How to seal between concrete???

[NETexas]

I am needing to increase the grade elevation around an iron fence post to improve drainage. I would like to add 2” or 3” of concert to the top of the existing concert holding up the post. Is there a special concert or sealer I can use to make a watertight seal between the two so the post doesn’t rust into a couple of years down the road?


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[tonyciambrone]

You could wrap the post in expansion joint foam. Tear away the top portion after the concrete cures and use a sealant/caulking designed for the purpose to fill the void left around it.

I think most people would just pour straight over it

 

[firebirdparts]

At work they grind away concrete all the time to get new to stick to old. You could slope the joint away from the metal also.

 

[Hank11]

Build a form around the post then wrap the post with a band of some type that forms a small gap at the top. Wraps of cord or string will work. Pour the form and trowel a little taper from the top all around. When it sets up a bit, pull the wrap off to expose the small gap that is left. Use something like Vulkem 116 to make a nice bead filling the gap between the concrete and post. Thats about the best you can do.

 

[NETexas]

Thanks for the replies. I was want to seal between the old and new concert, not so much at the top between the concrete and the steel. The joint between the old and new concrete will be below grade. Therefore water might be able to migrate to the steel post and rust or maybe not. Guess that is another question.


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[Renegade1LI]

Clean the surface & use an epoxy bonding agent, also add a couple of tapcon screws for the mechanical bond, than just slope the new concrete away from the post.

 

[ConCretin]

I wouldn't even bother with additional concrete. Such as small amount isn't going to be structurally sound much less protect the steel. I'd just coat or cover the steel and bury it. There are any number of products that could be used to accomplish that.

 

[Loose Nut Buster]

I agree w/LLWillie

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