The applications I've seen all fail after a short time, as the cracks keep
developing, affecting the stone overlay. Properly laying epoxied stone
pebbles takes considerable skill and pre-cleaning, and few contractors know
how to do it, from what I have seen.
You probably can't. You could TRY just cutting out the section
that's cracked, and pouring a new segment in with expansion
joints at each side. You'll still have "cracks", but it will
look like you did it on purpose, and if the subsurface prep
isn't right, which is usually what causes these problems in
the first place, then your three slabs will eventually heave
out of alignment and you'll have bumps.
About the best medium term solution is a flexible calk that can move
with the changes in temperature etc. You can buy some concrete color (sort
of) at the DIY store in the area where they sell the concrete products.
Epoxy coatings are not a repair at all. It is simply an alternate texture to
concrete, so it is cosmetic only. Short of using concrete crack filler that
comes in a caulking tube, there is nothing you can do short of replacing the
concrete, as you have frost heave, expansive soils, or improper underlay
aggregate/gravel.. BTW crack fillers tend not to match after awhile, and
look even worse than the original cracks they were intended to hide.
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