STP829

    Placement of Asphalt Concrete Mixtures

    Published: Jan 1984


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    Abstract

    A brief description of the history of the development of the asphalt paver is given in this paper. It discusses the principle of the floating screed and the operation of the paver tractor unit and screed unit. The forces that act on the screed and keep it in balance (level) to provide a smooth asphalt concrete mat are explained. Improvements in paver design and operation are detailed, and the most recent innovation of the self-widening screed is described. It is pointed out, however, that the basic operational functions of a modern paver are still the same as developed over 50 years ago. The paper also describes the causes of and cures for twelve different common problems that can occur in the asphalt concrete mat behind the paver. Emphasis is placed on why the various deficiencies have occurred and on what can be done to correct the problem when it does happen. Finally, for each mat problem area, the paper discusses the affect of each defect on the long-term performance of the asphalt concrete pavement structure.

    Keywords:

    asphalt paver, tractor unit, floating screed unit, screed balance point, ski angle, mat deficiencies, surface waves, ripples, mat tearing, texture, screed marks, screed responsiveness, auger shadows, precompaction, joints, checking, shoving, bleeding, fat spots, roller marks, asphalt concrete mix design, compaction


    Author Information:

    Scherocman, JA
    Consultant and marketing manager, Barber-Greene Company, Aurora, Ill.

    Martenson, ED
    Consultant and marketing manager, Barber-Greene Company, Aurora, Ill.


    Paper ID: STP32498S

    Committee/Subcommittee: D04.40

    DOI: 10.1520/STP32498S


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