ASTM D6913-04 pdf free download.Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis.
1.1 Soils consist of particles with various shapes and sizes. This test method is used to separate particles into size ranges and to determine quantitatively the mass of particles in each range. These data are combined to determine the particle-size distribution (gradation). This test method uses a square opening sieve criterion in determining the gradation of soil between the 3-in. (75-mm) and No. 200 (75-urn) sieves.
1.2 The terms, soils and material, are used interchangeably throughout the standard.
1.3 In cases where the gradation of particles larger than 3 in. (75 mm) sieve is required, Test Method D 5519 may he used.
1 .4 In cases where the gradation of particles smaller than No. 2(X) (75-urn) sieve is required, Test Method D 4222 may be used.
1.5 Typically, if the maximum particle size is equal to or less than the 4.75 mm (No. 4 sieve), then single-set sieving is applicable. Furthermore, if the maximum particle size is greater than the 4.75 mm (No. 4 sieve) and equal to or less than the 9.5-mm (¼-in sieve), then either single-set sieving or composite sieving is applicable. Finally, if the maximum particle size is equal to or greater than 19.0 mm (3/4-ifl sieve), Composite sieving is applicable. For special conditions see
10.3.
1.6 Two test methods are provided in this standard. The methods differ in the significant digits recorded and the size of the specimen (mass) required. The method to be used may be specified by the requesting authority; otherwise Method A shall be performed.
1.6.1 Method A—The percentage (by mass) passing each sieve size is recorded to the nearest 1 %. This method must he used when performing composite sieving. For cases of disputes. Method A is the referee method.
1.6.2 Method B—The percentage (by mass) passing each sieve size is recorded to the nearest 0. 1 %. This method is only applicable for single sieve-set sieving and when the maximum particle size is equal to or less than the No. 4 (4.75-mm) sieve.
1.7 This test method does not cover, in any detail, procurement of the sample. It is assumed that the sample is obtained using appropriate methods and is representative.
1 .8 Sample Processmg—Three procedures (moist, air dry, and oven dry) are provided to process the sample to obtain a specimen. The procedure selected will depend on the type of sample. the maximum particle-size in the sample. the range of particle sizes, the initial conditions of the material, the plasticity of the material, the efficiency, and the need for other testing on the sample. The procedure may be specified by the requesting authority; otherwise the guidance given in Section 10 shall be followed.ASTM D6913 pdf download.