Everything You Need to Know About Asphalt Paving in Australia
Asphalt paving is a popular choice for both residential and commercial projects across Australia due to its durability, cost-effectiveness, and versatility. Whether you're planning to pave a car park, or roadway, understanding the specifics of asphalt can help you make informed decisions. This article answers some of the most common questions about asphalt paving and offers valuable insights for your next project.
How Long Does Asphalt Paving Last?
The lifespan of asphalt paving largely depends on factors such as traffic volume, weather conditions, and the quality of installation. Generally, asphalt paving can last anywhere between 15 to 30 years if properly maintained. Routine upkeep, such as sealing cracks and preventing water infiltration, can significantly extend its lifespan. Regular maintenance ensures that the surface remains durable and reduces the likelihood of major repairs down the road.
Can You Pave Over Old Asphalt?
Yes, it's possible to pave over old asphalt, a process known as an asphalt overlay. This method involves applying a new layer of asphalt over an existing surface, which can refresh the appearance and extend the life of the pavement. However, it's important that the old asphalt is in relatively good condition—free from major cracks, potholes, or drainage issues. In some cases, repairs such as patching, SAMI (Strain alleviating membrane interlayer) Seal, edge plaining and shape correction may be required prior to overlaying. This is to ensure a smooth, long-lasting finish. Learn more about how Elite Roads can help with asphalt paving.
Is Asphalt Better Than Concrete?
Asphalt and concrete are both widely used for paving, but they have different advantages depending on the application:
Cost: Asphalt is generally cheaper to install than concrete.
Maintenance: Asphalt requires more frequent maintenance, such as sealing, but is easier to repair. Concrete, on the other hand, is more durable but harder to repair if damaged.
Flexibility: Asphalt is more flexible, making it less prone to cracking in extreme weather conditions. Concrete is more rigid and can crack due to temperature fluctuations.
For most local roads and freeways, asphalt is preferred because of its cost-effectiveness and ease of maintenance.
Can You Put Asphalt on Top of Dirt?
No, you cannot simply lay asphalt directly on top of dirt without the proper base layers and preparation to ensure it lasts. A strong, stable base is crucial for the longevity of asphalt paving. Typically, a base layer of compacted crushed stone or gravel is placed first to provide a solid foundation. This base helps prevent settling, cracking, and other issues that could compromise the pavement’s structure. Without this preparation, asphalt laid directly on dirt will quickly deteriorate.
How Thick Should the Asphalt Be for a Driveway?
The thickness of asphalt for a driveway typically depends on the amount of traffic it will endure. For most residential works, a thickness of 50-70 mm is standard. However, if the local roadway will be exposed to heavy vehicles, like trucks, you may need a thicker layer— up to 100 mm —for added durability. For commercial applications, the asphalt may need to be even thicker and multiple layers may be necessary to withstand constant or heavier traffic loads.
How Long Will an Asphalt Overlay Last?
An asphalt overlay can extend the lifespan of your pavement by 8 to 15 years, depending on the condition of the underlying asphalt and how well the overlay is maintained. Regular sealing and minor repairs will help keep the overlay in good shape, ensuring that it performs well over time.
What's the Difference Between Asphalt and Tarmac?
Many people use the terms asphalt and tarmac interchangeably, but they are not the same. Tarmac, short for tarmacadam, was an older road surfacing material made by mixing crushed stone with tar. It has largely been replaced by asphalt, which is made by mixing aggregates with bitumen, a petroleum by-product. Asphalt is more durable, cost-effective, and environmentally friendly than tarmac, making it the preferred choice for modern road construction and paving projects.
Can You Put a Thin Layer of Asphalt Over Old Asphalt?
Yes, you can apply a thin layer of asphalt over old asphalt in a process called surface dressing or a thin overlay. This method is suitable for resurfacing roads or driveways that are in good condition but need a refresh. However, if the existing asphalt has significant structural damage, a thicker overlay or complete resurfacing may be required. A thin overlay can extend the life of the pavement by sealing minor cracks and improving the surface’s appearance.
Conclusion
Asphalt is a versatile and durable material that offers a range of benefits for both residential and commercial projects. Whether you’re looking to extend the life of an existing surface with an asphalt overlay, need road repairs or a brand new installation, Elite Roads can help. Our expertise in asphalt paving ensures that we deliver high-quality results tailored to your specific needs. Contact us today to learn more about how we can make your project a success.
By understanding the basics of asphalt paving, including its lifespan, application over old surfaces, and how it compares to other materials, you can ensure that your investment stands the test of time.