Old wives tale?

[carlyai]

I am building a large water tank. I have the slab poured and have not framed up the wall rebar to pour the walls.

I was not worried that the walls rebar is going rusty due to recent rain, but it seems the Thais are worried about the rust.

They want me to coat the tops of the vertical rebar with cement to stop the rust. I know cement on rebar stops the rust, but why paint the rebar tops with cement as the rest of the rebar is rusting already? Old wives tale?

 

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[BEVUP]

Rust is caused by oxidizing - goes to show they would not have a clue about concrete cancer ( which i already know ) 

NO NEED as once the concrete  encases the reo by a minimum of 1 inch (need to keep a close eye on that as i presume they want be doing the old render to cover all the sh*t ) it will be ok 

Notice how they cant pour a continous wall & slab together (as i had done with my pool here ) they had to wait a little while for the concrete to harden as it was just rising making the floor level higher due to the excessive water they put in the concrete which makes it weaker

[carlyai]

Thanks.
It was me who wanted the floor poured first. I could just see so much going wrong doing both together. Glad I did as the CPAC mob overbooked and my concrete trucks were always late. Just scrapped through on that one.

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[eyecatcher]

Can I say <deleted>? (horlicks)

If you start plastering cement around the rebar now then the main concrete wall pour will not be able to stick to it.

rebar has a ridged and profiled surface for a reason...to act as a key.

 

if you want to protect it which really you should, then red oxide it.

Its the oxydisation of metal that causes concrete to exfoliate as it rusts it expands.

 

makes you wonder where this book of Thai building technology is; I've not seen it has anyone else?

Edited April 3, 2017 by eyecatcher

[carlyai]

Can I say ? (horlicks)
If you start plastering cement around the rebar now then the main concrete wall pour will not be able to stick to it.
rebar has a ridged and profiled surface for a reason...to act as a key.
 
if you want to protect it which really you should, then red oxide it.
Its the oxydisation of metal that causes concrete to exfoliate as it rusts it expands.
 
makes you wonder where this book of Thai building technology is; I've not seen it has anyone else?

Thanks.
Does the red oxide work with rebar that has already oxidized? I thought you painted it on metal to stop the oxidation, ie before it rusted.
Stuff it...SWMBO et al have a bee in their bonnet about this one, will just mix up a cement slurry and brush over the rebar top only, for appearance sake. Keep everyone happy and show who the boss really is. ?

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[CGW]

4 hours ago, carlyai said:

Does the red oxide work with rebar that has already oxidized? I thought you painted it on metal to stop the oxidation, ie before it rusted.

No, forget red oxide, its a relic from the past, its a primer, a poor primer given the choices out there now!

[carlyai]

Was going to use it as changed my mind from the cement. So go back to a smear of cement? Gotta do something for appearance sake.

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[CGW]

27 minutes ago, carlyai said:

Was going to use it as changed my mind from the cement. So go back to a smear of cement? Gotta do something for appearance sake.

Use a decent primer, or a can of spray paint would be more effective than red lead.

[eyecatcher]

Or you can leave it alone and just cut it off and burn some new onto it at the appropriate time.

[carlyai]

Thanks for your replies.

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[carlyai]

Anyway, done it. Bringing happiness to all. [emoji38]

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