What compacting equipment is effective on soils with up to 50% of materials having a PI of 5 or greater?
a. Pneumatic-tired rollers
b. Vibrating compactors
c. Tamping rollers
d. Smooth-drum vibratory soil compactors
e. Pad-drum vibratory soil compactors
Answer: e. Pad-drum vibratory soil compactors
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