DETACHMENT OF THE STONE FROM THE BINDER UNDER THE INFLUENCE OF WATER IN ROAD SURFACE DRESSINGS

FAILURES OF BITUMINOUS SURFACE DRESSINGS AS A RESULT OF DISPLACEMENT OF THE BINDER FROM THE STONE CAN OCCUR EVEN WHEN THESE SURFACINGS HAVE BEEN LAID UNDER DRY CONDITIONS, WITH GOOD INITIAL ADHESION APPARENTLY OBTAINED, AND RAINFALL SHORTLY AFTER LAYING. DIFFUSION OF WATER THROUGH THE BINDER FILM CAN ALSO CAUSE DETACHMENT OF THE BINDER FROM THE STONE EVEN MONTHS OR YEARS AFTER THE SURFACE WAS LAID. LABORATORY AND ROAD TESTS HAVE INDICATED THAT THE DANGER OF WATER DISPLACING THE BINDER FROM THE STONE CAN BE AVOIDED OR AT LEAST REDUCED BY USING ADHESION AGENTS IN THE BINDER OR ELSE BY PRECOATING THE AGGREGATE WITH VARIOUS MATERIALS. THE FACTORS DETERMINING THE ADHESION OF BINDER TO STONE IN THE PRESENCE OF WATER ARE BRIEFLY DISCUSSED. ATTEMPTS TO CORRELATE THE CHEMICAL COMPOSITION OF THE BINDERS AND OF THE AGGREGATES WITH THEIR ADHESION BEHAVIOR HAVE SO FAR NOT BEEN CONVINCING. IT DOES APPEAR, HOWEVER, THAT THE TOTAL ACID CONTENT OF THE BITUMENS MAY BE OF IMPORTANCE. A SPECIAL DETACHMENT TEST, WHICH HAS BEEN DEVELOPED TO DETERMINE THE EFFICACY OF VARIOUS AGENTS IN PREVENTING DETACHMENT, IS DESCRIBED. THE PERFORMANCE OF ALL THE AGENTS TESTED DEPENDS ON THE TYPE OF STONE AND THE TYPE OF BINDER USED. THE EFFICACY OF THE VARIOUS COMMERCIALLY AVAILABLE CATIONIC ADHESION AGENTS VARIES CONSIDERABLY. PRE-COATING THE AGGREGATE WITH SOLUTIONS OF TAR, BITUMEN, SILICONES, AND METAL SALTS OFTEN IMPROVED ADHESION AS MUCH AS THE USE OF CATIONIC ADHESION AGENTS. PRECOATING THE STONE WITH 1 PERCENT BITUMEN OR TAR AT 250 DEG SECURED 100 PERCENT ADHESION WITH ALL TYPES OF AGGREGATE. THE HEAT STABILITY OF THE CATIONIC AGENTS WAS TESTED USING THE IMMERSION TRAY TEST. RESULTS SHOW THAT THE HEAT STABILITY OF THE AGENTS DEPENDS TO A LARGE DEGREE ON THE TYPE OF BINDER IN WHICH THEY ARE USED. DETAILS OF ROAD EXPERIMENTS ARE GIVEN, AND THE CORRELATION BETWEEN THE DETACHMENT TEST RESULTS AND ROAD PERFORMANCE INDICATES THAT THE DETACHMENT TEST MAY BECOME A USEFUL TOOL IN CHOOSING THE BEST ADHESION AGENT FOR A CERTAIN BINDER-STONE COMBINATION TO PREVENT SUBSEQUENT DISPLACEMENT OF THE BINDER FROM THE STONE AFTER LAYING IN DRY CONDITIONS.

  • Supplemental Notes:
    • Vol 50, No 481, P 1
  • Corporate Authors:

    Institute of Petroleum

    61 New Cavendish Street
    London W1M 8AR,   England 
  • Authors:
    • Karius, H
    • Dalton, G L
  • Publication Date: 1964

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00210920
  • Record Type: Publication
  • Source Agency: Highway Research Board Bibliography
  • Files: TRIS
  • Created Date: May 1 2003 12:00AM