Optimum Moisture Content

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Graphical representations of optimum moisture content.

The optimum moisture content (OMC) is the percentage of moisture or saturation equal to the maximum density or minimum void ratio of a material under compaction. The optimum moisture content is commonly reported in net water content by weight where it is used in specifications for compacting embankments.

In the Modified Proctor/Fagerberg Test procedure, when testing Iron Ore Fines it states[1]:

The test procedure is applicable when the degree of saturation corresponding to Optimum Moisture Content (OMC) is 90% or higher.


  1. International Maritime Organisation, DSC.1/Circ.71 - Early Implementation of Draft Amendments to the IMSBC Code Related to the Carriage and Testing of Iron Ore Fines, 15 November 2013, London. (Download PDF)

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