Index properties of completely decomposed granite (CDG)
| Index properties | Value |
|---|---|
| Standard compaction tests | |
| Maximum dry density: kg/m3 | 1870 |
| Optimum moisture content: % | 12 |
| Particle-size distribution | |
| Gravel content (>2 mm): % | 19 |
| Sand content (≤2 mm): % | 42 |
| Silt content (≤63 μm): % | 27 |
| Clay content (≤2 μm): % | 12 |
| Specific gravity | 2·60 |
| Atterberg limit | |
| Plastic limit: % | 26 |
| Liquid limit: % | 44 |
| Plasticity index: % | 18 |
| *Saturated hydraulic conductivity, ks | |
| Bare: m/s | 1·4 × 10−6 |
| Grass-only soil: m/s | (4·2 ± 0·8) × 10−7 |
| Tree-only soil: m/s | (3·3 ± 0·6) × 10−7 |
| Mixed tree–grass soil: m/s | (9·6 ± 1·1) × 10−6 |
| †Unified Soil Classification System (USCS) | Silty sand (SM) |
| Index properties | Value |
|---|---|
| Standard compaction tests | |
| Maximum dry density: kg/m3 | 1870 |
| Optimum moisture content: % | 12 |
| Particle-size distribution | |
| Gravel content (>2 mm): % | 19 |
| Sand content (≤2 mm): % | 42 |
| Silt content (≤63 μm): % | 27 |
| Clay content (≤2 μm): % | 12 |
| Specific gravity | 2·60 |
| Atterberg limit | |
| Plastic limit: % | 26 |
| Liquid limit: % | 44 |
| Plasticity index: % | 18 |
| Bare: m/s | 1·4 × 10−6 |
| Grass-only soil: m/s | (4·2 ± 0·8) × 10−7 |
| Tree-only soil: m/s | (3·3 ± 0·6) × 10−7 |
| Mixed tree–grass soil: m/s | (9·6 ± 1·1) × 10−6 |
| Silty sand (SM) | |
According to falling-head hydraulic conductivity test outlined in ASTM (2010b).
According to Unified Soil Classification System (USCS; ASTM, 2010a).
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