FIELD MOISTURE CONTENT INVESTIGATION, AUGUST 1955-MARCH 1959 PHASE.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Investigations were conducted of moisture changes under flexible pavements and of the effectiveness of the Colman electrical resistance soil unit in measuring moisture content and changes in base course and subgrade beneath pavements. Data from soil moisture units installed in test items constructed with either crushed limestone or claygravel base courses placed at several moisture contents over a silty clay subgrade were compared with in-place moisture contents and meteorologi cal data. Moisture units removed from the test section on completion of testing were calibrated in the laboratory. Results indicated that placement moisture content a increased in the clay-gravel base, b remained about the same in the limestone base, and c generally increased in the subgrade, especially under base courses placed dry of optimum. Attempts to determine actual in-place moisture content with the moisture units were unsuccessful. The units are considered capable of indicating a trend in moisture content of fine-gained materials, but not of coarse-grained materials. Author