48-50 CONCRETE POOLS:SPN Master pages 11/3/09 23:10 Page 4
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delivery, weather glitches or change orders
– meaning clients change their minds
about something or decide to add on
something extra.
Spray-applied concrete has been in use
for almost a century, especially in
swimming pool construction.
Spray-applied concrete, “shotcrete” is
separated into either a wet process or a
dry process. For a dry-mix process, dry
cement and aggregate are driven through
an applicator hose, with water only added
at the nozzle. A wet-mix process is where
the concrete is pre-mixed before being
loaded into a hopper, from which it is
pumped through the delivery hose, and
spray-applied with compressed air added
at the nozzle via a separate hose.
Spray-applied concrete technology has
been in use for about 70 years, primarily in THIS & BELOW: Concrete pools in all their
civil engineering applications, such as
glory – spray applied concrete remains the
roads, roadway repairs and tunnels and in
most versatile technology able to cope with
all shapes, designs and ideas
commercial projects. The most common
residential uses are swimming pools and
foundation repair. More rarely, it is used for
basement foundations.
The finished strength of spray-applied
concrete averages 5,500psi. The resultant
concrete is different from conventional
cast-in-place concrete with regard to the
application surface, reinforcing, and of
course method of application. The wet
process is often the method of choice for
high-strength applications.
As with conventional poured concrete,
properties of spray-applied concrete can
be altered and enhanced through the
addition of additives or admixtures, such
as silica fume, air-entraining admixtures,
fibres and accelerators. Accelerators are
often incorporated at the plant so the
concrete sets quickly after application.
Spray-applied concrete is a versatile
technology. Besides walls and swimming
pools, it can be used to create floors, roofs,
and curved or other complex and variable
surfaces. Spray-applied concrete may be
applied to wood, steel, polystyrene or any
other surface to which it will adhere long
enough for the concrete to set.
Project complexity and scale also have a
tremendous effect on the timeline for
concrete pools. While a basic pool may
take only a few weeks, more intricate,
large-scale pools have been known to take
months and even years. Every stage,
beginning with excavation, will take longer
than with a small, basic pool. Also, some
materials require extra time: Surfacing a
complete pool with glass mosaic tile, for
instance, can take weeks on its own
because it is such meticulous work.
It’s possible to change the pool’s shape,
size and depth, or add whole new features.
These additions not only include basics such
as entry steps, benches and ledges, but also
more complicated water features. spn
SPRAYED CONCRETE SERVICES
telephonesolid 01704 533999
envelopeback
info@sprayed-concrete.co.uk
pc
www.sprayed-concrete.co.uk
50 swimming pool news APRIL 09
➤➤➤
Digital edition available at
www.swimmingpoolnews.co.uk
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