Microstructure and Behavior of Allophane

水铝英石的微观结构和行为

• 批准号: 61560256
• 负责人: KARUBE Jutaro
• 金额: $ 1.34万
• 依托单位: Ibaraki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61560256/
• 关键词: Voilcanic ash soil; Allophane; Soil colloid; Air-dry; Soil structure; 遊離酸化物

The peculiarity of physical and engineering properties of volcanic ash soil are attributed to the character of allophane and it's microstructure. Therefore, investigation was made on the microstructure and behavior of allophane suspension. The results are as followes.1. Changes of viscosity, turbidity, and microstructure of allophane by air-drying. (1) The dispersivity of allophane suspension is largely affected by the slight change of physico-chemical properties on allophane surface by air-drying under the neutral and alkaline suspension. (2) Nevertheless, the change of the physical and engineering properties of volcanic ash soil by air-drying is considered to be caused by the aggregation of allophane under the natural soil condition (about pH 6). (3)The fact mentioned above was confirmed by the electron microscopic examination.2. The influence of free sesquioxide on the dispersivity of allophane suspension. (1) The season why the non-defferated allophane does not disperse under the alkaline condition cannot be explained by the net particle charge. (2) And the phenomenon was considered to be caused by the rise of isoelectric point, direct interactive function of aluminum polymer, and the heterogenenity of the charge distribution on the allophane surface. (3) Aluminum is considered to be more active agent than iron on the soil flocculation.

火山灰土的特殊物理和工程性质是由水铝英石的性质及其微观结构决定的。因此，对水铝英石悬浮液的微观结构和行为进行了研究。研究结果如下：1.水铝英石风干后黏度、浊度及微结构之变化。(1)在中性和碱性条件下，水铝英石悬浮液经风干后，其表面物理化学性质发生微小变化，从而影响水铝英石悬浮液的分散性。(2)然而，火山灰土风干后物理和工程性质的变化被认为是由水铝英石在自然土壤条件下（pH约为6）的聚集引起的。（3）电镜观察证实了上述事实.游离倍半氧化物对水铝英石悬浮液分散性的影响。(1)未脱镁铝英石在碱性条件下不分散的原因不能用颗粒的净电荷来解释。(2)认为这是由于铝的等电点升高、铝聚合物的直接作用以及水铝英石表面电荷分布的不均匀性造成的。(3)铝被认为是比铁更活跃的土壤絮凝剂。