BH GSO ASTM D2216:2023
Bahraini Standard
Current Edition
·
Approved on
05 April 2023
·
Standard Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
BH GSO ASTM D2216:2023 Files
English
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Current Edition
Reference Language
BH GSO ASTM D2216:2023 Scope
1.1 These test methods cover the laboratory determination
of the water (moisture) content by mass of soil, rock, and
similar materials where the reduction in mass by drying is due
to loss of water except as noted in 1.4, 1.5, and 1.8. For
simplicity, the word “material” shall refer to soil, rock or
aggregate whichever is most applicable.
1.2 Some disciplines, such as soil science, need to determine water content on the basis of volume. Such determinations are beyond the scope of this test method.
1.3 The water content of a material is the ratio of the mass
of water contained in the pore spaces of soil or rock material,
to the solid mass of particles, expressed as a percentage.
1.4 The term “solid material” as used in geotechnical
engineering is typically assumed to mean naturally occurring
mineral particles of soil and rock that are not readily soluble in
water. Therefore, the water content of materials containing
extraneous matter (such as cement etc.) may require special
treatment or a qualified definition of water content. In addition,
some organic materials may be decomposed by oven drying at
the standard drying temperature for this method (110 6 5°C).
Materials containing gypsum (calcium sulfate dihydrate) or
other compounds having significant amounts of hydrated
water, may present a special problem as this material slowly
dehydrates at the standard drying temperature (110 6 5°C) and
at very low relative humidity, forming a compound (such as
calcium sulfate hemihydrate) that is not normally present in
natural materials except in some desert soils. In order to reduce
the degree of dehydration of gypsum in those materials
containing gypsum or to reduce decomposition in highly/
fibrous organic soils, it may be desirable to dry the materials at
60°C or in a desiccator at room temperature. When a drying
temperature is used which is different from the standard drying
temperature as defined by this test method, the resulting water
content may be different from the standard water content
determined at the standard drying temperature of 110 6 5°C.
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