This video captures a common but critical road maintenance task—asphalt patching, where a hot asphalt mix is used to repair damaged or worn-out road surfaces. Using a hydraulic excavator, workers spread the hot mix evenly over a pre-treated area, preparing it for compaction.---
🔬 The Science Behind Asphalt Repair:
Hot mix asphalt (HMA) is a blend of:
Bitumen (a petroleum-based binder)
Crushed stone and sand (aggregate)
Heated to around 150–170°C, this mix stays pliable enough to flow into cracks and bond with the existing surface. Once cooled and compacted, it forms a dense, durable layer resistant to weather, traffic, and moisture.
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🔧 Key Steps in the Repair Process:
1. Surface Preparation – Loose debris and old asphalt are cleared to ensure a clean bond.
2. Tack Coat Application – A bitumen emulsion layer improves adhesion between old and new layers.
3. Hot Mix Placement – Delivered and spread using machinery like the excavator in the video.
4. Compaction – Rollers compress the material to remove air gaps, increasing strength and longevity.
📊 Good compaction increases asphalt density to 92–96%, essential for durability and water resistance.
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🌍 Why It Matters:
Potholes and cracks weaken road safety and increase vehicle wear. This method offers a cost-effective, time-saving solution that can last for several years if done properly.
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This isn't just a road fix—it's applied physics and engineering in action.
Modern infrastructure relies on such practical, science-backed methods to keep the world moving.
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