Physical and Chemical Properties of Reclaimed Land Soils along the Eastern Part of Tokyo Bay

Abstract

This paper deals with the physical and chemical properties of clayey soils reclaimed from Tokyo Bay sediments by sand pump dredging, and a comparison is made with andosol and red and yellow soils.
The reclaimed land soils were found to consist of montmorillonite and to have large surface area, cation exchange capacity, soil pH and electric conductivity, and contained large amount of salts.
The liquid and plastic limits of these reclaimed land soils decreased with drying, desaltation and by treatment with calcium, magnesium, potassium and sodium chloride solution.
The addition of potassium chloride decreased the liquid limit of these soils, since pottasium ions inhibited the infiltration of water within the interlayers of the montmorillonite.
In a soil solution of reclaimed land soil improved with calcium, magnesium, potassium and sodium chloride, potassium ion was distributed in a greater concentration than other ions in the field of higher pF.