Abstract
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.
Highlights
The use of multi-walled carbon nanotubes (MWCNTs), as excellent mechanical and conductive fibers, for making self-sensing cementitious composites has attracted great interest
The results show that the addition of MWCNTs to the cement mortar accelerated the development of the steel corrosion under chloride environment
The results showed that the addition of MWCNTs increased the compressive strengths for mortars with w/c ratios of 0.4 and 0.5
Summary
Abstract: The use of multi-walled carbon nanotubes (MWCNTs), as excellent mechanical and conductive fibers, for making self-sensing cementitious composites has attracted great interest. Systematic study has not been found on the chloride-induced corrosion of embedded steel rebars in CNT-cement composites exposed to a chlorine salt environment. Previous studies have shown that the dispersion of fibers in reinforced cement-based material had an important effect on the levels of corrosion wherein corrosion rates were slightly higher due to a better conductivity of the composite with super conductive CNTs [13,14,15,16,17]. The purpose of this paper is to clarify the behavior of chloride migration and corrosion kinetics of reinforced cement mortar with different MWCNT contents under chloride environment. To this end, rapid chloride penetration tests were conducted to obtain chloride migration coefficients of the cement mortar. The conductivity of the mortar with MWCNTs, the corrosion potential, corrosion rate and electrochemical mass loss of steel rebar embedded in the mortar were tested
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