Recently, researchers have conducted investigations with the possibility of utilising fly ash as a barrier material, which is justified by its chemical, physical and mechanical properties. The mean necessary characteristic, which should be tested is coefficient of permeability. The diversification of test methods and sample preparation techniques can significantly change test results. The purpose of the article is to describe the fly ash permeability in dependence on compaction and moisture content at compaction, as a material embedded into the sealing layer of storage yards. The impact of sample saturation on hydraulic conductivity is shown too. The hydraulic conductivity was investigated for unsaturated and fully saturated fly ash samples, which had been compacted by the Standard and Modified Proctor methods at various water contents, ranging over optimum water content ± 5%. The lowest values of hydraulic conductivity were obtained at the highest moisture contents w = w_opt + 5%, for both compaction methods. It is proven that compacted fly ash, in spite of its likeness to non-cohesive soils, must be assessed while considering water content during compaction, as in the case of compacted cohesive soils.

中文翻译：

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粉煤灰作为阻隔材料的水力传导性：确定中的一些问题

最近，研究人员进行了研究，以利用粉煤灰作为阻隔材料，其化学，物理和机械性能是合理的。应测试的平均必要特性是渗透系数。测试方法和样品制备技术的多样化可以显着改变测试结果。这篇文章的目的是描述粉煤灰的渗透性，它取决于压实度和压实时的水分含量，是一种嵌入储藏场密封层中的材料。还显示了样品饱和度对水力传导率的影响。研究了不饱和和完全饱和粉煤灰样品的水力传导率，这些样品已通过标准和改进的Proctor方法在各种含水量下压实，范围在最佳含水量±5％之内。在最高水分含量下获得最低的水力传导率值 对于两种压实方法，w  =  w _opt + 5％。事实证明，尽管压实粉煤灰与非粘性土壤相似，但必须像压实粘性土壤一样在压实过程中考虑含水量时进行评估。