Vibratory rollers respond to the need for speed: as the paving industry learns to live with Superpave, double-drum rollers deliver multiple vibrating speeds and compacting power to handle most rolling work.(Buying File: Tandem Vibratory Rollers)

Construction Equipment, October, 2004 by Stewart, Larry

Superpave asphalt pavements demand faster tandem vibratory rollers. Much of the equipment innovation has focused on increasing vibration frequency so machines can effectively compact mats while rolling faster. But some manufacturers are also expanding the choice of vibration amplitudes at various frequencies. Others have challenged the basic tenants of vibration, offering double-drum vibratory models that generate horizontal shear forces by rocking a drum forward and back instead of bouncing it up and down.

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Forty-eight states allow or require Superpave mix designs, and well over half of all scheduled hot-mix projects at the state level are now designed using the system. The change in how asphalt roads are specified...

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