POURING AND FINISHING AN EXPOSED AGGREGATE WALKWAY
edged and jointed, you are ready
to apply some releasing agent.
Commercial chemicals are avail-
able, but some old school guys
use a mix of molasses and
Removing stakes and form boards
is an important step in preparing
to expose the aggregate. Water
must run freely off the edges of
the walkway during washing.
Next, test for washing. My
friend Shawn Joslin pushes on
the surface with his finger tips. If
he doesn’t feel movement in the
gravel underneath, he knows it’s
ready. Villers teaches his guys
that it’s never too early to start
spraying, which is his way of say-
ing “don’t be late!”
There is such a thing as too
late when it comes to exposing
aggregate, and often the differ-
ence is how much you want to
work. Start it too late and you’ll
be bringing stiff-bristled brushes
If you’ve done much concrete finishing you’ve probably dealt with fixing a foot print, dropped tool mark or some
wayward dog prints before the concrete has set. Normally you just take some extra fines off of the tail of the trowel
or from the edges of a form board and fill in the depression—not a good idea for exposed aggregate. If your repair
material contains only fine sand and no larger aggregate, the depression will reappear during the washing process.
Any fill-ins or repairs must include rocks in order to blend in with the rest of the pour after the aggregate is exposed.
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