Repair of chloride attacked concrete

Question

Repair of chloride attacked concrete

hamza41 (Civil/Environmental)

(OP)

14 Jul 17 13:23

Hi,
Does anyone know a procedure that describes how to repair columns (60 cm of diameter) with high chloride content that caused rebar corrosion.
The chloride content is higher than the maximum allowed by the code up to more than 10 cm deep in the column.
Thank you.

dik (Structural) · Answer 1 · 2017-07-14 13:27:25

Once you have assessed the overall damage, it's a matter of cleaning the damaged concrete, protecting the reinforcing and patching. You have to be careful that the repair does not force the corrosion to the outside of the patch (corona effect).

Dik

jayrod12 (Structural) · Answer 2 · 2017-07-14 14:30:15

Is this the same project where we keep telling you to replace the columns?

JAE (Structural) · Answer 3 · 2017-07-14 15:10:55

Chloride extraction:
http://www.vector-corrosion.com/norcure-chloride-e...

http://www.vector-corrosion.com/uploads/content/40...

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dik (Structural) · Answer 4 · 2017-07-14 15:21:36

I've used Vector on many projects and they are pretty good.

Dik

hamza41 (Civil/Environmental) · Answer 5 · 2017-07-15 11:06:53

RE: Repair of chloride attacked concrete

hamza41 (Civil/Environmental)

(OP)

15 Jul 17 11:06

Thank you,

Yes Jayrod, it's the same.

hamza41 (Civil/Environmental) · Answer 6 · 2017-07-15 11:31:56

Is chloride extraction useful after the rebar corrosion has reached an advanced stage ?
Is it cheaper than reaplacing a column of 12 m high ?

hokie66 (Structural) · Answer 7 · 2017-07-15 11:38:17

RE: Repair of chloride attacked concrete

hokie66 (Structural) 15 Jul 17 11:38

No. And no.

dik (Structural) · Answer 8 · 2017-07-15 11:56:41

RE: Repair of chloride attacked concrete

dik (Structural) 15 Jul 17 11:56

concur

Dik

jayrod12 (Structural) · Answer 9 · 2017-07-16 17:53:40

I appreciate the fact that you are exploring all options for remediation. However the owner needs to realize that the cheapest and fastest way to repair the problem is to replace the columns.

dik (Structural) · Answer 10 · 2017-07-16 18:36:23

Jay... didn't realise it was an earlier posting.

Dik

jayrod12 (Structural) · Answer 11 · 2017-07-17 13:47:37

We've discussed this here

thread507-424485: Problem of cracks in RC columns

dik (Structural) · Answer 12 · 2017-07-17 14:01:02

RE: Repair of chloride attacked concrete

dik (Structural) 17 Jul 17 14:01

Thanks, Dik

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Repair of chloride attacked concrete