CHARACTERISTICS OF GRADED AGGREGATES AS RELATED TO THEIR BEHAVIOR UNDER VARYING LOADS AND ENVIRONMENTS

This presentation which focuses upon the characteristics of plant processed graded aggregates and the responses of such materials under static and repetitive loading as well as their responses to freezing conditions, discusses typical data which illustrate that graded aggregates can be used with confidence and reliability when such materials are incorporated into a well designed pavement. The necessary and desirable characteristics can be assured through good specifications without performing elaborate and sophisticated testing, though such tests are required when and if a dispute over the suitability of a given material arises. A figure is used to illustrate the latest revision of ASTM D 2940 gradation specification; graded aggregates meeting the requirements as stated in this specification will possess the characteristics necessary to withstand static and repetitive loading under a variety of environmental conditions. Strain control triaxial testing, elastic response and plastic responses under repetitive loading, and responses to freezing environment are discussed. It is pointed out that graded aggregates can be uniformly produced and supplied. Such aggregates do not fatigue after a large number of load applications; they become more rigid with use and resist permanent deformations; they are not adversely affected by high summer temperatures; they do not contribute to excessive resilient deformations that cause fatigue cracking of the surfacing (therefore fully compatible with bituminous surfacing); they are ideally suited to stage construction-they can be used in pavements with minimum surfacing thickness to help ease the energy shortage; detrimental frost heaving effects can be minimized by replacing unsuitable soils with graded aggregates; they can be used for cement or bituminous stabilized bases with less cemetitious agent than other unprocessed mixtures; and potential improvements of stability, rigidity and durability are dependent on many factors e.g. compaction, max size etc.

  • 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:
    • Kalcheff IV
  • Publication Date: 1974

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Filing Info

  • Accession Number: 00127533
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 7 1976 12:00AM