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    Compaction Equipment for Asphalt Mixtures

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    The development of different types of compaction equipment over the past 30 years is briefly reviewed. Certain types of static steel wheel rollers and certain sizes of pneumatic rollers are shown to have lost ground to vibratory rollers for asphalt pavement compaction. An empirical method is presented for purposes of comparing the linear-load rating for static steel wheel rollers with the contact pressure rating of pneumatic tire rollers, with the indication that both types are capable of the same range contact pressures in practice. The dynamic effect of vibration is discussed to indicate the economic benefits of vibratory rollers providing they are properly used. The various limitations of each basic type of asphalt compaction equipment are also discussed. The inability to predict material behavior before running the roller pattern is mentioned in terms of recent developments in end result specifications, nondestructive testing, and statistical sampling control. The paper concludes that compaction problems of the past, present, and future can result not only from improper application of compactors, which is correctable with training and education, but also from inability to predict unsuitable mix behavior for compaction. This lack of predictability combined with problems of mix confinement will continue to cause compaction problems, but such problems are not compactor related.


    asphalt compactors, steel wheel rollers, pneumatic tire rollers, vibratory asphalt rollers, roller patterns

    Author Information:

    Geller, M
    Vice-president marketing, DYNAPAC MFG, Inc., Stanhope, N. J.

    Committee/Subcommittee: D04.40

    DOI: 10.1520/STP32499S