Title:
Condensation of Chloride Ion in Hardened Cement Matrix Materials and on Embedded Steel Bars
Author(s):
Shigeyoshi Nagataki, Nobuaki Otsuki, Tiong-Huan Wee, and Kenji Nakashita
Publication:
Materials Journal
Volume:
90
Issue:
4
Appears on pages(s):
323-332
Keywords:
chlorides; condensation; embedment; porosity; reinforcing steels; seawater; Materials Research
DOI:
10.14359/3885
Date:
7/1/1993
Abstract:
Paper shows that condensation of the water-soluble chloride ion in concrete and on embedded steel bars is surprisingly significant in concrete structures submerged in seawater. That is, the chloride ion concentration of the pore solution in the concrete structures can be considerably higher than the surrounding seawater. Also, the chloride ion concentrations of the solutions on steel bars can exhibit much higher, and these concentrations are closely related to the electrochemical property of steel bars. In addition, the formation of Friedel's salt is confirmed to be closely related to the binding of intruded Cl in materials with cement matrix. This research provides a better understanding of the intrusion mechanism of intruded Cl and the induced corrosion of steel in concrete.