Standard Test Method for ParticleSize Analysis （ParticleSize分析的标准试验方法）.PDFVIP

Designation: D 422 – 63 (Reapproved 1998) Standard Test Method for Particle-Size Analysis of Soils1 This standard is issued under the fixed designation D 422; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval. 1. Scope stirring device in which a suitably mounted electric motor turns 1.1 This test method covers the quantitative determination a vertical shaft at a speed of not less than 10 000 rpm without of the distribution of particle sizes in soils. The distribution of load. The shaft shall be equipped with a replaceable stirring particle sizes larger than 75 µm (retained on the No. 200 sieve) paddle made of metal, plastic, or hard rubber, as shown in Fig. is determined by sieving, while the distribution of particle sizes 1. The shaft shall be of such length that the stirring paddle will operate not less than 3 1 smaller than 75 µm is determined by a sedimentation process, ⁄ 4 in. (19.0 mm) nor more than 1 ⁄ 2 in. using a hydrometer to secure the necessary data (Note 1 and (38.1 mm) above the bottom of the dispersion cup. A special Note 2). dispersion cup conforming to either of the