Relative Compaction from Proctor Test
Easycompactionproctor
A field compaction test gives a dry unit weight of 17.2 kN/m³. The laboratory maximum dry unit weight from a standard Proctor test is 18.5 kN/m³. The relative compaction is most nearly:
- A86%
- B93%
- C100%
- D108%
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Answer: B. 93%
Relative compaction is the ratio of field to laboratory maximum dry unit weight: R = 17.2/18.5 × 100 ≈ 93%. Most earthwork specifications require 90 to 95 percent for structural fill, so this result would typically pass.
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