A tabulated summary is presented of the results of a questionnaire survey which was conducted to evaluate the extent and seriousness of the problem of aggregate degradation in highway construction in the U.S. and Canada. The results of the survey are analyzed and the interrelationships between these questions are considered. It was determined that certain conclusions may be drawn regarding the relationship between such factors as (1) the type of aggregate and the seriousness of degradation (2) the various combinations of quality control tests utilized and the degree of protection provided against acceptance of poor quality material. It is concluded from the findings that when comparing physical degradation versus chemical, the physical degradation problem is the more troublesome. The relative seriousness of the various forms of degradation is influenced by the type of aggregate. Sixty-two percent of those states reporting problems with volcanic aggregate attributed difficulties to both chemical and physical degradation. Replies also indicated that uncoated aggregate is the major problem in respect to degradation. Data indicates that an abrasion test should be combined with either a soundness or wet abrasion if confidence in the testing program is to be achieved. Aggregate users indicate that the greatest need is in the area of methods of aggregate evaluation and secondly in assessing the severity of a particular use.

  • Corporate Authors:

    Transportation Research Board

    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Authors:
    • Hendrickson, L G
    • Shumway, R D
  • Publication Date: 1973-7

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00272049
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 5 1974 12:00AM