978 tailings cake feeding rate. Admixture dosage was set acoording CPB tonnage production, defining the dose according to mix DP-03 detailed in Table 2. Tables 3 and 4 shows sampled mixes during 2 days full-scale test. Baseline mixes without admixture are labeled as “P” and proposed mixes with admixture are labeled as “A”. It is evident the admixture capability to increase CPB density (more solids in the recipe) while maintaining pumpability according minislump test results registered on field, and binder dosage reduction of 25% (reduction from dose 4% to 3%). Table 3 – CPB full-scale mix trials, Day 1 Sample Code Paste Mix Design Paste density (t/m3) Slump vertical (mm) Cement (%) Admixture (L/t) P-01 P-02 A-01 4.0 4.0 3.0 0.0 0.0 1.0 2.00 2.02 2.07 95 98 96 Table 4 – CPB full-scale mix trials, Day 2 Sample Code Paste Mix Design Paste density (t/m3) Slump vertical (mm) Cement (%) Admixture (L/t) P-03 A-02 4.0 3.0 0.0 1.0 1.96 2.03 99 98 The optimized mixes with reduced cement and water contents flowed stably through the longdistance pipeline without plugging. Measured pump pressures were comparable to, or slightly lower than, those observed with the baseline mix, despite higher solids contents. Operators reported fewer pressure fluctuations and a more consistent flow regime, reflecting the more controlled rheology. Despite lower binder contents, the admixture-modified mixes consistently met the mine’s UCS requirements and, in many cases, exceeded the strengths achieved by the baseline mix. UCS results were monitored in a curing period from 7 to 90 days (Figures 9 and 10). The observed improvements are consistent with the lower water-to-cement ratios and better cement particle dispersion achieved by the admixture, which enhances hydration efficiency in sulfide-rich systems. Figure 9 – CPB full-scale day 1 mixes UCS
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