ASTM D6913 PDF

A number in parentheses indicates the year of last reapproval. The test is more complicated and complex than would be expected. Multiple procedures are being presented along with new terminology. Some examples of these new terms are composite sieving, designated separating sieve and subspecimen. This test method outlines the majority of conditions and procedures but does not cover every conceivable variation or contingency.

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Significance and Use 5. For example, highway embankments, backfills, and earthen dams may have gradation requirements. Hydraulic conductivity, compressibility, and shear strength are related to the gradation of the soil.

However, engineering behavior is dependent upon many factors such as effective stress, stress history, mineral type, structure, plasticity, and geologic origins and cannot be based solely upon gradation. Users of these test methods are cautioned that compliance with Practice D does not in itself assure reliable results. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Scope 1. 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. Furthermore, if the maximum particle size is greater than 4. Finally, if the maximum particle size is equal to or greater than For special conditions see 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.

This method must be used when performing composite sieving. For cases of disputes, Method A is the referee method. This method is only applicable for single sieve-set sieving and when the maximum particle size is equal to or less than the No. It is assumed that the sample is obtained using appropriate methods and is representative.

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.

Such extraneous matter can affect the washing and sieving procedures. Typical examples of these soils are some residual soils, most weathered shales and some weakly cemented soils such as hardpan, caliche or coquina. Depending on the design considerations, a specialized gradation-testing program could be performed.

The alterations could require the washing and sieving procedures to be standardized such that each specimen would be processed in a similar manner. However, the applicable sections above should be used in applying this standard. In addition, they are representative of the significant digits that generally should be retained. It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering design.

Only the SI units are used for mass determinations, calculations, and reported results. However, the use of balances or scales recording pounds of mass lbm shall not be regarded as nonconformance with this standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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ASTM D6913

Significance and Use 5. For example, highway embankments, backfills, and earthen dams may have gradation requirements. Hydraulic conductivity, compressibility, and shear strength are related to the gradation of the soil. However, engineering behavior is dependent upon many factors such as effective stress, stress history, mineral type, structure, plasticity, and geologic origins and cannot be based solely upon gradation.

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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. Furthermore, if the maximum particle size is greater than 4. Finally, if the maximum particle size is equal to or greater than

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