INVESTIGATION OF UNBONDED PCC OVERLAYS

UNBONDED PCC OVERLAYS WHICH WERE PLACED OVER OLD PCC PAVEMENTS WERE INVESTIGATED. TEST SECTIONS WERE CONSTRUCTED TO COMPARE THE EFFECT OF VARIOUS MATERIALS AS BOND BREAKERS. PERFORMANCE WAS MEASURED BY THE ABILITY OF THE OVERLAY SYSTEM TO PREVENT REFLECTIVE CRACKING. IT WAS CONCLUDED FROM THESE TESTS THAT AN ASPHALT, SUCH AS MC-250, WITH A LIGHT SAND COVER TO PREVENT PICKUP, REDUCES BOND SUFFICIENTLY TO PREVENT REFLECTIVE CRACKING, EVEN WHEN JOINT SPACING IS DIFFERENT FROM THAT OF THE BASE PAVEMENT. WAX BASE CURING COMPOUND, SPECIFIED AS A BOND BREAKER ON ONE PROJECT, DID NOT PERFORM AS WELL AS ANTICIPATED. AT A CONSIDERABLY HIGHER COST, ASPHALT CONCRETE ALSO PERFORMS VERY WELL AND IS PARTICULARLY WORTH CONSIDERATION WHEN LEVELING OF THE BASE PAVEMENT IS NECESSARY. /AUTHOR/

• Supplemental Notes:
  • D-5-29, 45d2-134
• Corporate Authors:

  California Division Highways

  /Implementation Dept
  ,   United States 
• Authors:
  • Spellman, D L
  • Woodstrom, J H
  • Neal, B F
• Publication Date: 1971-9

Subject/Index Terms

• TRT Terms: Asphalt concrete; Bonds; Fracture mechanics; Overlays (Pavements); Portland cement concrete; Reflection cracking
• Subject Areas: Highways; Maintenance and Preservation; Materials; Pavements;

Filing Info

• Accession Number: 00206477
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Files: TRIS, USDOT, STATEDOT
• Created Date: Jun 18 1972 12:00AM