SURVEY OF CRACKING IN PORTLAND CEMENT CONCRETE PAVEMENT IN OREGON

FROM 1959 THROUGH 1963 ABOUT 87 LANE MILES OF PORTLAND CEMENT CONCRETE PAVEMENT IN OREGON BUILT ON I-15 DURING 1958-59-60, WERE OBSERVED FOR THE PURPOSE OF EVALUATING DESIGN IN REGARD TO THE AMOUNT OF REINFORCING STEEL AND THE SPACING OF CONTRACTION JOINTS. THE PAVEMENT WAS 8 INCHES THICK, 24-FEET WIDE AND LANE-AT-A-TIME CONSTRUCTION. CONTRACTION JOINTS WERE SPACED AT 61.5 FEET AND THE SLABS WERE REINFORCED WITH 6X12-1/4 WELDED WIRE FABRIC PLACED AT A NOMINAL DEPTH OF 2 1/2 INCHES BELOW THE PAVEMENT SURFACE. ONE-INCH DIAMETER, 18-INCH LONG DOWELS ON 12-INCH CENTERS WERE USED IN ALL CONTRACTION JOINTS. NO. 5 DEFORMED BARS, 3 FEET LONG AND SPACED AT 3 TO 3 1/2 FEET WERE USED IN THE LONGITUDINAL JOINT. THE PAVEMENT WAS CURED WITH VARYING AMOUNTS OF A MEMBRANE FORMING COMPOUND. NEARLY ALL OF THE CRACKS WERE TRANSVERSE OF THE PAVEMENT, HAIRLINE IN NATURE, FREE OF SPALLING AND APPEARED TO HAVE NO EFFECT ON PAVEMENT PERFORMANCE. CRACKING WAS FAR MORE PREVALENT IN THE OUTER THAN IN THE INNER LANES OF THE PAVEMENT AND IN THE CONCRETE PLACED IN THE MORNING THAN IN THAT PLACED AFTER MIDDAY. IT WAS CONCLUDED THAT THE REINFORCING STEEL USED IN THE 61.5-FOOT SLABS MET THE REQUIREMENTS OF SATISFACTORY PERFORMANCE AND MINIMIZATION OF CRACKING COULD HAVE BEEN ACCOMPLISHED BY MORE LIBERAL APPLICATION OF THE MEMBRANE CURING COMPOUND OR BY AFTERNOON AND EVENING PAVING.

  • Supplemental Notes:
    • Hpr-1/3/, BPR 4, STATE 20-08
  • Corporate Authors:

    Oregon State Highway Commission

    ,    
  • Authors:
    • Beecroft, G W
  • Publication Date: 1966-4

Subject/Index Terms

Filing Info

  • Accession Number: 00206272
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Jul 1 1994 12:00AM