Table 1. Properties of loading agents used in Phase 1 overlap joint experiments.
| Loading Agent | % MassIronasFe2O3 | Major FeMineral | % MassSecondaryMinerals | Particle Size Distribution (%) | |||||
| Very coarse sand(1.0–2.0 mm) | Coarse sand(0.5–1.0 mm) | Medium sand(0.25–0.5 mm) | Fine sand(125–250 µm) | Very fine sand(62.5–125 µm) | Silt + Clay(<62.5 µm) | ||||
| Coarse GroundSpecularite* | Unknown* | α-Fe2O3 * | Cu5(PO4)2(OH)4 * | 15.08 | 12.08 | 8.01 | 8.01 | 19.14 | 37.68 |
| Cu2 (PO4)(OH)* | |||||||||
| α-FeO(OH)* | |||||||||
| Hoover PT PrimerNatural Red | 97.5 | α-Fe2O3 | Al2O3 = 1 | 0 | 0 | 0 | 0 | 0 | 100 |
| SiO2 = 1.5 | |||||||||
| Hoover P3 PrimerNatural Red | 80 | α-Fe2O3 | SiO2 = 9 | 0 | 0 | 0 | 0 | 0 | 100 |
| Al2O3 = 6 | |||||||||
| MgO = 1 | |||||||||
| CaO = 1 | |||||||||
| Hoover GRD NaturalYellow | 95–96 | α-FeO(OH) | SiO2 = 4–5 | 0 | 0 | 0 | 0 | 0 | 100 |
| Hoover GRD548OCH | 57–60 | α-FeO(OH) | SiO2 = 21–24 | 0 | 0 | 0 | 0 | 0 | 100 |
| H2Mg3(SiO3)4 = 3–4 | |||||||||
| MgCO3 = 2.5–3.5 | |||||||||
| Sigma-Aldrich SiliconDioxide #S5631 | 0 | None | SiO2 = 100 | 0 | 0 | 0 | 0 | 0 | 99∧ |
*Mineral composition was reported by the manufacturer for all loading agents except Coarse Specularite which was produced in-house and analyzed using a Rigaku D/Max Rapid Micro X-ray Diffractometer with AreaMax 2.0 and JADE 8.0 software. The major phase detected by the XRD analysis was identified as the Major Fe Mineral and the minor phases as the Secondary Minerals.
∧100% of particles were silt and clay-sized based on sieving but the manufacturer reported 1% colloidal particles.