Memoirs of the Graduate School of Science and Engineering Shimane University. Series A

number of downloads : ?
Memoirs of the Graduate School of Science and Engineering Shimane University. Series A 36
2002-12-24 発行

土の粒度分析結果に及ぼす試験条件の影響

Effects of Testing Conditions on the Grain Size Analyses of Soils
Kamei, Takeshi
File
Description
  Since the entire clay fraction of soils exists in the form of flocs, the type and quantity of dispersing agents used plays a decisive role in obtaining the percentage of clay-sized material in samples. To investigate the effects of testing conditions on the grain size analyses of soils, Japanesc Industrial Standard (JIS) and X-ray methods were conducted on four different types of soils with different dispersing agents and quantities.
As a result, the most suitable dispersing agents and their optimum quantity have been identified. The clay size fraction detemined a Kaolin by the JIS method is markedly affected by the formation of flocs. Consequently, analytical results obtained by the X-ray method are signlicantly more accurate than those which were obtained by JIS. It was reconimed that the main advantages of the X-ray method in engineering practice are its simphlicity, reproducibility, and speed. It also has the added advantage of tully-automated operation for grain size analysis control and data management.