41 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 long-distance 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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