土の粒度試験について--沖縄の土における分散剤の効果-1-
Year: 1978
Type: article
Abstract: In the case of grain-size analysis test of soils smaller than 2,000 microns-particle size, a sedimentation process using a hydrometer is used. In this procedure, the dispersing agent is used for securing the necessary and accurate data of grain sizes. In JIS procedure-A 1204-1969, usually, sodium silicate (Na₂Si0₃9H₂0) or sodium hydroxide (NaOH) is used as the agent. However, in Okinawa it is thought that, sodium triphosphate (Na₅P₃0₁₀) is more effective for the certain soils to disperse. This paper clescribes a test results of grain-size analysis using some other dispersing agents for Shimajiri Formation soils to get a suitable agent and its procedure. It is shown that sodium hexametaphosphate (NaP0₃)₆ is more effective than others used before for Shimajiri Formation soils.
Authors: 方成 上原, 宜二 周藤, Hōsei Uehara, Yoshiji Sudo
Language: Japanese
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W607093885