INITIAL CRACKING IN PAVEMENT CONCRETE /IN FRENCH/

THE APPEARANCE OF CRACKS IN CONCRETE IN THE FIRST FEW DAYS AFTER IT IS LAID AND BEFORE IT IS SUBJECTED TO TRAFFIC ARE EXAMINED. THIS PHENOMENON IS CAUSED BY HYGROMETRIC AND THERMAL SHRINKAGE. HYGROMETRIC SHRINKAGE QUICKLY AFFECTS THE WHOLE OF THE SURFACING, BUT CAN BE PREVENTED BY PROTECTING THE CONCRETE FROM EVAPORATION. IN THERMAL SHRINKAGE, THE INCREASE IN INTERNAL TEMPERATURE OF THE SURFACING, WHEN THE CONCRETE IS ONLY A FEW HOURS OLD, IS CAUSED BY EXOTHERMIC REACTIONS DURING SETTING. DECREASE IN INTERNAL TEMPERATURE DEPENDS ON THE INTERRUPTION OF SETTING REACTIONS AND ON ENVIRONMENTAL CONDITIONS. AIR TEMPERATURE DOES NOT APPEAR TO BE ONE OF THE MAJOR FACTORS INFLUENCING THE INTERNAL TEMPERATURE OF THE CARRIAGEWAY. IF AN ISOLATED CRACK APPEARS, ITS ORIGIN CANNOT BE ATTRIBUTED TO THE FACTORS GOVERNING THERMAL OR HYGROMETRIC SHRINKAGE. IT IS GENERALLY DUE TO SOME DEFECTS IN THE MANUFACTURE OF THE CONCRETE OR APPLICATION OF THE SURFACINGS. /LCPC/A/RRL/

  • Availability:
  • Supplemental Notes:
    • Vol 22, No 12, PP 442-426, 10 FIG, 3 TAB, 9 REF
  • Authors:
    • Brachet
    • Baron, J
  • Publication Date: 1967-12

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00212910
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jun 11 1971 12:00AM