How To Build A Spray-In-Place Concrete Fence - Monolithic

This will vary from job to job and
must be adjusted. The water in the
aggregate will cause a difference in
the amount of water needed. Adjust to
a proper slump. 2” to 6” as needed.
Concrete Sand — 690 lbs. (Ten, 5
gallon buckets is a good approximate
measure).
Pea rock — 140 lbs. (Two, 5
gallon buckets.) The amount of pea
rock is adjusted per gradation of the
sand. If the sand is high in larger
aggregate the pea rock may be left out.
If it is low, then more may be needed.
This is a place to start for maximum
strength. The total of the sand and
pea rock should equal the 830 pounds
(twelve, 5 gallon buckets). Usually,
the pea rock is left out of the final
coats to provide a smoother finish.
Kel-Crete — use 2 oz. minimum
per batch. Try up to four ounces per
batch. Adjust between for the best
results. We normally use 2.5 ounces.
Add the Kel-Crete additive in with
the water for easier dispersion. If the
Kel-Crete is not added, another 1/3 of
a bag of cement should be added.
Nylon fibers — use 1/3 lb. Per
batch. These are the best fibers we
have found for what we are doing.
Total weight of this batch will be
about 1,100 pounds.
The nozzleman applies the second layer of
shotcrete. One can see that the rebar is
being buried with this second layer. The
fence is now approximately one and a half
inches thick. The rebar needs to be scraped
or ridges will be left. Do not apply all the
shotcrete at one time. Cover the fence then
go back and do it again. After a section
sets for even a short time it can often be
resprayed.
(Below) The nozzle should be held perpendicular
to the work or slightly pointed up as
shown on page 22. Never, never spray down
with only one exception — spraying the base
footing of the fence.
Spray the Shotcrete
The posts are obviously key to the
fence standing up. The size must be
large enough to restrain movement in
the soil. If the fence posts are in line
they must be larger than for the zigzag
fence.
The concrete of the upper part
of the post must rest securely on that
poured in the hole.
Blow and clean any material off
the top of the lower portion before
shotcreting the upper portion.
And be sure and spray onto the
top of the post immediately (first) to
prevent rebound or other materials
20