The number of rollers, their types, and number of passes should be selected with regard to the SMA gradation, layer thickness, weather conditions, and the planned paving speed. Obviously the rollers should be in good working order, able to work at low and constant speeds.
The Minimum number of rollers to compact one layer one lane wide is two or three. Many nations’ guidelines stipulate diverse requirements for the numbers of rollers, mainly stating that one should use rollers weighing more than 9-10 tons each. If three rollers are in use, two of them should be responsible for the majority of the compaction, and one should be the finisher. Extra rollers should be added in case of
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TABLE 10.1 A Summary of the Usefulness of Equipment for SMA Placement steel pneu- Triple — matic Wheels Tire
finer Source: Based on M VA, Merkblatt fur das Verdichten von Asphalt (M VA), Ausgabe, FGSV Koln, Germany, 2005. |
problems with reaching the design layer density. Table 10.1 shows an overall summary of the usefulness of equipment for SMA placement based on German compaction guidelines M VA 2005.
