Degradation of concrete with addition of mineral admixture due to free chloride ion penetration under the effect of carbonation. (1st July 2018)

• Record Type: Journal Article
• Authors: Jin, Ming; Gao, Song; Jiang, Linhua; Chu, Hongqiang; Lu, Mengting; Zhi, Fang Fang
• Is Part Of: Corrosion science. Volume 138(2018)
• Page Start: 42
• Page End: 53
• Publication Date: 2018-07-01
• Subjects: Steel reinforced concrete -- Reinforcement corrosion -- Mineral admixtures -- Chlorides -- Carbonation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.04.004
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Free Cl − content in concrete was determined by embedded Cl − selective electrodes. Penetration of free Cl − in carbonated or uncarbonated concrete follows Fick's second law. The ability of carbonation to resist penetration of Cl − is stronger than that to promote Cl − . Concrete after carbonation has a higher risk of inducing steel corrosion. Abstract: The free Cl − diffusion law, binding Cl − capacity and long-term reliability of electrodes in concrete were investigated under the effects of carbonation. Results reveal that the diffusion of free Cl- in concrete with and without carbonation adheres to Fick's second law. Reducing ratio of water to binder and adding mineral admixture can decrease the free Cl- diffusion coefficient. Although the ability of carbonation to resist the penetration of Cl- is stronger than that to promote Cl- erosion, concrete after carbonation has a higher risk of initiating steel corrosion. Improving the reliability and decreasing the cost of electrodes requires more research.