Sprayed Concrete consists of a mixture
of Cement, Aggregate and Water (It may
also include fiber and / or admixtures),
conveyed through a hose and
pneumatically projected at high velocity
from a Nozzle to produce a dense,
homogenous mass.
The force of the impact of the surface
compacts material, which can support
itself without sagging even in wall and
overhead applications.
Properties: Sprayed concrete is an
extremely versatile material, requiring
a relatively limited amount of
construction plant.
However, it can be used effectively and
in suitable applications only with a
full appreciation of the similarities
to, and differences from, normally
placed concrete. Whereas the later needs
to be transported placed, compacted and
finished in four separate operations,
spraying enables the four stages to
proceed in a single operation
Wet Process: A mixture of Cement and
Aggregate (Weight Batched) mixed with
water in a mixer truck prior to being
conveyed through a pipeline to a nozzle
where air is injected and the mix,
projected without interruption into
place.
"Wet gun" means the wet (already mixed)
concrete is pumped to the nozzle. Air is
added at the nozzle to carry the
concrete mix to the target -- again
pneumatically applied. We call the
system "wet gunning." Here too operator
training is important, but not quite as
technical for wet gunners.
Dry Process: Gunite consists of fine
graded aggregate ideally containing not
over 6% moisture, mixed with cement in
specified ratio and projected
pneumatically by compressed air through
a fine rubber hose at high velocity,
attaining final hydration or wetting
just before being ejected from specially
designed nozzles.
The water / cement ratio for Gunite is
substantially less than the conventional
mixes, thus less shrinkage is
encountered. The coefficient of
expansion in Gunite is considered to be
about that of low carbon steel.
The force of the propelling compressed
air carrying the wet motor impacts the
material onto the surface being gunited,
resulting ill an extremely dense and
compact accumulation of zero concrete
Applications
Permanent Shoring for piles/Diaphragm
Walls
Concrete Rehabilitation
Soil Stabilization
Structural Fireproofing
Contact us for further details, we will
be pleased to answer your queries.
