CONDENSATION OF CHLORIDE-ION IN HARDENED CEMENT MATRIX MATERIALS AND ON EMBEDDED STEEL BARS

Paper shows that condensation of the water-soluble chloride ion in con crete and on embedded steel bars is surprisingly significant in concre te structures submerged in seawater. That is, the chloride ion concent ration of the pore solution in these concrete structures can be a grea t deal higher than the surrounding seawater. Also, the chloride ion co ncentrations of the solution on steel bars can exhibit much higher, an d these concentrations are closely related to the electrochemical prop erty of steel bars. In addition, the formation of Friedel's salt is co nfirmed to be closely related to the binding of intruded Cl- in materi als with cement matrix. Therefore, this research provides a better und erstanding of the intrusion mechanism of intruded Cl- and the induced corrosion of steel in concrete.