Citation: | XUE Xiaofeng, LIU Honglei, ZHANG Shuai, MENG He, QUAN Yapeng. Optimization of material ratio of curtain grouting based on alkali suppression[J]. Hydrogeology & Engineering Geology, 2025, 52(4): 159-167. doi: 10.16030/j.cnki.issn.1000-3665.202501042 |
To investigate the regulatory mechanisms of low-alkalinity admixtures on the performance of clay-cement slurry in mine water hazard prevention and curtain grouting engineering, this study employed an orthogonal experimental design. The rheological properties of the slurry, including flowability, pumpability, setting time, and pH evolution, were systematically analyzed under varying mix conditions. By introducing phosphogypsum, fly ash, and the SJP admixture, the effectiveness of these materials in reducing the alkalinity of the slurry was evaluated. The results reveal that phosphogypsum effectively reduced the pH to 11 and prolonged extending the setting time. Although fly ash showed limited efficacy in alkalinity reduction, it significantly enhanced the pumpability of the slurry and shortened the pumping period. The SJP admixture demonstrates outstanding performance in both pH reduction and pumpability extension, with the pH decreasing notably to 8 when the dosage is increased from 2.5% to 3.5%. Based on experimental data, an optimized formulation of the SJP admixture, clay, phosphogypsum, and cement (CCAS) is developed. Orthogonal tests identify the optimal proportions as follows: composite acid salt 0.5%, calcium sulfoaluminate 1.5%, phosphogypsum 10.0%, and clay 50.0%. The optimized slurry achieves a significant reduction in pH to 10, maintains a flowability of 18–23 cm, and extends the pumpability window to 100–220 minutes, fully meeting the engineering application requirements. This study provides a scientific basis for controlling slurry alkalinity in curtain grouting projects, thereby mitigating environmental pollution.
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Flow test mold of cement paste
Flowability and pumpability tests
Range of the influence of each factor on the slurry performance
Test samples