Up until this year the city repaired sidewalks that had been pushed up
by tree roots by breaking up sections and pouring new cement. This
year they started patching them up by laying down asphalt, and then
pouring what looks like cement on top while it's still hot, smoothing it
out and then sweeping off the excess. It blends in fine and seems to be
OK, but I'm wondering how long the cement overlayer will last.
It's been a good 3 weeks now, and new cement dust still comes up each
time I sweep. I have hesitated hosing it off thinking I may end up with
Does this sound like normal or did the city not do it right?
I don't know what the coating is but I'm guess it's not cement.
As the tree roots expand, the asphalt should expand with it and possibly
allow the sidewalk to remain smooth rather than crack. It will bulge of
course but from a safety standpoint at least leave no edges to trip over.
Did they do it right?
You will find out over then next few years.
If there is new concrete dust every time you sweep, then that concrete
hasn't cured properly. By now it should be hard as a rock.
Maybe take a sponge and bucket of water and clean that concrete with a
wet sponge. See if any of the concrete transfers to the sponge and the
water in the pail gets clowdy. If so, then it's not cured, and won't if
it hasn't by now. Maybe contact your city's Works & Operations
Department if you find that the concrete hasn't cured properly.
By now the loose power is gone and there's enough concrete covering the
asphalt so that it blends in close enough with the original sidewalk.
Looks fine now, but from seeing old patches around here, I expect the
thin concrete layer to wear off and leave an asphalt surface. Better
than broken sidewalks, but I don't see why they could not have used all
concrete in the first place.
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