EFFECT OF CONSTRUCTION PRACTICES ON DURABILITY - PART I

IN ORDER TO STUDY THE EFFECT OF CONSTRUCTION PRACTICES ON THE DURABILITY OF BRIDGE DECKS, SEVEN CONCRETE DECKS WERE OBSERVED DURING CONSTRUCTION. EACH DECK WAS THEN EXAMINED ANNUALLY FOR 5 YEARS, AND EVIDENCE OF DETERIORATION RECORDED UNDER FOUR HEADINGS: SURFACE MORTAR DETERIORATION (SMD), TRANSVERSE CRACKING, FRACTURE PLANES, AND SPALLING. THESE WERE RELATED TO SEVEN CONSTRUCTION FACTORS: FORM TYPE, SLUMP, AIR CONTENT, PLACEMENT TIME, FINISHING TIME, DELAY IN CURING, AND DEPTH OF CONCRETE COVER. ANALYSIS INDICATED THAT THE THREE DECKS BUILT WITH CONVENTIONAL REMOVABLE FORMS EXHIBITED HIGHER RATES OF CRACKING AND LOWER RATES OF SMD THAN THE FOUR DECKS BUILT WITH STAY-IN-PLACE (SIP) FORMS. THOSE SECTIONS HAVING AVERAGE SLUMPS GREATER THAN 3 IN. SHOWED A HIGHER FREQUENCY OF DEEP SMD THAN THOSE HAVING AVERAGE SLUMPS LESS THAN 3 INCHES. AN UNEXPLAINED ASSOCIATION BETWEEN HIGH AIR CONTENT AND SIP FORMS PRECLUDED ANY MEANINGFUL ANALYSIS OF THE INFLUENCE OF AIR CONTENT AND THE RATE OF DETERIORATION. DELAYS IN PLACEMENT AND FINISHING TIMES WERE ASSOCIATED WITH HIGHER RATES OF CRACKING. DELAYS IN START OF CURING WERE ASSOCIATED WITH HIGHER RATES OF SMD. SPANS OF DECKS HAVING LESS THAN 1.5 INCHES OF COVER OVER TOP STEEL EXHIBITED FRACTURE PLANES AND/OR SPALLS. /FHWA/

  • Corporate Authors:

    Pennsylvania State University, University Park

    Pennsylvania Transportation Institute, Transportation Research Building
    University Park, PA  United States  16802

    Pennsylvania Department of Transportation

    1215 Transportation and Safety Building
    Harrisburg, PA  United States  17120

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Cady, P D
    • Carrier, R E
    • Bakr, T
    • Theisen, J
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00214528
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Study No 63-6
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Mar 27 1972 12:00AM