I just fixed a broken corner on my concrete steps with (2) of the small
Quickrete containers. It is quick setting material, and the temperature is
60 degrees and dry. I shaped a beautiful corner and it formed nicely.
Then...about two hours later I noticed vertical and horizontal cracks in the
patch. One railing leg goes into the patch, but no one went near the
railing. How could it crack that soon? It was even still the dark gray color
for the most part.
I'm so disappointed about this. I thought I did very well, but now I don't
know what to do. Does anyone know how/why this happened??
Dave in Minneapolis
It sounds like shrinkage cracking.
You need to have lots of water in the original concrete or it will
suck the moisture out of your patch. Once formed and finished,
keep it wet. This could be done by keeping a wet towel on the
patch for the first 3 days. Keep adding water to keep it wet.
I assume you used something that had bonding agent in it. The
fact that there is a railing leg in the patch sounds like you
won't win in the long term unless you brace, relocate, or
otherwise take the pressure away from the area. You're hoping to
get a patch to stick, it will never support the rail.
Keep the whole world singing. . . .
The product was never designed to do what your trying to do.
Try looking for a Elmer's glue looking product for concrete. It will bond
the new to the old maybe better. Try again when it is warmer. Frame under
the patch and around the patch. Cover with a wet cloth for at least 24
Lastly barricade the porch, top and bottom. Any vibration when setting will
cause problems. Remove the railing from the concrete until it is set. It has
a different temp coefficient than the concrete.
Just suggestions. Me thinks your not going to get it patched.
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