Product Information
Polyroad Stabilisation
 The
design of Polyroad stabilised pavements is to preserve the existing dry
strength pavement properties and resist the ingress of water which is the
major cause of pavement failure. Polyroad binders were first incorporated
into pavements in Australia in 1988 and have since been extensively used
in National and State
Highways in Australia and parts of Asia.
Polyroad consists of an insoluble
polymer thermally bound to an 'inert fine carrier', typically flyash. The
polymer encapsulates the flyash rendering the flyash inert and does not
react chemically in the stabilisation process. Hydrated lime is added to
the polymer-coated carrier but is not coated with the polymer. The lime's
function is to flocculate and prepare clay particles for adhesion to the
polymer rather than generate pozzolanic cementitous bonds.
 Polyroad binder types
are dependent upon the plasticity index (PI) of the parent material to be
stabilised as follows:
- Polyroad PR100 is 100% polymer-coated fine inert carrier, spread at
a rate of 1%, and is used with materials that are non-plastic.
- Polyroad PR21L is spread at a rate of 1.5%, containing 67% polymer
and 33% hydrated lime, and is for materials with a PI of 12% or less.
The 33% of lime in the blend is only to open up clay plates to then be
coated with the polymer - not to perform pozzolanic reactions as
typically associated with lime stabilisation.
- Polyroad PR11L is spread at a rate of 2%, containing 50% polymer and
50% hydrated lime, and is for materials with a PI of 12% to 20%. Again
the lime is only required to break open the clay plates for polymer
attachment.
 Polyroad's ability to perform without pavement
misshape or maintenance repair to date, is predominantly a result of no
plastic deformation occurring within the pavement because of the
'internal'
waterproofing of fine grained particles that Polyroad provides.
Polyroad stabilisation has been
used by New South Wales, Victorian, Queensland and Tasmanian State Road
Authorities and numerous Local Government Authorities in New South Wales
and Victoria.
Related pages and documents:
Polyroad Technical Overview
For more information Contact Us
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