ROLE OF UNBOUND AGGREGATES - PAST, PRESENT AND FUTURE

In an effort to determine what can (and cannot) be done in the future relative to pavement construction and to suggest how present concern for energy convervation can be accommodated by those interested in the use of aggregates for flexible pavements, the historical implications of flexible pavements are examined, the ways in which future flexible pavements will differ from the past are discussed, and the new concepts and needs that must be satisfied are are set forth. History indicates that flexible pavements require aggregates, that the need for new and reconstructed pavements will persist, that designs based solely on "lowest annual cost" will be inadequate, and that the shift from affluence to shortage produces unique problems. Social and environmental objectives have influenced highway and pavement design, and "efficiency" of highway services will be increasingly required to reflect the quality of the social system. New analytical techniques and new criteria will be needed. A change in the economics will be prompted by the continuing need for construction materials. The new analyses will consider social variables which will depend upon the relative significance of the impact and the political importance of the variable (e.g. energy). Problems will arise when annual costs of alternative design are different as well as the social impacts. The presently used techniques will need to be greatly improved or made more extensive. These techniques must become increasingly more reliable; the measurement of performance and the means of obtaining consistent results will need to be standardized.

  • Supplemental Notes:
    • Proceedings from a conference on Utilization of Graded Aggregate Base Materials in Flexible Pavements, March 25-26, 1974, Oak Brook Hyatt House, Oak Brook, Illinois.
  • Corporate Authors:

    National Crushed Stone Association

    1415 Elliot Place, NW
    Washington, DC  USA  20007

    National Sand and Gravel Association

    900 Spring Street
    Silver Spring, MD  USA  20910

    National Slag Association

    300 South Washington Street
    Alexandria, VA  USA  22314
  • Authors:
    • Baker, R F
  • Publication Date: 1974

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Filing Info

  • Accession Number: 00127526
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 7 1976 12:00AM