Degradation of concrete with addition of mineral admixture due to free chloride ion penetration under the effect of carbonation

Ming Jin, Song Gao, Linhua Jiang, Hongqiang Chu, Mengting Lu, FangFang Zhi

Index: 10.1016/j.corsci.2018.04.004

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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.