Abstract: This study explored the protection of steel from chloride-induced corrosion by cement slurry coatings with calcined Mg-Al layered double hydroxides. The calcined Mg-Al hydrotalcite material was added to the cement slurry to prepare a composite cement slurry coating on the steel bar surface. The corrosion inhibition performance of composite cement slurry coatings on chloride ion corrosion in concrete simulated pore solution was studied by the isothermal adsorption experiment, linear polarization test (LP) and electrochemical impedance spectroscopy (EIS). In addition, the phase change of the cement slurry before and after the adsorption experiment was observed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The results showed that the incorporation of LDO could significantly increase the saturated adsorption capacity of cement slurry, and with the increase of LDO content, the comprehensive effect of composite cement slurry coatings from chloride-induced was enhanced. LDO composite coatings controlled-release mechanism attributed to the recovery of lamellar mechanism could effectively adsorb chloride ions and release hydroxyl ions, which could effectively prevent the erosion of chloride ions.
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2018, Vol. 32 
