Fly ash가 土壤의 化學性 및 物理性에 미치는 影響을 糾明하기 위하여 Fly ash를 蒸溜水 및 0.5N-acetic acid로 추출하여 각종 無機成分의 溶出量을 測定하고 Fly ash를 土壤에 處理한 경우 土壤物理性의 變化를 調査하였다. Fly ash의 主要結晶鑛物은 mullite와 石英이었다. 蒸溜水보다 Acetic acid로 Fly ash를 抽出할 경우 훨씬 많은 量의 無機成分이 溶出되었다. 이때 Si 및 Al는 蒸溜水에 依해서 거의 溶出되지 않았다. 土壤의 透溶性 및 圃場容水量은 Fly ash를 土壤에 10% 以下 添加하면 向上되었으나 그 以上 處理時에는 低下되었다. 土壤의 伸縮性 및 硬度는 Fly ash를 10% 以下로 處理할 경우 큰 影響을 받지 않았다.

The inorganic constituents in flay ash such as Ca, Mg, Al and Si were extracted by water and 0.5N-Acetic acid, and changes of the physical properties of the fly ash-treated soils were examined to find out the effect of fly ash on the chemical and physical properties of the soils. The dominant day minerals of fly ash were quartz and mullite. More inorganic constituents were extracted from the fly ash by acetic acid than by water. Si and A1 in fly ash were hardly extracted by water. Addition of fly ash to soil below 10%(W/W) caused improvement in the water permeability and the field moisture capacity of the soil, but did not influence the shrinkage and hardness of the soil. Therefore, it was apparent that the effect of the fly ash on the chemical and physical properties of the soils greatly dependedon soil reaction, the organic acid contents, and the amount of fly ash used in treatment.