269 / 2022-09-01 00:26:12

Assessment on Corrosion Risk of Embedded Steel Bars Limestone Calcined Clay Cement with Premixed Cl-

LC3; Cl- binding; Steel bar; Corrosion performance; Initial stage hydration

Limestone Calcined Clay Cement (LC3) presents brilliant Cl^- binding capacity so that the embedded steel bar is likely protected. However, corrosion performance of steel bars in LC3 concrete with premixed Cl^- still remain unclear, which is significant while evaluating the service life of a LC3 sea sand concrete structure. A series of experiments were carried out to evaluate the Cl^- binding capacity of the pastes and electrochemical behavior of the embedded steel bars. It is deduced from the results that premixed Cl^- lower than 0.54%wt is unlikely to initiate corrosion. Electrochemical and Cl^- binding results indicated that LC3 cement is more protective than PC in case of premixed Cl^-: a) LC3 cement demonstrates more superb Cl^- binding capacity than PC; b) Rebar in LC3 paste shows lower corrosion current density and more stable passivity; c) Less rust is produced on LC3 than on PC sample.