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Alternative Title:Typical moisture : density curves : Louisiana highway research.
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Abstract:One of the many problems associated with compaction control on any construction project is the time consuming task of obtaining maximum density and optimum moisture content of soils both in the laboratory and in the field. In addition to the time element, there seems to be a relatively large operator variance in performing this particular aspect of materials control.
In order to eliminate most of the time consuming work and to obtain results which are somewhat more uniform in character, the Soils Research Unit of the Louisiana Department of Highways undertook the task of developing a family of curves from which maximum density and optimum moisture content could be obtained by determining only one point on a curve for a given soil.
The primary family of curves was developed and submitted to the field in February, 1963. This curve was developed by plotting approximately 1,000 moisture-density curves taken from the files.
A supplemental family of curves designed to cover those materials which would not fit the original family was developed in the same general manner. However, two basic causes have deterred checking the accuracy of the family for these materials, namely: (1) comparatively few of these curves are encountered and (2) there is a transition zone where it is extremely difficult to classify the material so as to decide which family to use.
The soils which fit into this supplemental category are generally somewhat granular in nature, however, there appears to be no practicable field method of distinguishing the materials in this category by soil type from those which fit the main family of curves.
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