In the Standard Proctor compaction test, the maximum dry density (MDD) and optimum moisture content (OMC) are related such that:
Choose the correct answer
MDD increases continuously with water content
MDD is maximum at OMC; beyond OMC, dry density decreases
MDD is independent of water content
OMC is always 15% for all soils
Correct Answer
B. MDD is maximum at OMC; beyond OMC, dry density decreases
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As water content increases, dry density first increases (water acts as lubricant) reaching MDD at OMC, then decreases (excess water dilutes solids). MDD and OMC are inversely related among different soil types: fine clays have low MDD and high OMC; sandy soils have high MDD and low OMC. Compaction in field targets ≥ 95–100% of MDD.
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