ASM D 422 Cancelado - Revision Granulometria

Please download to get full document.

View again

of 5
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Information Report
Category:

Documents

Published:

Views: 2 | Pages: 5

Extension: DOCX | Download: 0

Share
Related documents
Description
ASM D 422 Cancelado - Revision Granulometria
Tags
Transcript
    Withdrawn Rationale: This test method covers the quantitative determination of the distribution of particle sizes in soils. The distribution of particle sizes larger than 75 μ m (retained on the No. 200 sieve) is determined by sieving, while the distribution of particle sizes smaller than 75 μ m is determined by a sedimentation process, using a hydrometer to secure the necessary data. Formerly under the jurisdiction of Committee D18 on Soil and Rock, this test method was withdrawn in January 2016 in accordance with section 10.6.3 of the Regulations Governing ASTM Technical Committees , which requires that standards shall be updated by the end of the eighth year since the last approval date. 1. Scope 1.1 This test method covers the quantitative determination of the distribution of particle sizes in soils. The distribution of particle sizes larger than 75 μ m (retained on the No. 200 sieve) is determined by sieving, while the distribution of particle sizes smaller than 75 μ m is determined by a sedimentation process, using a hydrometer to secure the necessary data (Note 1 and Note 2). NOTE 1: Separation may be made on the No. 4 (4.75-mm), No. 40 (425- μ m), or No. 200 (75- μ m) sieve instead of the No. 10. For whatever sieve used, the size shall be indicated in the report.  NOTE 2: Two types of dispersion devices are provided: ( 1 ) a high-speed mechanical stirrer, and ( 2  ) air dispersion. Extensive investigations indicate that air-dispersion devices produce a more positive dispersion of plastic soils below the 20- μ m size and appreciably less degradation on all sizes when used with sandy soils. Because of the definite advantages favoring air dispersion, its use is recommended. The results from the two types of devices differ in magnitude, depending upon soil type, leading to marked differences in particle size distribution, especially for sizes finer than 20 μ m. 1. Scope 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-m) 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 be used. 1.4 In cases where the gradation of particles smaller than No. 200 (75-m) sieve is required, Test Method D 422 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 (3/ 8-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-in sieve), composite sieving is applicable. For special conditions see. 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 AThe percentage (by mass) passing each sieve size is recorded to the nearest 1 %. This method must be used when performing composite sieving. For cases of disputes, Method A is the referee method. 1.6.2 Method BThe 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 ProcessingThree 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 shall be followed. 1.9 This test method typically requires two or three days to complete, depending on the type and size of the sample and soil type. 1.10 This test method is not applicable for the following soils: 1.10.1 Soils containing fibrous peat that will change in particle size during the drying, washing, or sieving procedure. 1.10.2 Soils containing extraneous matter, such as organic solvents, oil, asphalt, wood fragments, or similar items. Such extraneous matter can affect the washing and sieving procedures. 1.10.3 Materials that contain cementitious components, such as cement, fly ash, lime, or other stabilization admixtures. 1.11 This test method may not produce consistent test results within and between laboratories for the following soils and the precision statement does not apply to them. 1.11.1 Friable soils in which the sieving processes change the gradation of the soil. Typical examples of these soils are some residual soils, most weathered shales and some weakly cemented soils such as hardpan, caliche or coquina. 1.11.2 Soils that will not readily disperse such as glauconitic clays or some dried plastic clays. 1.11.3 To test these soils, this test method must be adapted, or altered, and these alterations documented. 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. 1.12 Some materials that are not soils, but are made up of particles may be tested using this method. However, the applicable sections above should be used in applying this standard.
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks