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As part of ongoing research to validate the efficacy of a potentiodynamic polarization technique of determining the critical chloride threshold (C CRIT ) value of steel reinforcing bars exposed to chloride-contaminated concrete, the present work reports C CRIT  values of carbon steel exposed to NaCl, CaCl 2  and MgCl 2 . The increasing use of locally available multi-chloride anti-icing agents in Ontario during the winter season, which are brine solution with ~21% chloride as NaCl, CaCl 2  and MgCl 2 , resulted in a need to understand the impact of these salts on the threshold values. The potentiodynamic polarization method allowed the influence of these salts on C CRIT  values of carbon steel rebar to be determined in a significantly shorter period than existing standard methods. Cement pastes with varying admixed chloride as NaCl, CaCl 2  and MgCl 2  were cast with 0.5 w/cm ratio and their pore solution content was expressed after 28 days curing for cation and anion analyses. The resulting pore solution composition revealed increasing Ca, K and Na cations and increasing chloride and sulphate anions when the cement pastes were admixed with chloride as NaCl. However, sulphates decreased in the pore solution when the pastes were prepared with CaCl 2  and MgCl 2 . The consequence of the latter findings was that the threshold values by mass of pore solution of the carbon steel rebar exposed to these chloride compounds were significantly lower than bars exposed to pore solution with NaCl. Nevertheless, the conversion of these values to percentage by mass of cementitious materials gave surprisingly similar values for all three chlorides

Influence of chloride cations on pore solution chloride and critical chloride threshold of carbon steel rebar