SAWN JOINTS IN ASPHALT PAVEMENTS

SINCE TRANSVERSE CRACKS GENERALLY BECOME EVIDENT DURING PERIODS OF SUBFREEZING TEMPERATURES, THEIR PRESENCE HAS BEEN ATTRIBUTED TO THERMAL CONDITIONS WITHIN THE PAVEMENT STRUCTURE. STUDIES HAVE SHOWN THAT THE LOW TEMPERATURE PROPERTIES OF ASPHALT MIXES ARE LARGELY DEPENDENT UPON THE THERMAL AND RHEOLOGICAL PROPERTIES OF THE ASPHALT USED IN THE MIX. CONSIDERING ONLY THE ASPHALTIC CONCRETE PORTION OF A CONVENTIONAL FLEXIBLE PAVEMENT STRUCTURE, TWO POSSIBLE MECHANISMS PROMOTING TRANSVERSE CRACKING ARE (1) SIMPLE CONTRACTION OF THE ASPHALTIC CONCRETE AND (2) INDUCED THERMAL STRESSES WITHIN THE ASPHALTIC CONCRETE. WITH THE INTRODUCTION OF TRANSVERSE DUMMY JOINTS, IT WAS HOPED THAT INDUCED THERMAL STRESSES COULD BE RELIEVED AND CONTRACTION OF THE PAVEMENT SURFACE REDUCED, THE RESULT BEING A DECREASE IN THE FREQUENCY OF TRANSVERSE CRACKING. /CGRA/

• Supplemental Notes:
  • Vol 22, 9 PP, 1 FIG, 5 TAB
• Authors:
  • Christison, J T
• Conference:
  • Western Assoc Can Hwy Officials Proc
• Publication Date: 1969-4

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt concrete; Asphalt pavements; Contraction; Flexible pavements; Low temperature; Rheological properties; Sawed joints; Thermal properties; Thermal stresses; Transverse cracking; Transverse joints
• Subject Areas: Construction; Highways;

Filing Info

• Accession Number: 00214647
• Record Type: Publication
• Source Agency: CANADIAN GOOD ROADS ASSOCIATION
• Files: TRIS
• Created Date: Oct 13 1970 12:00AM