Tandem Roller. Monday , June 04th , 2018 - 15:13:06 PM
The third gear in the picture has 42 teeth. The gear ratio between the idler and third gear is thus 42/21 or 2:1 and hence the final gear ratio is 1.62x2≈3.23. For every 3.23 revolutions of the smallest gear the largest gear turns one revolution or for every one revolution of the smallest gear the largest gear turns 0.31 (1/3.23) revolution a total reduction of about 1:3.23 (Gear Reduction Ratio (GRR) = 1/Gear Ratio (GR)).
The next course (road base) would be compacted using a smooth single drum smooth tandem roller or pneumatic tyre roller in combination with a grader and a water truck to achieve the desired flat surface with the right moisture content for optimum compaction. Once the road base is compacted the smooth single drum compactor is no longer used on the road surface (There is however an exception if the single drum has special flat-wide-base tyres on the machine).
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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