RISING OF BINDER TO THE SURFACE OF AN OPEN-GRADED BITUMINOUS MIX

ON THE SURFACE OF A 0/40 OPEN-GRADED BITUMINOUS MIX APPLIED IN 1963, SPOTS OF FLUID BINDER GRADUALLY APPEARED, JUST AS THOUGH PURE BITUMEN HAD BEEN POURED ON TO THE PAVEMENT. THIS ARTICLE DESCRIBES THE PHENOMENA OBSERVED, IN PARTICULAR THE APPEARANCE OF BUBBLES ON THE SURFACE OF THESE SPOTS OF BINDER UNDER THE EFFECT OF HOT SUNSHINE FOLLOWING A RAINY PERIOD. THE AUTHORS PROPOSE THE FOLLOWING EXPLANATION: COLD RAINWATER CARRIES HARMFUL FINES INTO THE OPEN-GRADED MIX AND INITIATES A STRIPPING OF THE MATERIAL AT THE BOTTOM OF THE COURSE. WHEN THE TEMPERATURE OF THE COURSE RISES, THE SATURATED VAPOUR PRESSURE OF THIS WATER, WHICH IS UNABLE TO RUN AWAY RISES INSIDE THE MIX AND FORCES THE BITUMEN TO THE SURFACE. THIS EXPLAINS THE STRIPPING OF THE MIX AND THE CONCENTRATION OF THE BINDER ON THE SURFACE. THE IRREVERSIBLE PHENOMENENON OCCURS WHENEVER RAIN ALTERNATES WITH SUNSHINE. PROPOSED IMPROVEMENTS ARE GIVEN IN THIS ARTICLE (SEEKING THE CAUSE OF THE FAILURE OF THE WATER TO RUN OFF AT THE LEVEL OF THE SURFACE, AND APPLICATION OF A GENERAL SEALING COURSE). /BLLR/

  • Authors:
    • Cartellas, E
    • Castan, M
  • Publication Date: 1968-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00211396
  • Record Type: Publication
  • Report/Paper Numbers: No 33
  • Files: TRIS
  • Created Date: Aug 11 2004 12:00AM