Comparison of Methods of Determining Moisture in Sands


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Title: Comparison of Methods of Determining Moisture in Sands

Author(s): William R. Johnson

Publication: Journal Proceedings

Volume: 25

Issue: 2

Appears on pages(s): 261-270

Keywords: none

Date: 2/1/1929

In applying the water-cement ratio method of proportioning concrete to actual job conditions there is need for a quick, accurate method of determining the moisture content in the sand. A number of methods are now being used with more or less success. The basic principle of these methods, however, vary considerably. They include drying to a constant weight, measurement of the displacement in a liquid, the change in electrical resistance due to moisture, and the change in specific gravity of a testing liquid. All of these methods are not equally satisfactory. Some of them are not accurate, others either require too many operations and take too long to complete, or require too much apparatus for greatest usefulness under field conditions. This investigation was undertaken with a view to studying the advantages and disadvantages of some of these methods.