Isolated component testing |
Aggregate | Gravel | Stalite | |
Aggregate Gs | 2.66 | 1.44 (from supplier) | |
Compacted aggregate (Mg m−3) | 1.75 | 0.92 | |
Compacted porosity (m3/m3) | 34% | 36% | |
Soil Gs | 2.67 | 2.67 | |
Compaction testing: | Gravel-base | Stalite-base | Soil |
n = 5 | System | System | Alone |
Compacted density (Mg m−3) | 1.97±0.005 | 1.16±0.005 | 1.76±0.005 |
Replicate volume (m3) | 0.00262 | 0.00262 | 0.00262 |
Total compacted porosity (m3/m3) | 26% | 27% | 34% |
Free Drain Moisture (m3/m3) | 17.9%±0.85 | 19.7%±0.70 | 33.26±0.05 |
Observed gravitational porosity | 8% | 7.3% | 0.74% |
Free drain as % of total porosity | 30.9% | 27% | 2.2% |
Plant dry down study | Gravel-base | Stalite-base | |
n = 15 | System | System | |
Compacted density (Mg m−3) | 2.04 (±0.01) | 1.28 (±0.01) | |
Replicate volume (m3) | 0.00524 | 0.00524 | |
Gravitational drainage moisture* (m3/m3) | 0.116±0.002 | 0.158±0.003 | |
Dry endpoint moisture** (m3/m3 @ 1500 kPa matric tension) | 0.046±0.002 | 0.060±0.002 | |
Plant Available Moisture | 7.0% | 9.8% | |
Infiltration field measure | Gravel-base | Stalite-base | Soil |
n = 3 | System | System | Alone |
Field density (Mg m−3) | 1.98 | 0.80 | 1.78 |
Infiltration rate (cm hr−1) | >60 | >60 | 1.24 |