Road Stabilisation
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Road Stabilisation

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​Your road is about to get a facelift!

You may have seen our engineers doing tests of the road in the past few months, and some preparations like kerb repairs and service lowering recently.
 
We’re getting ready to do a road reconstruction by stabilisation.

What does that mean?

Stabilising is an engineered form of recycling the existing road pavement.  It’s the fastest and most cost effective method of reconstruction. It has the lowest disturbance to locals and usually 100% of the original pavement can be recycled because most of the time, the materials are already there.  It costs a small fraction (around 20%) of other rebuilding methods, but is the same high quality. As a result we can rebuild more and more roads every year.
 

What can you expect?

Stabilising (1-2 days)

Normally, the pavement construction part takes one to two days. Large equipment will be using the street and access will usually be restricted to locals only, under full traffic control. You can usually access your house by car, but there could be small delays. Please do not park on the street on these work days.
 
The road is then turned over, a white powder binder (lime and cement) is added, and it is turned over again a few times and compacted with rollers. It is watered and then trimmed by a grader.

Setting (2-5 days)

The road is left without a seal for the next 3 to 5 days and watered continually to set the binder. Defects like soft spots or cracking can sometimes develop which we will deal with before sealing. Full access and street parking is usually available, under reduced speed.

Temporary sealing (1 day)

The first two seals are sprayed bitumen and stone chip. These provide waterproofing and a temporary seal for the next few months while the binder hardens. The road will be periodically swept but some loose stone will be left around as this actually helps with nesting in the new seal.

Final Paving (after approximately 3 months)

After three months, we will assess the surface and pave over with smooth black asphalt. 
 
Job done!
 

Please remember

  • Don’t park on the street during the stabilising, spray seal or asphalt works. You will be notified by letter box drop prior to each operation
  • Drive slowly on the new surfaces, especially cornering.

 

Questions you may have

Why isn’t all the kerb and gutter being replaced? 

K&G is only replaced for engineering reasons – for example bad drainage, leaking and serious displacement.

Who does the stabilising work? 

Contractors engaged by Council under competitive tender.  We continually assess contractor performance for best quality and price.

What’s in the white powder you use in the stabilisation? 

It’s basically about half lime and half cement and is very fine.  Sometimes it settles on the footpath and around but can be hosed off. 

The work is finished but you left it with a really rough surface and loose stones. Why isn’t it nice and smooth?

This is the temporary spray seal finish. It will be a bit rough until the stone settle into the binder. The binder needs time to harden before the final seal can go on. We understand it’s not the best surface but there’s no way to speed up the process.

When will it be finished? 

Three months is usually how long it takes for the binder to harden enough to be ready. Once we’ve inspected it and it’s good to go, we’ll cover it in smooth asphalt.

Why is the stone surface so easily damaged by car tyres?

Initially the bitumen and binder in the stones take a few weeks to settle and this is often livened up on hot days, and with power steering and turning.  This surface is only temporary and should not affect the final asphalt surface.

How long will it last? 

The asphalt surfacing should last 10 to 15 years. The pavement underneath should last at least 20 years until it is stabilised again.

Should there be any mess left in the street? 

Ideally, no. But sometimes some white binder, loose stone and wheel tracking are common as the binder goes to work. The contractor is responsible for cleaning of the site and any mess or spills should they occur, and we will follow up each day to ensure the best and safest possible site conditions are maintained.

If you have any questions, concerns or comments please call Customer Service on (02) 4227 7111 or email CustomerService@wollongong.nsw.gov.au.
 
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