Review and Specification for Shrinkage Cracks of Bridge Decks

There are a significant amount of bridge decks with cracking, including some made with internal curing, polymer-modified materials, or fiber-reinforced concrete. It is important to have a test procedure to verify whether the material itself can withstand the shrinkage strains particularly associated with restraint created by the underlying structure. The existing standard free shrinkage bar test is not sufficient to capture the restraint-created shrinkage. Without a restrained shrinkage test, any potential materials used for such structures could never be properly characterized to determine if it can withstand such cracking. There needs to be a better way to characterize materials used on bridge decks to determine reduced shrinkage cracking due to deck restraint. Additional research is still needed on how some materials, such as fiber-reinforced concrete, will perform at early-ages as an overlay or bridge deck. The primary objective of this research project is to 1) draft a recommended specification which describes the test procedure to evaluate bridge deck materials and 2) assist Utah Department of Transportation (UDOT) to build restrained shrinkage test apparatus and compare commonly-used bridge deck materials for restrained shrinkage performance. The secondary objective of this research project is to review existing cracking found on bridge decks in Utah and comparison with measured lab shrinkage cracking using UDOT test apparatus. Additional matching funding for $17,112 is being sought out through the Mountain Plains Consortium to experimentally determine how properties of fiber-reinforced concrete will change with time at early ages. This separate project can be improved with the use of the same restraint-shrinkage measurement developed as part of the primary objective of this UDOT research project. It will also allow for additional material testing to be performed to validate the new UDOT test procedure against realistic and numerically-determined cracking. The above objectives will be accomplished through a phased approach. The following major tasks are anticipated: 1) Summarize literature review in memo document; 2) Write a draft test procedure specification and apparatus equipment specifications of the recommended shrinkage test procedure; 3) Assist in creating restrained shrinkage test apparatus (at the UDOT central materials lab, with equipment already purchased by UDOT); 4) Assist in performing interagency survey to determine existing shrinkage crack testing specifications; 5) Assist in gathering a list of existing bridge decks with shrinkage cracking; 6) Assist in creating a list of mixture designs and materials used on those cracked bridge decks; 7) Meet with TAC after testing apparatus has been setup; Meet again after data on cracked decks and mixtures have been collected; Meet before final presentation and report; 8) Cast specimens of at least three unique mixtures to verify test procedure. Compare restrained shrinkage values from UDOT lab to field cracking found on bridge decks in Utah; 9) Finalize test procedure and equipment details; 10) Draft Contractor Specification document; 11) Present test procedure and analysis results at UDOT Annual Conference; and 12) Write final report.

    Language

    • English

    Project

    • Status: Active
    • Funding: $18767
    • Contract Numbers:

      158473

    • Sponsor Organizations:

      Utah Department of Transportation

      4501 South 2700 West
      Project Development
      Salt Lake City, UT  United States  84114-8380
    • Project Managers:

      Hales, Thomas

    • Performing Organizations:

      University of Utah, Salt Lake City

      College of Engineering, Department of Civil Engineering
      Salt Lake City, UT  United States  84112-0561
    • Principal Investigators:

      Bordelon, Amanda

    • Start Date: 20141003
    • Expected Completion Date: 20160331
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01574337
    • Record Type: Research project
    • Source Agency: Utah Department of Transportation
    • Contract Numbers: 158473
    • Files: RiP, STATEDOT
    • Created Date: Aug 27 2015 12:41PM