Utilization of Flotation Phosphate Tailings and Water Treatment Sludge in Cemented Paste Backfill Based on Phosphate Tailings
The purpose of this study was to assess the effect of flotation phosphate tailings (FPTs) and water treatment sludge (WTS) as a replacement (0–50 wt%) for coarse aggregate on workability, unconfined compressive strength (UCS) and microstructure of the cemented paste backfill (CPB) based on heavy-media phosphate tailings (HMPTs). The slump tests revealed that the fluidity first increased and then decreased, as the FPTs or WTS dosage increased. The bleeding rate tests indicated that the water retention capacity became higher as the FPTs or WTS dosage became larger. The UCS tests demonstrated that the UCS value increased with the increase of the FPTs or WTS dosage and when the fine particle (– μ20 m) was within 25 wt%. The SEM and MIP tests revealed that FPTs and WTS were capable of decreasing the pore volumes with diameters of 1–10 μm and ≥ μ10 m, respectively, when added as the fine aggregate. Overall, compared to WTS, FPTs displayed more profound effects on all conditions described above with the exception of the bleeding rate.
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Document Type: Research Article
Publication date: September 1, 2019
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