👉Road Construction Layers Explained 🛣️
🚧A well-designed road is built in multiple layers, with each layer performing a specific function to ensure strength, durability, and a smooth driving surface.
1. Wearing Course (30–50 mm)
The top asphalt layer that comes in direct contact with traffic. It provides a smooth ride, skid resistance, and protects the underlying layers from water and wear.
2. Binder Course (50–100 mm)
Located beneath the wearing course, this layer distributes traffic loads and adds structural strength to the pavement.
3. Base Course (150–250 mm)
Usually made of Wet Mix Macadam (WMM) or Cement Treated Base (CTB). It carries and spreads vehicle loads to the lower layers while providing stability.
4. Sub-Base (150–300 mm)
A granular layer that improves drainage, prevents pumping, and distributes loads uniformly to the subgrade.
5. Compacted Subgrade (300–500 mm)
The prepared and compacted natural soil that serves as the foundation of the pavement. Proper compaction is essential for long-term road performance.
❇️Typical Pavement Thickness:
🚗 Low Traffic Roads: 350–500 mm
🚙 Medium Traffic Roads: 500–700 mm
🚛 Highways/Heavy Traffic: 700–1200+ mm
▶️Note: Pavement thickness depends on traffic volume, axle loads, subgrade CBR, climate, drainage conditions, and applicable design standards (IRC, MoRTH, AASHTO, etc.).
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https://youtube.com/@ethiopianconstruction7?si=ils307xXQQpIdCwG
@etconp
🚧A well-designed road is built in multiple layers, with each layer performing a specific function to ensure strength, durability, and a smooth driving surface.
1. Wearing Course (30–50 mm)
The top asphalt layer that comes in direct contact with traffic. It provides a smooth ride, skid resistance, and protects the underlying layers from water and wear.
2. Binder Course (50–100 mm)
Located beneath the wearing course, this layer distributes traffic loads and adds structural strength to the pavement.
3. Base Course (150–250 mm)
Usually made of Wet Mix Macadam (WMM) or Cement Treated Base (CTB). It carries and spreads vehicle loads to the lower layers while providing stability.
4. Sub-Base (150–300 mm)
A granular layer that improves drainage, prevents pumping, and distributes loads uniformly to the subgrade.
5. Compacted Subgrade (300–500 mm)
The prepared and compacted natural soil that serves as the foundation of the pavement. Proper compaction is essential for long-term road performance.
❇️Typical Pavement Thickness:
🚗 Low Traffic Roads: 350–500 mm
🚙 Medium Traffic Roads: 500–700 mm
🚛 Highways/Heavy Traffic: 700–1200+ mm
▶️Note: Pavement thickness depends on traffic volume, axle loads, subgrade CBR, climate, drainage conditions, and applicable design standards (IRC, MoRTH, AASHTO, etc.).
❇️Please Subscribe Our Youtube Channel👇
https://youtube.com/@ethiopianconstruction7?si=ils307xXQQpIdCwG
@etconp
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