Asphalt Layer Thickness Design
Determine optimal asphalt pavement layer thicknesses based on traffic loading, subgrade strength, and design code requirements per AASHTO 1993 / ECP 104
Asphalt Ratio
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% of total
Design Code
AASHTO
1993 Guide
| Traffic Level |
ESALs |
Wearing (mm) |
Binder (mm) |
Asphalt Base (mm) |
Granular Base (mm) |
Subbase (mm) |
Total (mm) |
| Light | < 10⁴ | 40–50 | — | 100–150 | 150–200 | 150–200 | 440–600 |
| Medium-Light | 10⁴–10⁵ | 50 | 50–60 | 120–180 | 200–250 | 150–200 | 570–740 |
| Medium | 10⁵–10⁶ | 50 | 60–75 | 150–200 | 200–250 | 150–200 | 610–775 |
| Medium-Heavy | 10⁶–3×10⁶ | 50 | 60–75 | 180–230 | 200–300 | 150–200 | 640–855 |
| Heavy | 3×10⁶–10⁷ | 50 | 75–90 | 200–260 | 250–300 | 150–200 | 725–900 |
| Very Heavy | 10⁷–3×10⁷ | 50 | 75–100 | 230–300 | 250–300 | 200–250 | 805–1000 |
| Extreme | > 3×10⁷ | 50–75 | 75–100 | 250–350 | 300+ | 200–300 | 875–1125 |
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