PART 2 EFFECTIVENESS OF VARIOUS BITUMINOUS COVERS IN PREVENTING BRIDGE DECK DETERIORATION

THREE HUNDRED BRIDGE DECKS WERE SURVEYED FOR THREE YEARS TO DETERMINE THE RATE OF PROGRESS OF DETERIORATION AND EFFECTIVENESS OF BITUMINOUS COVERS IN PREVENTING DAMAGE. COVERS WERE CHANGED ON MANY BRIDGES DURING THE PERIOD, LEAVING ONLY 197 WITH CONSTANT COVER. MOST OF THE HOT MIXES HAD BEEN ON THE BRIDGES SINCE THEIR CONSTRUCTION SIX YEARS PREVIOUSLY, WHEREAS THE OTHER DECKS WERE BARE IN 1961. ALTHOUGH HOT MIXES AND COLD MATS HAVE SIMILAR THICKNESSES, THEY ARE DIFFERENT FROM EACH OTHER AND FROM THE OTHER CATEGORIES IN CONSTRUCTION AND BEHAVIOR. HOT MIXES SHOWED THE MOST DETERIORATION AND COLD MATS THE LEAST IN THIS INVESTIGATION. THE APPARENT SUPERIOR PERFORMANCE OF COLD MATS MAY NEED TO BE DISCOUNTED SLIGHTLY TO ABOUT THAT OF SEALS BECAUSE OF THE DIFFICULTY ENCOUNTERED IN IDENTIFYING DETERIORATION UNDER COLD MATS. DETERIORATION OF BARE DECKS WAS PROGRESSING AT A RATE OF OVER SIX PERCENT OF THE DECK AREA PER YEAR, AND REACHED FOUR TIMES AS MUCH DETERIORATION AS UNDER SEALS. SEALS WERE USUALLY EFFECTIVE IN PREVENTING DAMAGE IF SEVERE DETERIORATION HAD NOT OCCURRED BEFORE THE SEALS WERE APPLIED. /AUTHOR/

  • Supplemental Notes:
    • No 64-3, No HPR-1 (6)
  • Corporate Authors:

    Kansas State Highway Commission

    State Office Building
    Topeka, KS  USA  66612

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  USA  20590
  • Authors:
    • Worley, H E
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00210442
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Jul 14 1970 12:00AM