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A STUDY OF TRANSVERSE CRACKING OF BITUMINOUS PAVEMENTS WITH DISCUSSION

AFTER A DISCUSSION OF EARLIER STUDIES OF TRANSVERSE CRACKING OF BITUMINOUS PAVEMENTS, A DISCUSSION IS GIVEN OF THIS INVESTIGATION WHICH WAS DESIGNED TO SURVEY EXISTING PAVEMENTS WHERE CONTRASTING TYPES OF TRANSVERSE CRACKING OCCURRED WITHIN CLOSE PROXIMITY TO EACH OTHER, EITHER ON THE SAME OR DIFFERENT PAVING CONTRACTS, WITH THE OBJECTIVE OF IDENTIFYING THOSE FACTORS WHICH DIFFERED BETWEEN THE TWO AND CAUSED THE CRACKING. CRACK COUNTS WERE MADE AT EACH AREA AND SAMPLES OF THE PAVEMENT, THE SURFACING AND ALL UNDERLYING LAYERS DOWN TO AND INCLUDING THE SUBGRADE WERE TAKEN. COMPLETE LABORATORY ANALYSES WERE MADE ON ALL MATERIALS SAMPLED FROM THE ROAD. IT WAS HOPED THAT AN ANALYSIS OF THE RESULTS FROM PAIRS OF CONTRACTS FROM THE SAME LOCALITY, WHICH SHOWED DIFFERING DEGREES OF CRACKING, MIGHT INDICATE THE FACTORS RESPONSIBLE FOR CRACKING. IF THIS COULD NOT BE DETERMINED, THEN AN ANALYSIS OF THE OVERALL RESULTS SHOULD SHOW WHAT FACTORS HAD THE GREATEST INFLUENCE ON THE OVERALL CRACKING PICTURE. THE DATA RESULTING FROM ANALYSIS OF THE MATERIALS, TAKEN FROM EACH TEST LOCATION, PRESENTED A SOMEWHAT CONFUSING PICTURE. IT WAS OBVIOUS THAT SEVERAL DIFFERENT FACTORS WERE INTERACTING TO CAUSE THE CRACKING AND THAT A MATHEMATICAL TECHNIQUE WOULD HAVE TO BE USED TO DETERMINE WHAT THEY WERE. A MODEL WAS ALSO NECESSARY TO DESCRIBE THE OBSERVED PHENOMENA AND, IF POSSIBLE, PREDICT CRACKING BEHAVIOR OF PAVEMENTS. SEVERAL METHODS WERE AVAILABLE SUCH AS FACTOR ANALYSIS, MULTIPLE REGRESSION, AND STEPWISE MULTIPLE REGRESSION ANALYSIS. THE FOLLOWING CONCLUSIONS HAVE BEEN DRAWN FROM THE RESULTS OF THE STUDY: (1) TRANSVERSE CRACKING IS LARGELY A TEMPERATURE PHENOMENON. THE CRACKING IS MORE SEVERE IN AREAS OF HIGH FREEZING INDEX. (2) ASPHALTS OF GOOD FLOW PROPERTIES AT LOW TEMPERATURE LEAD TO PAVEMENTS WHICH DISPLAY FEWER TRANSVERSE CRACKS. (3) THE TRANSVERSE CRACKING OF BITUMINOUS PAVEMENTS CAN BE REDUCED OR RETARDED BY USING SOFTER ASPHALTS OR ASPHALTS OF LOWER TEMPERATURE SENSITIVITY. (4) THE STIFFNESS MODULUS OF THE BITUMINOUS CONCRETE AT LOW WINTER TEMPERATURES IS IS THE MAJOR FACTOR GOVERNING TRANSVERSE CRACKING. THE GRADATION OF THE BASE AND SUBBASE MATERIAL HAS A SMALL EFFECT, BUT THE MAJOR EFFECT IS CONCENTRATED IN THE BITUMINOUS PAVEMENT. A DISCUSSION IS INCLUDED WHICH DEALS WITH VARIOUS QUESTIONS ARISING FROM THIS INVESTIGATION.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 383-423
  • Serial:
    • Volume: 41

Subject/Index Terms

Filing Info

  • Accession Number: 00211821
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 17 2002 12:00AM