Asphalt surfaces are durable and widely used across road networks and commercial areas, but even the best-laid asphalt isn’t immune to the ageing process. One of the earliest signs of deterioration is oxidation—a silent, progressive issue that can lead to major surface failure if not addressed early. For clients working with Barossa Road Valley Tech SA in Barossa Road Valley, SA, identifying asphalt oxidation early can mean the difference between routine maintenance and expensive reconstruction.
What Is Asphalt Oxidation?
Asphalt oxidation is a chemical process where the binding agents in bitumen—particularly the oils—break down when exposed to oxygen, sunlight, and fluctuating temperatures. Over time, the once-flexible bitumen becomes brittle and loses its binding strength, making the surface more prone to cracking, raveling, and water ingress.
Why Early Detection Matters
By the time deep cracks and potholes form, the oxidation has often already done significant damage to the surface integrity. Identifying the early signs allows you to apply preventative measures that are cost-effective and far less disruptive than major repairs.
Early Warning Signs of Asphalt Oxidation
Fading Colour
One of the most visible signs is a shift in colour. Fresh asphalt appears dark black, but as oxidation progresses, it becomes:
- Dull grey or brownish
- Chalky or dusty in appearance
- Less uniform in surface tone
Surface Brittleness
As the surface oxidises, it hardens and loses flexibility. This causes:
- Small surface cracks (especially in high-traffic or exposed areas)
- Granule loss on the surface
- A dry, coarse texture when compared to newer asphalt
Hairline Cracking (Alligator Cracks)
Oxidation commonly precedes the formation of alligator cracking, where fine, interlinked cracks form in a pattern. These cracks often appear:
- Near joints and seams
- Along high-load or turning areas
- In patches where drainage is poor
Water Absorption and Pooling
Healthy asphalt should repel water effectively. Once oxidation sets in:
- The surface becomes more porous
- You may notice water soaking in rather than running off
- Pooling can occur more often, especially in worn sections
What Can Be Done About It?
At Barossa Road Valley Tech SA, early intervention is central to prolonging surface life. If oxidation is caught early, options include:
Sealcoating
- Restores lost oils and slows oxidation
- Protects against UV rays and water ingress
- Enhances appearance with a deep, black finish
Crack Sealing
- Prevents small cracks from growing
- Keeps moisture from entering and freezing below the surface
- Extends the life of oxidised but structurally sound areas
Surface Overlay
- Adds a fresh asphalt layer to rejuvenate the pavement
- Suitable where oxidation is advanced but base layers are intact
- Minimises the cost compared to full-depth replacement
Regular Inspections Are Key
Routine assessments by professionals help identify oxidation before it reaches critical stages. A trained eye can assess:
- Oxidation depth and rate of spread
- Associated structural issues (like drainage or base instability)
- Whether restoration or replacement is the best course
Conclusion
Oxidation is an unavoidable aspect of asphalt’s lifespan—but early detection and action can greatly reduce repair costs and prevent long-term surface damage. At Barossa Road Valley Tech SA in Barossa Road Valley, SA, we understand how to evaluate and treat oxidised surfaces using the most appropriate techniques for long-term results. If you suspect your asphalt surface is showing signs of age, now is the time to act.
Call us on: 08 5122 4216
Click here to find out more about Barossa Road Valley SA
Click here to complete our contact form and see how we can help with your roofing needs.
