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.

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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.

Therefore, numbered subsections will not be continuous in some cases, as indicated in the Scope section. 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 open- ing sieve criterion in determining the gradation of soil between the 3-in.

Current edition approved Feb. Published September Finally, if the maximum particle size is equal to or greater than For special conditions see This method must be used when performing composite sieving. For cases of dis- putes, 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.

Such extraneous matter can affect the washing and sieving proce- dures. 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. Only the SI units are used for mass determina- tions, 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.

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ASTM D6913

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.

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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.

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