Effects of Granular Gradation on the Compressibility and Permeability of Lime-Stabilized Slurry with High Water Content

石灰 泥浆 材料科学 级配 絮凝作用 磁导率 固结仪试验 复合材料 岩土工程 冶金 化学 环境科学 环境工程 地质学 土壤科学 土壤水分 生物化学 计算机科学 计算机视觉
作者
Zhenqi Weng,Yueyue Zheng,Qinhao Zhu,Honglei Sun,Dingyu Ni
出处
期刊:Applied sciences [Multidisciplinary Digital Publishing Institute]
卷期号:13 (7): 4101-4101
标识
DOI:10.3390/app13074101
摘要

Lime stabilization is one of the main methods to achieve efficient treatment and resource utilization of waste slurry. This study investigated the compressibility and permeability of lime-stabilized slurry with different granular gradations based on the ultra-low stress consolidation/permeability test and identified the stabilization mechanism of lime-stabilized slurry with high water content by mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) tests. The test results indicated that (i) lime-stabilized slurry with high water content showed obvious evidence of remolded yield stress and (ii) the remolded yield stress increased with the increasing lime dosage. Lime was found to induce the flocculation of clay to form aggregates through ion exchange, further stabilizing them through the volcanic ash reaction, thus increasing the remolded yield strength of the stabilized slurry. The remolded yield stress of the Hangzhou stabilized slurry with a 1% lime dosage was shown to increase from 0 kPa to 5.71 kPa, while the compression index CS1 decreased by 68.8%. In addition, the pore volumes and diameters of the soil increased once the flocculation was completed, leading to increased permeability of the stabilized slurry. It was, however, observed that the stabilized slurry permeability did not increase infinitely with the increasing lime dosage, but on the contrary decreased once the lime dosage exceeded a certain threshold value. The permeability of the Hangzhou stabilized slurry was found to be one order of magnitude higher than that of the remolded slurry at the optimal dosage. Whereas for slurry with high clay content, the recommended lime dosage was established to be 2% to reduce its compressibility or enhance its permeability; for slurry with high silt content, the recommended lime dosage was ascertained to be 3%.
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