Material | Quartz sanda | Corundum sandb | Feldspar sandc |
---|---|---|---|
Grain size (ø) | 60–250 μm | 88–125 μm | 100–250 μm |
Grain density (ρspecific) | 2650 kg/m3 | 3960 kg/m3 | ca. 2650 kg/m3 |
Density (sieved) (ρsieved) | 1560 kg/m3 | 1890 kg/m3 | 1300 kg/m3 |
Internal peak friction angle (φp) | 36.1° | 37° | 33° |
Dynamic-stable friction angle (φp) | 31.4° | 32.2° | 29.7° |
Reactivation friction angle (φp) | 33.4° | 33.8° | 32° |
Cohesion (C) | 9 ± 98 Pa | 39 ± 10 Pa | 5–10 Pa |