Technical Information
Polyroad Stabilising
Technical Notes - Overview
| Introduction |
Construction Procedure |
Testing for Suitability |
| Design Considerations |
Polyroad is a dry powdered polymer (DPP) used as a stabilising binder
for rehabilitation of granular pavements or new pavement construction.
Polyroad effectively waterproofs granular materials that would otherwise
lose significant strength during moisture ingress.
The stabilising powder within Polyroad consists of a polymer thermally
bound to an "inert fine carrier", which is then mixed with hydrated lime.
The lime is not coated with polymer. The function of the lime is to
flocculate and prepare clay particles for adhesion to the polymer. The
carrier, which is encapsulated by the polymer, is effectively inert and
does not react chemically in the stabilisation process. The function
of the carrier is to facilitate uniform distribution of the polymer
throughout the granular material.
Back to Top
Pavement construction with Polyroad is carried out using
the same plant and equipment that is used for pavements incorporating
cementitous binders.
As typically desired in any form of in situ pavement
stabilisation process, two mixing runs are recommended. It is also
recommended the polymer stabilised pavement be compacted at 1 to 2% dry of
optimum moisture content (OMC). Unlike cementitous stabilised materials,
there is no time restriction associated with Polyroad in achieving
specified compaction.
Additionally, Polyroad stabilised materials can be re
mixed, reshaped or re-compacted without loss of dry strength. Typical
spread rates of Polyroad are 1.5 % to 2% by mass. Three (3) Polyroad
products are available depending on material properties.
Back to Top
To determine the suitability of Polyroad for stabilisation, test such
as plasticity index, grading, maximum dry density and optimum moisture
content should be undertaken.
Additional testing that clearly highlights Polyroad's superior
performance can be seen from the waterproofing effect when tested in
accordance with AS 1141.53 - Absorption, Swell and Capillary Rise (compare
with untreated sample and if desired, with a sample treated with lime
only).
Testing can also be carried out to assess CBR strengths - comparative
testing with and without Polyroad, both soaked and unsoaked (compare with
untreated sample and if desired, with a sample prepared with lime only).
Back to Top
Pavement thickness can be determined in exactly the same manner as for
unbound flexible pavements. However, a history of successful performance
in the field has shown that reduced pavement thickness has continued to
provide maintenance free service.
For more information Contact Us
Back to Top
| Introduction |
Construction Procedure |
Testing for Suitability |
| Design Considerations |
|
