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Pavement Preservation Pilot Project

As asphalt ages, it becomes brittle and cracked. These cracks can turn into potholes and eventually require a complete removal and repair of the road surface.

The City is trying an innovative pavement treatment to restore and rejuvenate the surface of the asphalt at a fraction of the cost of repaving. The result of this treatment increases the road lifecycle by approximately five years at 10 per cent of the cost of regular maintenance and can be done twice on a road surface. This is part of our long-term preventative maintenance strategy to help improve the overall quality of our roads. This treatment is used when:

  • There are no ruts or settlements in the pavement.
  • The road is free of potholes and wide cracks.
  • The road is structurally sound.
  • The temperature is between 15 and 30 degrees Celsius with no rain or strong winds.

This technique has five main components:

  1. Sweeping the road
  2. Spraying sealant and then allowing it to penetrate the pavement
  3. Spreading sand overtop of the sealant
  4. Pushing the sand/sealant mixture into small cracks with roller attached to a truck
  5. Sweeping the excess sand off using a street sweeper

What you can expect to happen on the street:

  • Before the treatment, potholes and wide cracks are fixed.
  • The street will be closed to traffic.
  • The street is swept by a street sweeper to remove clay, sand, gravel or debris.
  • The sealant is sprayed on the road and left to dry.

It’s important to stay off the road during this phase. Please do not drive, walk, or bike on the street surface during this phase.

  • Next, sand is applied. It’s swept and pushed into the small cracks to help reseal the road surface. This looks like we dumped a sandbox on your street and it is normal.
  • Later the same day, the road is open to traffic. You can drive on the road at this stage.
  • A few days later, the extra sand is swept off the road using a street sweeper.


Questions & Answers

How will I know if I can drive on my street?

You can drive on the street when there are no barricades.

A crew sprayed my street and then left. Why did they not finish the job?

This is to allow the liquid to set properly.

How long will my road be closed?

This treatment is typically complete within one day, weather permitting.

Why is this different than other techniques?

Sweep the road; spray with sealant; let it sit; dump sand on it, hand sweep the sand into the cracks and we let that sit for two days, working its way into the sealant. Then we come back and sweep off the extra sand. This is consistent with our approach to apply the right treatment at the right time to help extend the lifecycle of our assets.

This technique is environmentally-friendly and less invasive. In fact, the process only takes about four hours, so the roads will be available for traffic quickly

What are the cost-savings to this treatment?

The result of this treatment increases the road lifecycle by approximately five years at 10 per cent of the cost of regular maintenance and can be done twice on a road surface.

How much is this pilot going to cost and how is it funded?

This pilot program will cost $350,000. Funds were allocated from the existing paving maintenance program.

How much pavement are you testing on this year?

We plan to treat approximately 260,000 m2 of pavement.

Where streets are piloting this project?

There are 20 locations scheduled.