Standard Test Method for Determination of Water Content of Soil By Direct Heating (ASTM D4959 - 16) define as The water content of a soil is used throughout geotechnical engineering practice both in the laboratory and in the field. The use of Test Methods D2216 for water content determination can be time consuming and there are occasions when a more expedient method is desirable. Drying by direct heating is one such method. Results of this test method have been demonstrated to be of satisfactory accuracy for use in field control work, such as in the determination of water content, and in the determination of in-place dry unit weight of soils.
Standard Test Method for Determination of Water Content of Soil By ASSHTO (ND T 265 - LABORATORY DETERMINATION OF MOISTURE CONTENT OF SOILS) is the same way.
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