Introduction
Maintaining our roads is a continuous effort, and one of the most effective preventive measures is crack sealing. This technique, often under-appreciated, can extend pavement life, reduce repair costs, and improve driving conditions. In this post, we’ll explore what crack sealing is, how it’s applied, when it’s suitable (and when it isn’t), and what causes cracks in the first place.
What is Crack Sealing?
Crack sealing is a preventive maintenance technique used to keep water and debris out of pavement cracks. When water infiltrates cracks, it can weaken the base and sub-base layers, leading to more severe pavement issues such as potholes. Crack sealing involves filling these cracks with a hot, rubberized sealant to create a barrier against moisture, thus preserving the structural integrity of the pavement.
How Do Cracks Form?
Cracks are inevitable due to a variety of natural and external factors:
• Thermal Expansion and Contraction: Pavement expands in heat and contracts in cold, leading to stress that eventually causes cracks.
• Traffic Loads: Constant pressure from vehicles, especially heavy trucks, can weaken pavement and create stress points.
• Moisture Penetration: When water seeps into the pavement, it softens the layers beneath and leads to cracks, which can widen over time.
• Ageing and Oxidation: Over time, the pavement naturally loses flexibility, making it more susceptible to cracking under stress.
How to Apply Crack Sealing
1. Inspect and Clean Cracks
First, examine the pavement for cracks. Once identified, use a brush or compressed air to remove any loose debris, dirt, or vegetation. Proper cleaning ensures that the sealant adheres effectively.
2. Prepare the Sealant
Crack sealants are typically heated to specific temperatures to ensure optimal flow into cracks. Hot-applied rubberized sealants are common, as they expand and contract with temperature changes.
3. Fill the Cracks
Using a crack-sealing applicator, apply the sealant along the crack’s entire length. For best results, fill the crack slightly above the pavement level, allowing it to settle and bond.
4. Allow Time to Cure
Sealant needs a short period to cool and harden. Once cured, the pavement is ready for traffic.
When Should Crack Sealing Be Used?
Crack sealing is best applied
• Early in a Crack’s Lifecycle: Addressing cracks promptly, especially within the first year, can prevent them from widening.
• Before Winter or Rainy Seasons: Moisture accelerates pavement deterioration, so sealing cracks ahead of these seasons is ideal.
• On Pavements with Minimal Structural Damage: Crack sealing works best on pavements with isolated cracks rather than extensive, interconnected cracking, which may require more intensive repairs.
When NOT to Use Crack Sealing
• On Pavements with Extensive Damage: If the pavement has reached a stage where cracks are interconnected (alligator cracking), or the surface is severely worn, it may need patching or resurfacing instead of crack sealing.
• During Extreme Temperatures: Crack sealing is most effective in moderate weather, as very cold or hot conditions can interfere with the sealant’s application and curing.
FAQs: What Else Should You Know About Crack Sealing?
Q: How does crack sealing support sustainability?
A: By sealing cracks early, we extend the road’s lifespan and reduce the need for large repairs, conserving resources and minimizing environmental impact.
Q: How does crack sealing impact road users?
A: Crack sealing requires minimal downtime and typically allows traffic to resume shortly after application. It’s a low-impact repair compared to more extensive pavement treatments.
Q. How Long Does Crack Sealing Last?
A. Typically, crack sealing can extend pavement life by 3 to 5 years. However, the actual lifespan depends on factors like traffic load and environmental conditions.
Q. Is Crack Sealing Cost-Effective?
A. Yes, crack sealing is one of the most cost-effective preventive maintenance techniques. By filling cracks early, municipalities and property owners can avoid more expensive repairs down the line.
Q. Can I Crack Seal Myself?
A. While some DIY products are available, professional crack sealing services are recommended for roads and commercial properties, as they ensure proper application and use high-quality materials.
Q: How much does crack sealing typically cost?
A: The cost of crack sealing usually ranges from $0.35 to $0.75 per square foot, depending on factors like the type of sealant, project size, and location.
Conclusion: The Long-Term Benefits of Crack Sealing
Crack sealing is a simple yet highly effective preventive maintenance method. By sealing cracks early, we can protect roads from water damage, reduce long-term repair costs, and maintain safer, more durable pavements. When done correctly, crack sealing offers municipalities, businesses, and property owners a sustainable way to manage their pavement assets, extending their lifespan and ensuring they remain in optimal condition.
If you’re interested in protecting your pavement investment through crack sealing, don’t hesitate to reach out.
Our experts are here to assess, guide, and apply this effective maintenance technique to keep your roads in top shape.
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