39 • Real-time pump pressures along the pipeline; • Observations of flow stability and increased dispersion in the mixer; • UCS of field-cast cylinders at 7, 14, 21, 28 and 60 days. Operational data on cement, water and tailings throughput were used to estimate annualized impacts on cement use reduction, water use, tailings utilization and operating costs. 4. RESULTS 4.1 CPB pumpability and strength development, lab test results Laboratory tests results showed that, when the chemical admixture is used in the mix (different testing dosages 1.6-2.7 liters/m3), it is possible to improve pumpability over time in comparison with CPB mix without admixture (Figure 7), while increasing solids content (1.53%), reducing cement content by 25%, reducing water use by 4-10% and increasing tailings use by 6-9% (Table 2). Table 2 – CPB lab mix trials Paste Mix Design DP-01 DP-02 DP-03 DP-04 Percent solids (%) 74.7% 76.2% 77.1% 77.7% Dry weights dosage per m3 HS Cement (Kg) 65 49 49 49 Water (Kg) 507 487 470 458 Tailings (Kg) 1426 1512 1533 1549 Admixture (L) - 1.6 2.2 2.7 Admixture dosage mL/ton Sika® Stabilizer MF 701 - 800 1064 1317 Paste density (t/m3) 2.00 2.05 2.06 2.07 Figure 7 – CPB lab mixes pumpability measurements
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