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Section 5: Cleaning the Pavement

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The pavement should be cleaned and swept prior to, but not too far in advance of, the asphalt application. Cleaning should include removal of any vegetation and soil on the edge of the pavement. Sweeping is especially important under dusty conditions.

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Safety During Sweeping Operations

Since the sweeper operates a considerable distance ahead of the other seal coat equipment, it is very critical that the sweeper is equipped with appropriate warning devices. Motorists do not always stay on the proper side of the traffic cones, or they may enter the roadway from a private drive or side road. The sweeper may sometimes create so much dust that visibility is reduced. When visibility is reduced, a flagger may be required.

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Sweeping Pattern

Normally the sweeper will require two to three passes to adequately prepare a 12-foot lane. It is preferable that each pass progresses toward the shoulder. Certain wind conditions or other unique situations could require a different pattern; however, it is always best to broom away from traffic and with the wind whenever possible.

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Sweeping Distance from Operation

The sweeping operation should be far enough ahead that the sealing operation is never held up waiting for the sweeper. If conditions are very dusty, sweeping should not be more than one or two shots ahead of the asphalt distributor to prevent dust accumulation between the sweeper and the asphalt distributor. Additional sweeping may be required where dust or dirt is tracked onto the pavement from side roads or private access roads. Hand work may be required.

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