ASTM D2216-19 PDF Download

The ASTM D2216-19 standard provides guidelines for determining the water content of soil, rock, and similar materials. The water content is an important property for understanding the behavior of these materials and their phase relationships with air and solids.

The standard specifies that the water content is determined by measuring the mass of water contained in the pore spaces of the material relative to the solid mass of particles, expressed as a percentage. The test methods described in the standard involve drying the material in an oven and measuring the reduction in mass due to the loss of water.

Special considerations are provided for materials that contain extraneous matter or compounds with significant amounts of hydrated water, such as gypsum. In these cases, special treatment or alternative drying temperatures may be necessary to obtain accurate results.

Two test methods (Method A and Method B) are provided, which differ in the significant digits reported and the size of the specimen required. Method A is recommended as the referee method for cases of dispute.

The standard emphasizes the importance of competent personnel, suitable equipment, and facilities for obtaining reliable results. Compliance with the relevant practice standards (such as Practice D3740) is necessary but not sufficient to ensure reliable results.

In addition, the standard provides information on units of measurement, rounding guidelines, and considerations for contaminated soils that may pose health and safety hazards during drying.