MODIFICATION OF THE STANDARD LOS ANGELES ABRASION TEST

THE PRESENT LOS ANGELES ABRASION TEST, COMMONLY REFERRED TO AS THE LOS ANGELES RATTLER OR LAR TEST, IS SATISFACTORY FOR DETERMINING THE RESISTANCE OF AN AGGREGATE TO DRY ABRASION. HOWEVER, SOME STATE HIGHWAY DEPARTMENTS HAVE HAD TO DEVELOP TESTS OF THEIR OWN FOR DETERMINING WEARABILITY OF AGGREGATES UNDER WET ABRASION CONDITIONS. A MODIFICATION IS PROPOSED TO THE STANDARD LAR TEST TO INCLUDE 250 REVOLUTIONS WITH THE AGGREGATE IN THE DRY STATE PLUS 250 REVOLUTIONS AFTER A FIXED AMOUNT OF WATER HAS BEEN ADDED. A SEDIMENTATION ANALYSIS IS THEN RUN ON THE ENTIRE SAMPLE. IF THE SAMPLE PASSES THE SEDIMENTATION ANALYSIS WITHIN SPECIFIED LIMITS, IT IS THEN OVEN- DRIED AND PLACED IN A SIEVE SHAKER. THE PERCENT LOSS THROUGH A NO. 16 SIEVE IS THEN DETERMINED. RESULTS OBTAINED FROM THE TESTING OF NUMEROUS SAMPLES, WHEN COMPARED WITH THE WASHINGTON DEGRADATION TEST, THE STANDARD LAR TEST, AND PETROPGRPHIC ANALYSIS, INDICATE THAT THE PROPOSED MODIFICATION OF THE STANDARD LAR TEST HAS CONSIDERABLE MERIT. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1971/353/353-002.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309019664
• Supplemental Notes:
  • Sponsored by Committee on Mineral Aggregates and presented at the 50th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Larson, Lorys J
  • Mathiowetz, Reinhold P
  • Smith, Joe H
• Publication Date: 1971

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 15-24
• Monograph Title: Mineral aggregates
• Serial:
  • Highway Research Record
  • Issue Number: 353
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregates; Materials tests; Petrography
• Identifier Terms: Los Angeles Abrasion Test
• Uncontrolled Terms: Aggregate testing; Change
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00217890
• Record Type: Publication
• ISBN: 0309019664
• Files: TRIS, TRB
• Created Date: Jan 12 1972 12:00AM