EFFECTS OF CURING AND FALSEWORK SUPPORT PERIODS ON DEAD LOAD DEFLECTIONS OF REINFORCED CONCRETE SLAB BRIDGES

LARGE VARIATIONS IN ULTIMATE DEAD LOAD DEFLECTIONS OF REINFORCED CONCRETE BRIDGES HAVE BEEN OBSERVED. A RESEARCH PROJECT WAS CONDUCTED TO DETERMINE THE INFLUENCE OF TWO PARAMETERS ON THE DEFLECTION OF SLAB TYPE BRIDGES. QUARTER-SCALE MODELS OF TWO IDENTICAL THREE-SPAN CONTINUOUS REINFORCED CONCRETE SLAB BRIDGE PROTOTYPES WERE CONSTRUCTED AND TESTED WITH VARIABLE CURING TIMES AND FALSEWORK SUPPORT PERIODS. INCREASING THE CURING PERIOD FROM 7 TO 21 DAYS AND/OR SUPPORTING THE SPANS FROM 7 TO 10 DAYS HAD INSIGNIFICANT EFFECTS ON DEFLECTIONS; WHEREAS, THE DIFFERENCE IN DEFLECTIONS BETWEEN 10 AND 21 DAY SUPPORT PERIODS WAS SIGNIFICANT. AN "EFFECTIVE MODULUS" OF 500,000 PSI SHOULD BE USED IN CALCULATING ULTIMATE DEFLECTIONS OF REINFORCED CONCRETE STRUCTURES SUPPORTED ON FALSEWORK FOR ONLY TEN DAYS. /FHWA/

  • Supplemental Notes:
    • Contract D-4-14
  • Corporate Authors:

    Utah State University, Logan

    Extension Services
    Logan, UT  USA  84321

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Roberts, J E
  • Publication Date: 0

Media Info

  • Pagination: 74 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00214546
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Final Rept
  • Files: TRIS, USDOT
  • Created Date: Jan 11 1974 12:00AM