THERMAL FRACTURE PHENOMENA IN BITUMINOUS SURFACES

THIS PAPER EXPLORES THE PHENOMENON OF THERMALLY INDUCED CRACKING IN BITUMINOUS SURFACES AS A PROBLEM PRIMARILY ASSOCIATED WITH DESIGN. LOW-TEMPERATURE EFFECTS ON PAVEMENT PERFORMANCE ARE EXAMINED AND THE NEED FOR MODIFYING CURRENT MIXTURE DESIGN PROCEDURES IS DISCUSSED. SINCE ANY SUCH DESIGN REQUIREMENTS WOULD BE CONCERNED WITH FRACTURE SUSCEPTIBILITY, AN APPROXIMATE PROCEDURE FOR CALCULATING THERMALLY INDUCED STRESSES IS PRESENTED WHICH RECOGNIZES THE PROBABLE STIFFNESS AND TEMPERATURE GRADIENTS THAT OCCUR IN FIELD SERVICE. A CONSIDERATION OF FUNDAMENTAL MECHANISMS INVOLVED IS ESSENTIAL TO ADEQUATELY FULFILLING DESIGN OBJECTIVES, CONSEQUENTLY, AN HYPOTHESIS HAS BEEN ADVANCED TO THE EFFECT THAT THERMALLY INDUCED CRACKING OCCURS IN TWO MAIN PHASES. THESE CONSIST ESSENTIALLY OF LIMITED-DEPTH CRACK INITIATION, AND SUBSEQUENT FULL-DEPTH PROPAGATION WITH RISING AIR TEMPERATURES. THE PERTINENT MECHANICS ARE EXPLAINED AND THE HYPOTHESIS APPEARS TO BE COMPATIBLE WITH OBSERVED PHENOMENA. SEVERAL PRACTICAL IMPLICATIONS OF THE HYPOTHESIS ARE DISCUSSED AND THESE RELATE PRIMARILY TO THE DEVELOPMENT OF MIX DESIGNS TO MITIGATE OF REDUCE CRACKING AND TO THE POSSIBLE USE OF 'GOOD' AND 'POOR' ASPHALTS IN THE SAME PAVEMENT STRUCTURE. IT IS SUGGESTED THAT MORE EFFICIENT AND ECONOMICAL USES OF AVAILABLE MATERIALS MAY BE POSSIBLE IN DESIGNING FOR THE LOW-TEMPERATURE CRACKING PROBLEM. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 136-153
  • Monograph Title: Control of pavement slipperiness: asphalt pavement cracking
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00207026
  • Record Type: Publication
  • Report/Paper Numbers: HS-005 947, HS-009 490
  • Files: TRIS, TRB, ATRI
  • Created Date: Jul 28 1994 12:00AM