ADHESION IN BITUMEN MACADAM

LOSS OF ADHESION BETWEEN A BITUMINOUS BINDER AND STONE IN THE PRESENCE OF WATER MAY TAKE PLACE BY THE RETRACTION OF THE BINDER. IT IS SUGGESTED THAT THIS ONLY OCCURS WHEN THE VISCOSITY OF THE BINDER IS LOW. WHEN LOSS OF COHESION OCCURS IN A CARPET IT MORE NORMALLY ORIGINATES FOR THE ACCUMULATION OF WATER AT THE BINDER-STONE INTERFACE LEADING TO A CONDITION IN WHICH THE BINDER MAY BE PEELED CLEANLY AWAY FROM THE STONE SURFACE. THIS DETACHMENT OCCURS EQUALLY WITH BITUMENS AND TARS. UNDER TRAFFIC STRESSES THIS MAY LEAD TO THE LOSS OF COHESION WHICH, ON RARE OCCASIONS, LEADS TO SURFACE DISINTEGRATION. PRETREATMENT OF THE MINERAL SURFACE WITH CERTAIN METAL SALTS MAY DELAY FOR SEVERAL MONTHS THE INITIAL STATE OF DETACHMENT, WHEREAS THIS STATE CANNOT BE PREVENTED OR DELAYED FOR MORE THAN A FEW DAYS BY THE ADDITION OF WETTING ADDITIVES TO THE BINDER. SUCH ADDITIVES, HOWEVER, MAY MODIFY THE SUBSEQUENT DEGREE OF DETACHMENT AND VERY MUCH REDUCE THE LOSS OF COHESION WHICH MAY FOLLOW UNDER THE ACTION OF TRAFFIC. LOSS OF COHESION IN THESE CIRCUMSTANCES CAN ALSO BE REDUCED BY THE PRESENCE IN THE BINDER OF COMPONENTS WHICH HAVE NO POSITIVE WETTING TENDENCY BUT CONFER A CERTAIN INTERFACIAL RIGIDITY.

  • Supplemental Notes:
    • Vol 10, Pt 11, PP 433-444
  • Authors:
    • Hughes, R I
    • Lamb, D R
    • Pordes, O
  • Publication Date: 1960-11

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Filing Info

  • Accession Number: 00211007
  • Record Type: Publication
  • Source Agency: Highway Research Board Bibliography
  • Files: TRIS
  • Created Date: Apr 28 1994 12:00AM