Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications

Guangzhou, China

Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications

Guangzhou, China

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Fan Z.-H.,South China University of Technology | Fan Z.-H.,Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications | Li P.-P.,Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications | Su D.-G.,South China University of Technology | Wang S.-N.,Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2012

This paper deals with the influences of cementitious material composition on the durability of reinforced concrete with extravasated chloride via electrochemical impedance spectroscopy and MIP test. The results show that, with the increases of fly ash or slag content in the cementitious material, the durability, the resistivity and the charge transfer resistance of reinforced concrete all increase first and then decrease, while the corrosion rate of steel varies in an opposite trend; and that the chloride threshold concentration decreases with the increase of dissolved oxygen content and with the decrease of Ca(OH) 2 content around the steel. Moreover, it is found that, when cement is partially substituted with fly ash or slag, the density of the concrete increases, which results in the increase of charge transfer resistance, the improvement of stability of the passive film, the decrease of Ca(OH) 2 content, and, finally, the decrease of the chloride threshold concentration.


Li P.-P.,South China University of Technology | Su D.-G.,South China University of Technology | Wang S.-N.,Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications | Fan Z.-H.,South China University of Technology | Fan Z.-H.,Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2010

This paper deals with the influences of the S/Al molar ratio of cement and the sulfate in extravagation solution on the chloride threshold value via the linear polarization method, the mercury injection test and XRD. The results show that, with the increase of S/Al molar ratio, the chloride threshold value first increases and then decreases, while the chloride bounded in cement hydration products keeps reducing, that the S/Al molar ratio corresponding to the maximum chloride threshold value decreases with the increase of Al2O3 content of cement. More-over, it is also found that, when the specimens are immersed in the composite solution with the SO4 2- and Cl- concentrations similar to those of seawater, the chloride threshold value first increases and then decreases with the increase of S/Al molar ratio, but it is lower than that of the specimens immersed in NaCl solution, and that, with the penetration of SO4 2-, the mortar first becomes denser and then presents a volume expansion due to an excessive penetration, thus resulting in the decrease in chloride threshold value.

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