Rollers are used to compact base materials and freshly laid
asphalt. There are two basic types of roller frame designs:
A. Articulated frame rollers. They permit both rolls (like
all wheel drive) to drive and a closer steering radius to
be accomplished. While articulated rollers, with both rolls
driving, are better for maneuverability and gradeability
(able to climb hills), they tend to require more operator
skill on asphalt because if steered very sharply, or when
not moving, they will "pull" or "buckle"
the asphalt mat.
B. Straight frame rollers. They have split steering rolls
and are less disturbing to the asphalt mat.
Rollers are manufactured in two styles:
Older designs of rollers sometimes used the rear roll (as
viewed from the operator's position) to steer with. Also,
older designs of rollers utilize a chain drive on the drive
roll and "frame vibrators", whereas more modern
designs are more costly and utilize in-roll, direct connected
drive rolls and in-roll vibrators.
Water systems are necessary on rollers that are being used
to compact asphalt. The water is applied to the steel roller
surface to prevent the asphalt from sticking to the rolls
and lifting and/ or producing a scarred, pitted surface.
There are two types of water systems:
Gravity feed or drip system.
Pressurized spray system.
systems can, and usually do, use a "mat" made
of coconut husks and known as cocoa mats to break the surface
barrier and distribute the water. This causes the water
to more quickly and thoroughly be spread over the rolls.
The drip system uses more water and can clog-up faster,
while the pressurized systems prevent these problems. Water
systems include a large tank that is usually made as part
of the steel frame. These steel tanks usually present rust
problems. More modern rollers utilize a plastic tank mounted
on the frame to prevent rust problems. Water or other fluids
can sometimes be added to the rolls to gain extra weight.
do rollers do? After a paver lays asphalt
on roadways, a roller is then used to press the hot
asphalt mix, resulting a smooth, even surface. Again,
after Pavers have laid the Asphalt, Rollers are used
to compact base materials and freshly laid asphalt.
the hot asphalt has been dumped onto the paving area
by the paver, a roller presses the asphalt into the
ground, creating a smooth, even surface. There are
two basic types of roller frame designs:
frame rollers: They permit both rolls (like all wheel
drive) to drive and a closer steering radius to be
accomplished. Straight frame rollers: They have split
steering rolls and are less disturbing to the asphalt
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