Standard subgrade support conditions for rigid pavement ACN calculation
| Subgrade strength category | Subgrade support k-value | Represents | Code designation |
|---|---|---|---|
| High | 150 MN/m3 (552.6 pci) | k ≧ 120 MN/m3 (≧ 442 pci) | A |
| Medium | 80 MN/m3 (294.7 pci) | 60 MN/m3 < k < 120 MN/m3 (221 pci < k < 442 pci) | B |
| Low | 40 MN/m3 (147.4 pci) | 25 MN/m3 < k ≦ 60 MN/m3 (92 pci < k ≦ 221 pci) | C |
| Ultra Low | 20 MN/m3 (73.7 pci) | k ≦ 25 MN/m3 (k ≦ 92 pci) | D |
| Subgrade strength category | Subgrade support | Represents | Code designation |
|---|---|---|---|
| High | 150 MN/m3 (552.6 pci) | k ≧ 120 MN/m3 (≧ 442 pci) | A |
| Medium | 80 MN/m3 (294.7 pci) | 60 MN/m3 < k < 120 MN/m3 (221 pci < k < 442 pci) | B |
| Low | 40 MN/m3 (147.4 pci) | 25 MN/m3 < k ≦ 60 MN/m3 (92 pci < k ≦ 221 pci) | C |
| Ultra Low | 20 MN/m3 (73.7 pci) | k ≦ 25 MN/m3 (k ≦ 92 pci) | D |
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