Investigation of Coarse Aggregate Strength for Use in Stone Matrix Asphalt

Stone Matrix Asphalt is a gap-graded hot-mix asphalt mixture composed of a coarse aggregate skeleton and a binder-rich mortar. The mixture type was first introduced to the United States in 1991, with one of the first test sections placed on I-70 near Richmond, Indiana. To help control the selection of coarse aggregate, the Indiana Department of Transportation specified a maximum Los Angeles Abrasion loss value of 30 percent. An investigation into the coarse aggregate specifications for use in Stone Matrix Asphalt was completed in this study. Emphasis was placed on evaluating various tests that may be useful is specifying coarse aggregates, and to develop a test or set of tests and specifications. Finally, the validity of the current 30 percent Los Angeles Abrasion loss value as requirement for coarse aggregate selection was determined. A survey of state agencies revealed a large variation in the Los Angeles Abrasion values currently specified. Laboratory testing revealed that the Micro-Deval test is a good compliment to the Los Angeles Abrasion test. The Micro-Deval test presents an added benefit as it includes the presence of water. Of the four tests investigated, aggregate degradation during compaction was the most accurate method for predicting coarse aggregate performance of the four tests. A combination of the Los Angeles Abrasion, Micro-Deval, and aggregate degradation tests was even more accurate in predicting coarse aggregate performance.

  • Record URL:
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284

    Indiana Department of Transportation

    100 N Senate Avenue
    Indianapolis, IN  United States  46204

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Celaya, Brandon J
    • Haddock, John E
  • Publication Date: 2006-9


  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 72p

Subject/Index Terms

Filing Info

  • Accession Number: 01104350
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/IN/JTRP-2006/4
  • Contract Numbers: SPR-2865
  • Created Date: Jul 16 2008 12:56PM