ASTM D4643 PDF

More D The use of Test Method D for water content determination can be time consuming and there are occasions when a more expedient method is desirable. The use of a microwave oven is one such method. While not eliminating this possibility, the incremental drying procedure described in this test method will minimize its effects. Some microwave ovens have settings at less than full power, which can also be used to reduce overheating. Therefore, the procedure recommended in this test method is meant to serve as a guide when using the microwave oven.

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Moogubei The quality of the results produced by this test method is dependent on the competence of the personnel performing it and the suitability of the equipment and facilities used. Link to Active This link will always route to the current Active version of the standard.

Degregation of individual particles may occur, along with vaporization or chemical transition. Test Method D is to be used as the method to compare for accuracy checks and correction.

This test method is best suited for minus 4 sized material. The sstm of a microwave oven is one such method.

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. Larger size particles can be tested; however, care must be taken because of the increased chance of particle shattering. Referenced Documents purchase separately The documents listed below are referenced within the asfm standard but are not provided as ashm of the standard.

In addition, they are representative of the significant digits that generally should be retained. The use of Test Method D for water content determination can be time consuming and there are occasions when a more expedient method is desirable. This occurs since 1 plus the water content not in percent will have four significant digits regardless of what the value of the water content is; that is, 1 plus 0. Active view current version of standard.

For some soils, such as those containing significant amounts of halloysite, mica, montmorillonite, gypsum or other hydrated materials, highly organic soils, or soils in which the pore water contains dissolved solids such as salt in the case of marine depositsthis test method may not yield reliable water content values.

While not eliminating this possibility, the incremental drying procedure described in this test method will minimize its effects. Soil testing Lab Services: This method may not be appropriate when highly accurate results are required.

Larger size particles can be tested; however, care must be taken because of the ashm chance of particle shattering. Historical Version s — view previous versions of standard. Note 1-Notwithstanding statements of precision and bias contained in this standard, the precision of this test method is dependent on the competence of the personnel performing it and the suitability of the equipment and facilities used. The principal objection to the use of the microwave oven for water content determination has been the possibility of overheating the soil d obtaining erroneous results.

This procedure is repeated until the mass becomes nearly constant. For example, if four significant digits are required in any of the above calculations, then the water content has to be recorded to the nearest 0.

ASTM D 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. No other units of measurement are included in this test method.

Soil testing Back to Results Print. Referenced Documents purchase separately The documents listed below are referenced asgm the subject standard but are not provided as part of the standard.

The behavior of a soil, when subjected to microwave energy, is dependent on its mineralogical compositions, and as a result no one procedure is applicable for all types of soil. It is therefore recommended that samples used in this test method not be used for other tests subsequent to drying. Users of this test method are cautioned that compliance with Practice D does not in itself ensure reliable results. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Some microwave ovens have settings at less than full power, which can also be used to reduce overheating. Users of this test method are cautioned that compliance with Practice D does not in itself ensure reliable testing. Reliable results depend on many factors; Practice Asgm provides a means of evaluating some of those factors.

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More D Scope 1. For some soils, such as those containing significant amounts of halloysite, mica, montmorillonite, gypsum or other hydrated materials, highly organic soils, or soils in which the pore water contains dissolved solids such as salt in the case of marine deposits , this test method may not yield reliable water content values. No other units of measurement are included in this test method. This is especially important if the water content will be used to calculate other relationships such as moist mass to dry mass or vice versa, wet unit weight to dry unit weight or vice versa, and total density to dry density or vice versa. For example, if four significant digits are required in any of the above calculations, then the water content has to be recorded to the nearest 0. This occurs since 1 plus the water content not in percent will have four significant digits regardless of what the value of the water content is; that is, 1 plus 0.

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