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concrete over concrete?

Posted by robinasq (My Page) on
Tue, Jul 30, 13 at 14:50

I have filled the space under my front door threshold with concrete. Now I want to extend the lip about 1-2" .
Can I pour new concrete over the old?
Is it too large to use concrete patch?
Do I need adhesive?
Should I mix extra cement to strengthen it?
Thanks for any guidance.

Follow-Up Postings:

RE: concrete over concrete?

You have two choices, Remove the over-pour, correctly form to the desired dimensions, install a support for the overhang portion.
Install a support for the proposed over-hang.

Adding cement to some mysterious cement product will cause it to become brittle.

RE: concrete over concrete?

That is so small amount of concrete,proper cureing is very problematic. Then you have to deal with adhearing old to new. Extra portland added to sack mix helps cure and priming old surface with portland and water slurry will handle adhesion. There are some floor underlayment products that would work but unfortanly,there are more that don't even make good underlayment. If you want to try,get a source from a floor machanic. I guess if you fail,you can always bust the old and new out as easy as the old now.

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