Section 5: Cleaning the Pavement
Introduction
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.
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.
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.
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.