This month we review happenings, look more closely at unsealed pavements, including basic design lab testing.
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News from the Centre of Stabilisation expertise in Australia

A monthly newsletter informing you of initiatives and happenings in the stabilisation industry in Australia

Dear <<First Name>>

Welcome to AustStab's 19th newsletter. In December 2013:
  • Leah attended the ARRB Unsealed Road Symposium in Cairns;
  • We completed audits in Queensland;
  • We continued discussions in the West Coast about re-establishing a working group for WA;
  • We welcomed two new contracting member applications which are to be reviewed by the Standards Working Group in mid January 2014;
  • We held working group meetings for the Training and Promotions Working Group;
  • We participated in Australian Standards and ARRB document reviews;
  • We held the final Council meet for 2013; and
  • We continued to deliver on the pillars of the association.

We wish you a happy holiday season and look forward to providing you with more stabilisation news and expertise in 2014!

Greg White

Unsealed Roads
Unsealed roads often make up over 50% of a LGA road network. With the financial restraints, increased traffic volumes and weights, local government agencies often have difficultly satisfying community expectations.

AustStab has researched the use of stabilisation in unsealed roads.
The main objectives were to:

  • develop a design and construction procedure for unsealed roads;
  • reduce dust;
  • produce a safer pavement in wet conditions;
  • reduce maintenance costs; and
  • produce a high strength pavement.

See Section 13 of the Pavement Recycling and Stabilisation Guide - Unsealed Roads- for more information. Click here for the DOTARS report on unsealed roads.

Laboratory Test Regime - Unsealed Roads

The clay content is critical to selecting the most suitable binder. As a simple guide the initial binder tested should be:

PI < 12 Cement
PI > or = 12 Lime

It should be noted that some clays or materials contaminated with organic matter may not react with lime to an adequate degree.

If the material is very coarse a simple grading should be carried out.

With the binder selected using the PI results, two specimens should be made with 3 and 5%. For higher traffic roads in different rural seasons a UCS of 3MPa is desirable. For most other roads 1 - 2 MPa is suitable.

Click here for more information.

AustStab has many contracting members who are skilled and experienced in the delivery of unsealed pavements.

AustStab material supply members are able to deliver cement, lime, bitumen, polymer products and blends throughout Australia.

Our construction plant members are able to provide fit for purpose plant and machinery to meet the AustStab and Austroads guidelines.

Our consultant member are experienced in the design and construction of stabilised pavements, including unsealed roads.

More information, including contact details for each state and territory in which our members operate, is available on the members register for AustStab.

Click here for more information
Copyright © 2013 AustStab Limited, All rights reserved.

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