Effects of aluminum on mechanical properties of clayey soils

摘要

Examination was made of the effects of hydroxy-aluminum as an stabilizing agent on the mechanical properties of clayey soils. Aluminum contributes remarkably to a soil structure, but has less direct effect on soil strength. Increase in hydraulic conductivity by formation of the soil structure accelerates the rate of soil dehydration, and thus soil strength was expected to be improved rapidly. This is important and effective in practical use since difficulty lies in the early stage of dehydration in the case of clayey soil. A suitable amount of hydroxy-aluminum was found to be 25% of CEC, or 4-6 g kg~(-1) of Al to oven-dried soil, and almost no effect was found with excess application. Unconfined compression test was done using inundated soil samples to eliminate the effects of matric potential on soil strength, which was found to increase somewhat by the addition of hydroxy-aluminum.