While asphalt is well known for its durability and versatility in paving applications, it is not immune to environmental stresses, particularly the sun. Prolonged exposure to ultraviolet (UV) rays can quickly deteriorate asphalt surfaces, leading to a host of structural and aesthetic issues. Fortunately, regular sealcoating offers a strong solution to mitigate these effects. Andersen Asphalt & Striping would like to explore how the sun damages asphalt and how sealcoating can protect and extend the life of asphalt pavements.
Effects of UV Radiation on Asphalt
The sun can have a number of effects on asphalt surfaces. Here are some of the negative effects UV rays has on asphalt:
• Oxidation and Binder Degradation: UV rays accelerate the oxidation process of the bitumen binder in asphalt. This oxidation causes the binder to become brittle and lose its elasticity, which is essential for allowing the asphalt to expand and contract without cracking. As the binder degrades, the asphalt surface starts to crack and crumble, leading to premature aging.
• Color Fading: Just like other materials exposed to the sun, asphalt can fade over time. The once dark, rich black color of fresh asphalt turns to a dull, lifeless gray. This not only affects the curb appeal but also the surface’s ability to absorb and radiate heat effectively.
• Surface Raveling: The loss of flexibility in the asphalt binder due to UV exposure can cause the aggregate particles on the surface to loosen and disintegrate, a process known as raveling. This results in a rough and uneven surface that can compromise vehicle traction and pedestrian safety.
• Increased Surface Temperature: Faded, oxidized asphalt absorbs more heat, leading to higher surface temperatures. This not only contributes to the urban heat island effect but can also make the surface uncomfortable or even hazardous to walk on during hot weather.
Protective Benefits of Asphalt Sealcoating
Sealcoating is not just aesthetic. It also serves as an essential maintenance technique to shield asphalt from the harsh effects of the sun and other environmental factors. Here’s how sealcoating benefits asphalt surfaces:
• UV Protection: Sealcoating acts as a barrier against UV rays, greatly slowing the oxidation process of the asphalt binder. By protecting the binder, sealcoating helps maintain the flexibility and integrity of the asphalt surface, thus preventing premature cracking and aging.
• Restores Asphalt Appearance: A fresh sealcoat application revives the appearance of faded asphalt, restoring it to its original dark color. This not only enhances the visual appeal but also improves the surface’s heat radiation capabilities, keeping it cooler during sunny days.
• Prevents Water Penetration: While the primary focus here is on sun damage, it’s important to note that sealcoating also prevents water penetration, another important element in asphalt degradation. By sealing cracks and surface pores, sealcoating ensures that water doesn’t seep into and damage the sub-base of the pavement.
• Cost-Effective Maintenance: By extending the life of the asphalt and reducing the need for frequent repairs, sealcoating proves to be a cost-effective maintenance strategy. It saves property owners significant money in the long run by delaying costly resurfacing and reconstruction projects.
Asphalt Parking Lot & Road Pavement Resurfacing, Replacement & More in Reno, Elko, Henderson, North LV, Paradise, Spring Valley, Sunrise Manor, Las Vegas, NV | State of Nevada
The sun’s UV rays pose a significant threat to the longevity and functionality of asphalt surfaces. However, with the application of sealcoating, these detrimental effects can be effectively diminished. Sealcoating not only preserves the structural integrity of asphalt but also enhances its appearance, making it an essential practice for anyone looking to maintain durable and visually appealing asphalt surfaces. For sealcoating and other asphalt services, contact Andersen Asphalt & Striping today.
