Alterations of physical properties and microstructure of marine diatomite owing to variation of diatom content
Alterations of physical properties and microstructure of marine diatomite owing to variation of diatom content
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DOI：
10.1080/1064119x.2022.2046664
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发表时间：
2022-03
影响因子：
2.2
通讯作者：
Yiqing Xu;Xianwei Zhang;Xinyu Liu;Gang Wang
中科院分区：
文献类型：
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作者：
Yiqing Xu;Xianwei Zhang;Xinyu Liu;Gang Wang
摘要硅藻土是一种天然土壤，主要由粘土和硅藻硅藻壳组成，广泛分布于海洋环境中。硅藻硅藻壳的存在赋予了与普通粘土和砂不同的物理性质，例如高阿太堡极限、低密度和高比表面积。然而，硅藻硅藻壳如何影响硅藻的物理性质尚未确定，特别是从微观角度来看。通过对不同硅藻含量的高岭土-高岭土混合物进行室内试验，将硅藻硅藻壳的物理特性和微观结构联系起来。结果表明，硅藻含量对硅藻的物理特性有相当大的影响，并通过显微结构研究解释了这些特征的变化。根据硅藻硅藻壳的特殊物理性质和微观结构，讨论了目前对硅藻在土壤分类中的认识。本研究全面描述了不同硅藻含量对微结构物理特性的影响，揭示了硅藻物理行为的本质。
Abstract Diatomite is a natural soil and comprises mainly clays and diatom frustules and is distributed generally in the marine environment. The presence of the diatom frustules imparts the diatomite physical properties different from those of common clays and sands, such as high Atterberg limits, low density, and high specific surface area. However, how the diatom frustules affect the physical properties of diatomite has yet to be established, especially from a microscopic perspective. This study linked the physical characteristics and microstructure of diatom frustules by performing laboratory tests on diatom–kaolin mixtures with different diatom contents. The results reveal the considerable influence of the diatom content on the physical characteristics of diatomite, with the feature alterations explained by microstructural investigation. The current understanding of diatomite in soil classification is also discussed based on the special physical behaviours and microstructure caused by the diatom frustules. This study provides a comprehensive description of the physical characteristics influenced by different diatom content associated with the microstructure, which reveals the essence of the physical behaviors of diatomite.