リン酸による土壌の安定処理 第一報 粘土鉱物に対するリン酸の作用
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概要
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The mechanism of clay soils with phosphoric acid was investigated by unconfined compressive strength, phosphrous fixation, X-ray diffraction analysis, infrared absorption analysis, differntial thermal analysis and others. As the result of phosphoric acid treatment of various clay minerals and soils, it was recognized that the degrees of improvement depend on the types and crystallinities of clay minerals. Chlorite minerals appeared to be most reactive of clay minerals even when the highly-crystalline samples. The poorly-crystalline kaolin minerals were much reactive, while the highly-crystalline samples were not so. Illite and montmorillonite were reactive when the degrees of their crystallinities were very poor. The phosphoric acid attacks the clay mineral structures and produce a gel with Al and Fe, which causes the cementation of soil particles. The DTA curves of clay minerals treated with phosphoric acids frequently showed the sharp exothermic peaks at the temperatures between the begining and the maximum of (OH) dehydration peaks. The X-ray diagrams of treated samples of kaolinite which have the exothermic peak of DTA curve show new peaks when samples were heated to the temperatures of the exothermic peaks, on the other hand, a gel which was isolated from the sample changes to the same crystalline structure even when heated at 105℃. This shows the presence of a bond between a gel and clay minerals.
- 日本粘土学会の論文
- 1965-08-01