AGGREGATE DEGRADATION IN BITUMINOUS MIXTURES

A LABORATORY STUDY WAS PERFORMED USING A GYRATORY TESTING MACHINE TO DETERMINE THE FACTORS AFFECTING THE DEGRADATION OF AGGREGATE IN BITUMINOUS MIXTURES. THREE KINDS OF AGGREGATES WITH DIFFERENT LOS ANGELES VALUES WERE USED. THE AGGREGATES WERE BLENDED ACCORDING TO THREE DIFFERENT GRADATIONS RANGING FROM AN OPEN GRADATION TO A FULLER MAXIMUM DENSITY GRADATION. FOUR DIFFERENT ASPHALT CONTENTS WERE USED. THE RESULTS OF THE STUDY INDICATED THAT EACH FRACTION OF AGGREGATE DEGRADED IN SUCH A WAY THAT ITS SIEVE ANALYSIS CURVE WAS A SMOOTH CURVE APPROACHING A PARABOLA, WHICH IMPLIED THAT THE PATTERN OF DEGRADATION IS CONSTANT. THE MAGNITUDE OF DEGRADATION, AS MEASURED BY PERCENT INCREASE IN SURFACE AREA, WAS FOUND TO VARY AND TO DEPEND ON THE FOREGOING VARIABLES. GRADATION WAS FOUND TO BE THE MOST IMPORTANT FACTOR AFFECTING DEGRADATION, THE DENSER THE MIX THE LESSER THE DEGRADATION. DEGRADATION ALSO VARIED WITH TYPE OF AGGREGATE. IN GENERAL, AGGREGATES WITH HIGH LOS ANGELES VALUES RESULTED IN MORE DEGRADATION THAN THOSE WITH LOW LOS ANGELES VALUES.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1963/24/24-005.pdf
• Supplemental Notes:
  • 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:
  • Moavenzadeh, F
  • Goetz, W H
• Publication Date: 1963

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: No 24, pp 106-137, 22 FIG, 12 TAB, 40 REF
• Monograph Title: Bituminous materials and mixtures
• Serial:
  • Highway Research Record
  • Issue Number: 24
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregate gradation; Aggregates; Asphalt content; Bituminous mixtures; Blending; Compaction; Density; Grading (Earthwork); Gyratory testing machines; Laboratory studies; Measurement; Parabolas; Sieve analysis; Standardization
• Old TRIS Terms: Aggregate blending; Degradation (Aggregate); Gyratory tests; Los angeles value; Maximum density /gradation/
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00210261
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jul 1 1994 12:00AM