Analysis of size distribution of soil particles considering floc formation and application to Kumigami [Okinawa, Japan] maaji soil
2005
Katou, T.(Tsukuba Univ., Ibaraki (Japan)) | Adachi, Y.
Effect of floc density on the size distribution of soil sample determined by sedimentation is analyzed by comparing the result of conventional method and that based on the newly proposed method. In the proposed method, the relation between the settling velocity and the diameter of a soil floc determined by the experiment is incorporated into the analysis of pipet method. Experiment was conducted using Kunigami maaji soil picked at the field of sugar cane in Okinawa Island. Two types of soil sample treated with 0.1 M CaCl2 solution and 0.1g/(HPO3)6 solution were prepared. The power law relation between the floc diameter was confirmed from the measurement of the settling velocity against floc diameter. No significant difference in the relation between Vf and Df was found even if the sample was treated in different manner. In the analysis of size distribution, the proposed method was found to give a successful result for the sample treated with CaCl2 solution. However, result in dispersed sample didn't agree with result of microphotograph in a range below 10mum. This inconsistency was interpreted as unique colloidal characteristics of the soil sample.
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