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Since the summer of 1935, the Ohio Department of Highways has been using a specification for the control of the moisture and compaction of soils in the construction of soil embankments. This specification, with some modifications and improvements, has been used successfully for more than 22 years. It is based on the fact that each soil type, when subjected to a given compactive effort, has a moisture content at which maximum density can be obtained. This optimum moisture content, and the maximum density test used by the Ohio Department of Highways is the “ASTM Tentative Methods of Test for Moisture-Density Relations of Soils” D 698 — 57 T. This paper deals with the development and use of Ohio's typical moisture-density curves.
Assistant Engineer, Ohio State Highway Testing Laboratory, Columbus, Ohio