TRIAXIAL SHEAR STRENGTH CHARACTERISTICS OF SOME SAND-ASPHALT MIXTURES

THIS INVESTIGATION, WHICH AROSE FROM A CONSIDERED NEED FOR MORE WORK OF A FUNDAMENTAL NATURE IN ASPHALT STABILIZATION, DETERMINED STRENGTH RELATIONSHIPS OF CUTBACK ASPHALT, EMULSIFIED ASPHALT, ASPHALT, HOT-MIX AND FOAMED ASPHALT MIXTURES BY TRIAXIAL COMPRESSION TESTING OF CURED AND WATER- IMMERSED SPECIMENS. THE RESULTS SHOW THAT FOR THE FINE, UNIFORM AND ROUNDED QUARTZ SANDS USED /99 PERCENT PASSING NO. 40 SIEVE WITH A UNIFORMITY COEFFICIENT OF APPROXIMATELY 2.00/, THE FOAMED ASPHALT PROCESS RESULTS IN SUPERIOR SHEAR STRENGTHS OF CURED SPECIMENS, COMPARED TO THE OTHER PROCESSES. HOWEVER, IMMERSION CAUSES A CONSIDERABLE LOSS IN COHESION RESULTING IN STRENGTHS SIMILAR TO THOSE OF IMMERSED CUTBACK OR EMULSIFIED ASPHALT SPECIMENS, ALTHOUGH ALTERNATE CYCLES OF CURING AND IMMERSION DO NOT SIGNIFICANTLY AFFECT THE FINAL CURED SHEAR STRENGTHS OF FOAMED ASPHALT SPECIMENS. IT IS ALSO SHOWN THAT AT THE SAME ESTIMATED BITUMINOUS FILM THICKNESS, THE ADDITION OF A LIMITED AMOUNT OF FINES PASSING A NO. 50 SIEVE SIZE RESULTS IN INCREASED CURED COHESIVE STRENGTHS. IT IS POSTULATED THAT THE HIGHER STRENGTHS OF THE CURED FOAMED ASPHALT MIXTURES ARE DUE PRIMARILY TO APPARENT COHESION RESULTING FROM SURFACE TENSION FORCES IN THE WATER PHASE, THE MAGNITUDE OF WHICH IS RELATED TO THE UNIFORMITY AND THICKNESS OF ASPHALT FILMS COATING INDIVIDUAL SAND PARTICLES. /AUTHOR/

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 1-12
  • Monograph Title: Road Crown, Testing, Compaction, Soil Bitumen; The Alaska Earthquake
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00230528
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:40AM