FDOT Earthwork Level 1 Practice Test

FM 1 T-80 refers to which Proctor?

Standard Proctor Modified Proctor Lightweight Proctor Rapid Proctor

Correct Answer:

Modified Proctor

Explanation:

The concept here is that Proctor tests come in different energy levels, which determine how densely a soil can be compacted at a given moisture content. The FM 1 T-80 designation signals a higher-energy compaction method. That higher energy is the hallmark of the Modified Proctor test, which uses a heavier hammer and greater impact to achieve a higher maximum dry density than the Standard Proctor. So FM 1 T-80 corresponds to the Modified Proctor because it represents the more energetic compaction procedure needed for soils that require more force to reach optimum density. The Standard Proctor uses lighter energy, yielding a lower maximum dry density, and the other terms listed aren’t standard FDOT test designations.

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