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TRANSVERSE CRACKING OF BRIDGE DECKS - INFLUENCE OF TEMPERATURE AND RESTRAINED SHRINKAGE

SAPROO, MONIKA

Abstract Details

2003, MS, University of Cincinnati, Engineering : Civil Engineering.
Ohio Department of Transportation started a program of replacement of bridge decks by high performance concrete decks but the decks started showing cracks after just six to eight months or a season of construction. This study was taken up to ascertain the causes of this early cracking with emphasis on the study of the role of temperature and restrained shrinkage in cracking. Analysis of data from ODOT about its previously cast decks about their location, mix design, slump, compressive strength, average shrinkage, month of casting, ninety day chloride penetration values and temperature differential showed vast scatter, indicating that deck cracking is the compounded effect of several factors acting together and implied an in-depth study in various directions. To gain an insight into the role of temperature and restrained shrinkage in cracking, an experiment was done in an ODOT project involving a phased replacement of deck of a bridge (on US 127) over still water in Richland Township of Darke County in Ohio. Prior to casting, four pairs of vibrating wire gages were placed at the top and bottom of the reinforcement cage of deck at following locations * On the mid-span between two beams * Over the pier * Over the beam * Over the beam pier intersection. Hourly strains and corresponding Temperatures were measured and recorded for fifteen months. Numerical analysis and analytic study was done on the data obtained from site. Both phases of construction showed a different behavior so far as the pattern of strain generation is concerned. It was observed that the gages having least external restraint developed highest strains. The deck showed a wavy behavior with upward curvature at locations where deck had a beam below and downward curvature for locations where deck has no beam (restraint) below it. The temperature was seen to become a potential source for cracking only when a vast difference of temperature existed along the cross section of deck. Even after one year of casting the deck, only minor cracking was observed. This unexpected behavior of deck was attributed to good construction practices, especially proper curing.
Dr. Richard A. Miller (Advisor)

Recommended Citations

Citations

  • SAPROO, M. (2003). TRANSVERSE CRACKING OF BRIDGE DECKS - INFLUENCE OF TEMPERATURE AND RESTRAINED SHRINKAGE [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060898267

    APA Style (7th edition)

  • SAPROO, MONIKA. TRANSVERSE CRACKING OF BRIDGE DECKS - INFLUENCE OF TEMPERATURE AND RESTRAINED SHRINKAGE. 2003. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060898267.

    MLA Style (8th edition)

  • SAPROO, MONIKA. "TRANSVERSE CRACKING OF BRIDGE DECKS - INFLUENCE OF TEMPERATURE AND RESTRAINED SHRINKAGE." Master's thesis, University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060898267

    Chicago Manual of Style (17th edition)