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Posted by Colbyt on November 11, 2006, 5:14 pm
>
> Buck Turgidson wrote:
>> I have a step to a door where a chunk chipped off the end. If I built a
>> wood form and filled it in with concrete or straight portland cement,
>> would
>> it bond to the existing concrete?
>
> Cement repairs bond fairly well, but you need to choose your material
> carefully. First, old chipped concrete is inherently dirty. Start your
> repair by chipping down to fresh unexposed concrete. Chisel a few
> grooves if you can to key the repair in place. Build a form. You should
> have a HIGH STRENGTH concrete patch or mortar mix on hand, which you
> bought at Menards, Home Depot or wherever. Mix what you need and follow
> directions on the bag precisely, not too dry, nor too wet. Dampen the
> chiseled area and pat it dry or use a bit of compressed air if you
> have it available. Trowel on your mortar and smooth off and work out
> the bubbles. Let it alone for a couple of days and take off the forms.
> A little work with a mason's mortar stone will smoooth off the little
> imperfections and you're good to go. HTH
>
> Joe
>
Adding to the advice above I would install two or more anchor pins to help
reinforce the patch. Depending on the size of the patch these pins would
vary in size from large tapcon screws to 3/8" rebar.
No matter what you do it is not going to last forever.
Colbyt
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