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Pneumatic-Tired Rollers
Rolling Techniques

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure 11-44.-Steel-wheeled roller. Figure 11-45.—Drive wheel rolling action. Pneumatic-tired rollers may be equipped with 15-, 17-, 20-, or 24-inch tires. Air pressure in the tires may vary for different types of material, such as 50 to 60 psi to finish asphalt and 100 psi to compact a granular subbase. The tires must be inflated to nearly equal pressure with variation not exceeding 5 psi to apply uniform  pressure  during  rolling. coarse materials and asphalt. This roller produces a smooth,  solid  surface  under  favorable  conditions,  but may fail to compact areas narrower than the roll, and do not  compact  deeply  in  proportion  to  their  weight.  The steel- wheeled roller does not change shape to bring suitable support for itself. Rather it sinks until enough bearing area has come in contact with the roll to support Figure 11-43 shows the action of a pneumatic-tired the roller weight. roller. Pneumatic-tired rollers are used because the The drive wheel is ahead of the tiller wheel in the individual wheels can exert a kneading action in small direction of travel. The tiller wheel functions as the areas that wide, rigid steel drums tend to bridge. steering  axle.  As  shown  in  figure  11-45,  there  is  a STEEL-WHEELED  ROLLERS A steel-wheeled roller, as shown in figure  11-44, is used  for  compaction  and  finish  operations  on  base downward vertical force caused by the weight or the wheel. The arrows, concentric with the steel wheel, represent the rotational force on the wheel. This force is transmitted to the base of the wheel, as the roller is 11-23







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