What is the optimum moisture content (OMC) range for compacting cohesive soils, as per IS 2720 (Part 8) - 1983?
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A.
10–14%
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B.
12–16%
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C.
8–12%
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D.
15–20%
Correct Answer:
B. 12–16%
Explanation:
The correct answer is 12–16%.
According to IS 2720 (Part 8) - 1983, which details the heavy compaction test (often referred to as the Modified Proctor Test), the optimum moisture content (OMC) for cohesive soils generally falls between 12% and 16%. This specific range is critical for achieving maximum dry density during construction projects like embankments or dam cores. While moisture levels can vary based on the specific clay mineralogy and soil plasticity, this standard provides the technical benchmark for ensuring structural stability and reducing future settlement in compacted cohesive earthworks.
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