Abstract The use of multi-walled carbon nanotubes (MWC-NTs), as excellent mechanical and conductive fibers, for making self-sensing cementitious composites has attracted great interest. However, few researches have focused on the durability of mortar with MWCNTs. This paper attempts to explore the corrosion of embedded steel rebar in cement mortar with different contents of MWC-NTs. Tests for compressive strength, chloride migration coefficient, conductivity, and corrosion behaviors of MWCNT-cement mortar were carried out. The results show that the addition of MWCNTs to the cement mortar accelerated the development of the steel corrosion under chloride environment. The migration behavior of chlorine ions and steel corrosion rate were related to the carbon nanotube content. The increase in carbon nanotube content resulted in higher steel corrosion intensities. Moreover, the rates of chloride transport into the mortar increased with the nanotube content under both accelerated and natural chloride conditions.

中文翻译：

---

多壁碳纳米管增强水泥砂浆的氯化物腐蚀行为

摘要 多壁碳纳米管（MWC-NTs）作为优良的机械和导电纤维，用于制造自感应水泥基复合材料引起了人们极大的兴趣。然而，很少有研究关注具有 MWCNTs 的砂浆的耐久性。本文试图探讨不同MWC-NTs含量的水泥砂浆中埋入钢筋的腐蚀情况。对多壁碳纳米管水泥砂浆的抗压强度、氯化物迁移系数、电导率和腐蚀行为进行了测试。结果表明，在水泥砂浆中加入多壁碳纳米管加速了氯化物环境下钢腐蚀的发展。氯离子迁移行为和钢腐蚀速率与碳纳米管含量有关。碳纳米管含量的增加导致更高的钢腐蚀强度。此外，在加速氯化物和自然氯化物条件下，氯化物传输到砂浆中的速率随着纳米管含量的增加而增加。