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<p>The unique chemical properties and hydration behavior of aluminum, combined with the abundance of silicate minerals in loess, render the seepage mechanism of aluminum solutions in loess highly complex. To explore the response mechanism of the permeability of remolded loess to AlCl₃ solutions of varying concentrations, a systematic study was conducted involving permeability tests, Zeta potential measurements, water-soil interaction analyses, and SEM observations. Results showed that the saturated hydraulic conductivity (<i>K</i><sub><i>sat</i></sub>) increased slightly (by 7.6%) under deionized water (DW) seepage due to weak water-rock interactions and pore expansion. Compared to DW, <i>K</i><sub><i>sat</i></sub> increased notably under seepage of 0.001–0.005&#xa0;mol/L AlCl₃ solutions, as Al³⁺ hydrolysis facilitated the dissolution of minerals and the compression of the diffuse double layer, improving pore connectivity. However, as the concentration of Al³⁺ increased, the amount of Al(OH)₃ colloids generated rose, which slightly reduced pore space and caused a weak downward trend of final <i>K</i><sub><i>sat</i></sub>. Under seepage of a 0.01&#xa0;mol/L AlCl₃ solution, the high concentration of Al³⁺ intensified hydrolysis, initially expanding pore spaces. However, as seepage progressed, the aggregation of Al(OH)₃ colloids produced due to hydrolysis caused significant pore blockage, resulting in an initial increase followed by a decrease in <i>K</i><sub><i>sat</i></sub>. Under seepage of a 0.1&#xa0;mol/L AlCl₃ solution, the large amount of Al(OH)₃ colloids formed due to intense hydrolysis almost completely blocked intergranular pore spaces, Limiting seepage to just 0.5 days. These findings provide theoretical insights to support engineering applications in loess regions.</p>

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Response mechanism of permeability of remolded loess to AlCl3 concentration: a new discovery

  • 期刊论文

  • 发表日期：

    2025年9月6日

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  • Qiming Wang,
  • Panpan Xu,
  • Hui Qian

摘要

The unique chemical properties and hydration behavior of aluminum, combined with the abundance of silicate minerals in loess, render the seepage mechanism of aluminum solutions in loess highly complex. To explore the response mechanism of the permeability of remolded loess to AlCl₃ solutions of varying concentrations, a systematic study was conducted involving permeability tests, Zeta potential measurements, water-soil interaction analyses, and SEM observations. Results showed that the saturated hydraulic conductivity (Ksat) increased slightly (by 7.6%) under deionized water (DW) seepage due to weak water-rock interactions and pore expansion. Compared to DW, Ksat increased notably under seepage of 0.001–0.005 mol/L AlCl₃ solutions, as Al³⁺ hydrolysis facilitated the dissolution of minerals and the compression of the diffuse double layer, improving pore connectivity. However, as the concentration of Al³⁺ increased, the amount of Al(OH)₃ colloids generated rose, which slightly reduced pore space and caused a weak downward trend of final Ksat. Under seepage of a 0.01 mol/L AlCl₃ solution, the high concentration of Al³⁺ intensified hydrolysis, initially expanding pore spaces. However, as seepage progressed, the aggregation of Al(OH)₃ colloids produced due to hydrolysis caused significant pore blockage, resulting in an initial increase followed by a decrease in Ksat. Under seepage of a 0.1 mol/L AlCl₃ solution, the large amount of Al(OH)₃ colloids formed due to intense hydrolysis almost completely blocked intergranular pore spaces, Limiting seepage to just 0.5 days. These findings provide theoretical insights to support engineering applications in loess regions.