Ken ETOH

Examination about Change of the Chloride Ion Concentration in the Desalination

Kyuichi MARUYAMA

The desalination technique is considered as a prospect repairing method of damaged concrete structures due to the salt attack.
In the actual application, the system of desalination is not always on because of the concerns of the excessive accumulation of hydrogen gas in steel reinforcement.
For an example, the system is usually controlled to be on for four and a half days and off for two and a half days per week. However, effectiveness of such control is not actually examined.
It is examined in this study how effective the desalination system is with respect to the on and off period of the system, the initial concentration of chloride ion and the current density in the system.
Test results show the followings.
(1) The effectiveness of desalination depends upon the off period.
(2) The desalination rate is low in the case of low initial concentration of chloride ion.
(3) The current density does not influence the desalination rate.