Like the rest of the
concrete groups, spray mixes concrete is
designed to be sprayed in one application to get that texture and knockdown
finish one does not get any other way. What makes it special is that it is a
special blend of high-strength cement, super fine aggregates, fibers, and
user-friendly polymers for spraying tight and close finishes.
It is packaged in 50-lb
bags with coverage of approximately 48 square feet at 1/8” thickness. The
application is used in spray applications to pool decks and vertical stucco
applications.
They are usually great for patios,
sidewalks, pool decks and driveways. They are great for knockdown finishes,
texturing retaining walls, basecoats for stenciling on concrete substrates, and
basecoats for tape down on concrete substrates.
Application
This concrete is conveyed through a
hose via a concrete pump and pneumatically projected at high velocity onto a
surface during construction. (The strength is from 25MPa to 50MPa with the
aggregate size of 6mm and 10mm options.
The spray mixes concrete undergoes placement and
compaction at the same time caused by the force used in project ting the
materials from the nozzle. On the surface, it can be formed into any shape of
surface including vertical and overhead.
Benefits
The advantages one gets are mostly in the application process. The
first is being able to have the placement from a concrete pump nozzle. As such,
it can be formed into any shape. Besides the conventional reinforcement steel, an
extra feature of adding fibers is additional options.
There is bank retention and underpinnings as well as using this as
a decorative rockwork. The other applications are on zoo enclosures and just as
many structural applications where access is an issue.
Sprayed concrete
Mixes concrete are part of the sprayed
concrete grouping in which the method of application is spraying the concrete
material rather than the more conventional pouring and placing into formwork.
(The common terms used are Gunite, Shot
concrete, and Shotcrete.)
There are several applications for
this method. Included are curved structures (including shell roofs and domes
and tunnel linings) and the pre-formed structure like swimming pools and
climbing walls.
Additionally, these would include
underground construction, retailing walls and piled wall facings. Sprayed concrete is also commonly utilized in
providing fire protection to steelwork and in strengthening as well as repair works
to present structures.
Application methods
There is the dry process
and the wet process procedures which are typically installed by different
specialist contractors. Both of these use high-velocity air to propel the
material.
The dry process has a
pre-determined dry mix of cement and aggregate. This is propelled through a
spraying nozzle where a finely atomized spray of water is added to the stream
of materials to hydrate the cement and becomes concrete.
The
wet process sprayed concrete uses batched wet concrete pumped through a hose or
pipe to a discharge nozzle where high pressure air propels the concrete into
position. The spray mixes concrete
is a wet process of the spray method of application of concrete and is a highly
specialized type concrete application.
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