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The effect of calcium silicate hydrate (C-S-H) on chloride (Cl − ) binding and steel corrosion in simulated concrete pore solution (SCPS) was evaluated. The results showed that Cl −  absorbed by C-S-H conformed to Freundlich isotherm for 0.1–1.0 M of Cl − . When C-S-H reached equilibrium in saturated Ca(OH) 2  solution, its degree of polymerization increased. The high pH is unfavorable for the absorption of Cl −  by C-S-H, but favorable for the passivation of steel. The synthetic C-S-H powder contains NO 3− , which prolongs the passivation time of steel, but the presence of silicate is favorable for the formation of a passivation film with good corrosion resistance. The addition of C-S-H promoted the chloride threshold value of steel corrosion and delayed the corrosion development process.

Chloride absorption capacity of calcium silicate hydrate (C-S-H) and its effect on steel corrosion in simulated concrete pore solution