STRENGTH AND VOLUME CHANGE CHARACTERISTICS OF BITUMINOUS MIXTURES

BITUMINOUS MIXTURES WERE COMPACTED AT DIFFERENT ASPHALT CONTENTS BY USE OF A KNEADING COMPACTOR. THE STUDY MEASURED THE EFFECT OF VARIOUS TEST DRAINAGE CONDITIONS ON THE OBSERVED STRENGTH VALUES OBTAINED BY THE OPEN SYSTEM TRIAXIAL TEST. VOLUME CHANGES DURING TESTING WERE OBSERVED AND RELATIONSHIPS BETWEEN VOID CONTENT AND STRENGTH AT VARIOUS STRENGTH CRITERIA WERE ESTABLISHED. DIFFERENCES IN DRAINAGE CONDITIONS EXISTING DURING THE PERFORMANCE OF TRIAXIAL COMPRESSION TESTS ON DENSE-GRADED BITUMINOUS MIXTURES DO NOT APPEAR TO MATERIALLY AFFECT STRENGTH VALUES. THIS CONCLUSION APPEARS JUSTIFIED FOR TIME INTERVALS BETWEEN STATIC LOAD INCREMENT APPLICATIONS OF ONE HOUR OR LESS. INDIRECT EVIDENCE INDICATES THAT A NEGATIVE PORE PRESSURE DEVELOPS IN THE GASEOUS PHASE OF A MIXTURE SUBJECTED TO TRIAXIAL COMPRESSION. THE INDICATED NEGATIVE PORE PRESSURE DID NOT AFFECT THE STRENGTH RESULTS TO ANY APPRECIABLE EXTENT, SO IT WAS CONCLUDED THAT THE EFFECT OF THIS PRESSURE WAS SO SMALL AS TO BE MASKED BY THE HIGH STRENGTH VALUES OF THE MIXTURES TESTED. ALL TEST RESULTS CLEARLY DEMONSTRATE THAT THE BITUMINOUS MIXTURE SPECIMENS TESTED CHANGED VOLUME DURING THE PROGRESS OF A TEST. THE OBSERVED VOLUME CHANGES CONSISTED OF A SLIGHT REDUCTION IN VOLUME FOLLOWED BY AN EXPANSION TO FAILURE. THERE APPEARS TO BE A UNIQUE RELATIONSHIP BETWEEN PERCENT VOIDS AND/OR VOID RATIO AND THE DEVIATOR STRESS AT A2 PERCENT AXIAL STRAIN AND AT THE PROPORTIONAL LIMIT. THE ESTABLISHED RELATIONSHIP APPARENTLY DEPENDS ON THE INITIAL CONDITIONS OF VOIDS TO WHICH THE SPECIMEN IS COMPACTED. /AUTHOR/

  • Supplemental Notes:
    • Vol 40, pp 371-405, 26 FIG, 8 TAB
  • Authors:
    • Schaub, J H
    • Goetz, W H
  • Publication Date: 1961

Media Info

  • Monograph Title: Proceedings of the Fortieth Annual Meeting of the Highway Research Board, Washington, D.C., January 9-13, 1961.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211645
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 5 1972 12:00AM