The field density test using the sand replacement method (IS 2720 Part 28) is performed to determine the:
Choose the correct answer
Optimum moisture content of soil in field
In-situ dry density of compacted fill
Shear strength of compacted embankment
California Bearing Ratio of subgrade
Correct Answer
B. In-situ dry density of compacted fill
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Sand replacement method: excavate a small hole, measure volume using calibrated sand, weigh removed soil and find moisture content → compute in-situ dry density. Compare with laboratory OMC/MDD to assess compaction quality (typically require ≥95–98% of MDD).
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