Published: Jan 1970
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This method describes procedures for determining the moisture content of soil and soil-aggregate in place through the use of nuclear equipment. The equipment is calibrated to determine moisture content, as weight of water per unit volume of material (lb/ft 3 or g/cm3). Moisture content as normally used is defined as the ratio, expressed as a percentage, of the weight of water in a given soil mass to the weight of solid particles. It is determined with this procedure by dividing the moisture content (lb/ft3 or g/cm3) by the dry unit weight of the soil (lb/ft3 or g/cm3). Therefore, computation of moisture content using the nuclear equipment also requires the determination of the dry unit weight of the material under test. Most available nuclear equipment has provision for measuring both moisture content (lb/ft3 or g/cm3) and wet unit weight. The difference between these two measurements gives dry unit weight.
Soils Engineer, Ohio Department of Highways, Columbus, Ohio