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/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 15-24
  • Monograph Title: Mineral aggregates
  • Serial:

Subject/Index Terms

Filing Info

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