Rollers

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What 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.

Once 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:

Articulated 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 mat.

 

 

ASPHALT ROLLERS

I. 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.

II. Rollers are manufactured in two styles:

A. Static rollers.

B. Vibratory rollers.

III. 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.

IV. 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:

A. Gravity feed or drip system.

B. Pressurized spray system.

Both 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.