Question
Download Solution PDFFor the same soil, in case of IS heavy compaction test, as compared to IS light compaction test, the optimum moisture content value will be:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
In soil mechanics, the IS light compaction test and the IS heavy compaction test are two standardized methods used to determine the compaction characteristics of soil—specifically the maximum dry density (MDD) and the optimum moisture content (OMC).
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The IS light compaction test applies a lower compactive effort, and hence more moisture is needed to lubricate the soil particles so that they can rearrange and compact effectively.
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The IS heavy compaction test applies a much higher compactive effort, which means the particles are compacted more effectively with less moisture. The higher energy input compensates for the reduced lubrication, allowing air to be expelled even at lower moisture levels.
Thus, for the same type of soil, the optimum moisture content decreases when the compaction effort increases.
Last updated on Jul 2, 2025
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