Tandem Roller. Monday , June 04th , 2018 - 15:16:26 PM
The input gear in this gear train has 13 teeth and the idler gear has 21 teeth. Considering only these gears the gear ratio between the idler and the input gear can be calculated as if the idler gear was the output gear. Therefore the gear ratio
Road rollers use the weight of the vehicle to compress the surface being rolled (static) or use mechanical advantage (vibrating). Initial compaction of the substrate on a road project is done using a padfoot drum roller which achieves higher compaction density due to the pads having less surface area. On large freeways a four wheel compactor with padfoot drum and a blade such as a Caterpillar 815/825 series machine would be used due to its high weight speed and the powerful pushing force to spread bulk material. On regional roads a smaller single padfoot drum machine may be used.
The final wear course of asphalt concrete (a.k.a. asphalt or blacktop in North America or macadam in England) is laid using a paver and compacted using a tandem smooth drum roller a three-point roller or a pneumatic tyre roller. Three point rollers on asphalt were very common once and are still used but tandem vibrating rollers are the usual choice now with the pneumatic tyre roller s kneading action being the last roller to seal off the surface.
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