RESEARCH ON BITUMINOUS CONCRETE PROPERTIES WITH LARGE-SIZED AGGREGATES OF DIFFERENT PARTICLE SHAPE

A TEST METHOD WAS DEVELOPED TO EVALUATE BITUMINOUS MIXTURES WITH LARGE-SIZED AGGREGATES. THE TRIAXIAL METHOD OF TEST USED BY THE TEXAS HIGHWAY DEPARTMENT FOR SOIL- AGGREGATE COMBINATIONS, AS WELL AS FOR DENSE-GRADED AGGREGATES, WAS ADOPTED WITH SOME MODIFICATION. THE BASIC CHANGE WAS CLOSE CONTROL OF TEMPERATURE DURING MIXING, COMPACTION, AND TESTING. CONCLUSIONS OF THE RESEARCH INTO THE MERITS OF DIFFERENT AGGREGATES IN HOT-MIXED, HOT-LAID ASPHALTIC CONCRETE ARE: (1) A SMALL VARIATION IN THE ASPHALT CONTENT OF MIXTURES WITH LARGE-SIZED CRUSHED STONE AGGREGATE DOES NOT DETRIMENTALLY AFFECT THE STRENGTH, (2) EQUALLLY STABLE MIXES WITH LESS ASPHALT CAN BE PREPARED AS THE AGGREGATE SIZE IS INCREASED, (3) CRUSHED STONE ASPHALTIC CONCRETE MIXTURES, WHEN TESTED AT 140 F AND LOWER LATERAL PRESSURES, ARE ALMOST TWICE AS STRONG AS THOSE PREPARED WITH NATURAL MATERIALS, BUT THE DIFFERENCE IS NOT AS GREAT AT HIGHER CONFINING PRESSURES OR LOWER TEMPERATURES, (4) ALTHOUGH TESTING AT 140 F MAY NOT BE JUSTIFIED FOR BASE COURSE MIXES, TESTS AT SOME INTERMEDIATE TEMPERATURE, SUCH AS 100 TO 110 F, SHOULD PROVIDE AN INDICATION OF THE BENEFICIAL EFFECT OF THE CRUSHED STONE AGGREGATES, AND (5) ANGULAR AGGREGATES CONTRIBUTE TO THE STRENGTH PROPERTIES OF ASPHALTIC CONCRETE EITHER IN THE COARSE OR FINE PORTION OF THE MIX. THE BEST RESULTS WERE ACHIEVED WITH CRUSHED AGGREGATE THROUGHOUT THE MIX.

• Record URL:
  • https://onlinepubs.trb.org/Onlinepubs/sr/sr109/sr109-006.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:
  • Kalcheff, I V
• Conference:
  • 47th Annual Meeting of the Highway Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1968-1-15 to 1968-1-19
• Publication Date: 1970

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 27-32
• Monograph Title: EFFECTS OF AGGREGATE SIZE, SHAPE, AND SURFACE TEXTURE ON PROPERTIES OF BITUMINOUS MIXTURES
• Serial:
  • Highway Research Board Special Report
  • Issue Number: 109
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregates by shape and surface texture; Asphalt concrete; Asphalt content; Bituminous mixtures; Coarse aggregates; Crushed aggregates; Dense graded aggregates; Grain size (Geology); Hot mix asphalt; Mixing; Temperature control (Structures); Test procedures; Triaxial shear tests
• Uncontrolled Terms: Aggregate shape
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213682
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: Jul 21 1970 12:00AM