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Associate

Join Date: Jan 2014
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Electrochemical Repair Question

04/19/2014 4:27 AM

Dear all:

Thank you inadvance for your input.

Can electrochemical repair last indefinitely or up to 120 years only even if regular electrical input.

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#1

Concrete Conundrum

04/19/2014 5:51 AM

That's a hard question. I'll let you know in another 96 years.

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#2
In reply to #1

Re: Concrete Conundrum

04/19/2014 6:50 AM
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#3

Re: Electrochemical Repair Question

04/19/2014 10:50 PM

Yes...let me know if I'm wrong.

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#4

Re: Electrochemical Repair Question

04/19/2014 10:59 PM
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#5

Re: Electrochemical Repair Question

04/21/2014 3:31 PM

What's the application exactly? "Indefinitely or up to 120 years" is a long time after all.

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#6

Re: Electrochemical Repair Question

04/28/2014 11:14 AM

There are several issues involved: (1) you may reduce future corrosion by forced migration of chloride ion out of the concrete near the re-bar. (2) hydrogen is being produced at the re-bar, since this is cathode of the cell, and this could lead to hydrogen embrittlement of the steel if this does not rapidly abate to the environment. (3) I don't think there is any actual reversal of the existing oxides (that are the cause of internal pressure of the concrete that leads to cracking from within. Besides these considerations, there are other undiscussed considerations, such as quake stresses, load fluctation stress, etc. How well is the whole reinforcment grid connected to the cell?

Answer: this will not reverse existing damage to the structure, but does tend to serve as a palliative in extending the life of the structure a little further. I would not translate "indefinite" as anything like 120 years. If protection was applied when the structure was built, then something maybe could be said for an increased life expectancy, as long as the hydrogen issue is covered, assessed, and monitored.

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