These rollers consist of large, smooth steel drums that use a combination of impact, vibration and static pressure to compact materials such as sand, ballast and gravel. They are the most ...

New to the U.S. market is Hamm's HD 9 VV tandem roller, which features a clear-sided drum and an improved hood design for ...

They’re also huge and unwieldy. In contrast, air drums can be altogether more compact, if lacking the same impact as the real thing. In any case, students [Ang], [Devin] and [Kaiyuan] decided to ...