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You can have a relative compaction value of greater than 100%. The maximum density test gives you a density that is the maximum value under that particular compactive effort. The modified proctor will give you a higher maximum density than the standard proctor test which has a lower energy input. The modified proctor attempts to model the energy input by larger compaction equipment. However, if you had a large piece of compaction equipment and/or compacted the soil in thin lifts repeatedly you could exceed the maximum density.

Typically, if you do not have an unusual circumstance (compacting very thin lifts a large amount of times) the higher than maximum density value is the result of a change in soil type. Do a new max if you are unsure on the soil that you tested in the field.

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14y ago

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Q: Why is a relative compaction test greater than 100 percent?
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