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Joint free slabs:
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Joint free slabs is a patented
system for slab on grade pavements constructed using
our innovative method of catering for concrete shrinkage.
In traditional slabs on grade control joints are installed
for this purpose. Joint Free Slabs
Pty Ltd has developed a crack inducer grid that eliminates
the need for all control joints.
The joint free slabs crack
inducer grid consists of plastic tubes and four way
junctions that are assembled on site and installed on
the ground, their primary purpose being to induce a
closely spaced network of fine cracks throughout the
entire length and breadth of the slab. With this system
vast areas of slab on grade can be constructed much
faster than is possible using traditional details, and
there is the potential for sizeable direct savings in
both the construction cost and the construction time.
Added to this, the aesthetics of the finished floor
are superior and the cost of ongoing maintenance is
significantly reduced. All in all, joint free slabs
can be summed up in three words: better, quicker, cheaper.
Assembly and installation of the crack inducer grid
is very simple and requires no special skill. Extruded
plastic crack inducer tubes are supplied to each project
cut to length, and these push snugly onto the moulded
plastic junctions which double as bar chairs for support
of the reinforcement mesh. The only on-site cutting
required for the crack inducers is at penetrations and
possibly some sections of the perimeter. The set-out
of the grid on each project is sufficiently flexible
to generally avoid the need for on-site cutting of the
grid elements around the perimeter.
The joint free slab method
of detailing and placing concrete pavements is patented
in Australia (Patent No New Zealand Patent 523811), and patents have been
applied for in many countries around the world.
Joint free slabs received
industry recognition when just twelve months after the
system was launched Building Innovations received an
Award for Excellence from the Concrete Institute of
Australia at its biennial conference in 2001. The Award
was presented in the Concrete Technology category, recognising
"construction techniques and innovation that contribute
to the understanding and use of concrete."
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