Several recent studies have indicated that significant aggregate shortages can occur in about one-third of the states. One important factor contributing to this shortage is that the current aggregate specifications in some states generally tend to disqualify some marginal aggregates that could otherwise give satisfactory service under certain conditions. The research reported in this paper was undertaken to assist in alleviating the aggregate shortage and broaden the base of aggregate supply by selecting suitable aggregate evaluation methods. The research was conducted in two phases, each of which studied a different aspect of the problem. Phase I was concerned with the overall aggregate evaluation procedures that are used in various states. Phase II dealt with the evaluation of the laboratory tests and petrographic examinations that are used to determine whether aggregates meet specifications. A literature review and a survey of current state practices resulted in the identification of four alternative schemes that are used in the states for evaluating the quality and performance of aggregates. The schemes mainly differ in the relative emphasis put on the aggregate tests, asphalt mix tests, service experience, and the prequalification of aggregate sources based on certain aspects. The relative usefulness of the four schemes was evaluated by means of the utility decision analysis. It is also noted that there is a need to consider other factors such as aggregate reserves, production costs, haul distances, environmental factors, and energy use in addition to the evaluation of quality of an aggregate.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 34-42
  • Monograph Title: Mineral aggregates
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00450249
  • Record Type: Publication
  • ISBN: 0309037735
  • Report/Paper Numbers: HS-038 693
  • Files: TRIS, TRB
  • Created Date: Feb 28 1986 12:00AM