentration at different depths under salt solution immersion,and observing the microstructure and other experimental methods.The results show that the damage caused by loading will reduce the chloride ion permeation resistance of UHPC.Effect of different concentrations of carbon nanotubes on the chloride ion permeation resistance of UHPC under different loading levels is different.Carbon nanotubes play the role of both filling the pores and promoting the electrochemical corrosion of steel fibers.

关 键 词：超高性能混凝土 碳纳米管 钢纤维 氯离子扩散系数 氯离子浓度 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]