Improving the Durability of the Inverted T-Beam Bridge System

The inverted T‐beam system provides an accelerated bridge construction alternative. The system consists of adjacent precast inverted T‐beams finished with a cast‐in‐place concrete topping. The system offers enhanced performance against reflective cracking and reduces the likelihood of cracking due to time dependent effects. Differential shrinkage is believed to be one of the causes of deck cracking in inverted T‐beam systems. The objective of this study was to develop mix designs that exhibit lower shrinkage and higher creep compared to typical deck mixtures, recommend a prescriptive mix design and a performance criterion to Virginia Department of Transportation (VDOT)that can be used in the inverted T‐beam system to combat effects of differential shrinkage. Ten different mix designs using different strategies to reduce shrinkage were tested for their compressive strength, splitting tensile strength, modulus of elasticity and unrestrained shrinkage. The four best performing mixes were selected for further study of their time dependent properties. The test data was compared against the data from various prediction models to determine the model that closely predicts the measured data. It was observed that ACI 209.2R‐08 model best predicted the time dependent properties for the four mixes tested in this project. Tensile stresses in the composite cross‐section of deck and girder, created due to difference in shrinkage and creep were quantified using an age adjusted effective modulus method. In this analysis, it was observed that mixes with normal weight coarse aggregate developed smaller stresses compared to those of mixes with lightweight coarse aggregate. Mixes with fly ash as supplementary cementitious material (SCM) developed smaller stresses at the bottom of deck when compared to mixes with slag as the SCM.

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  • Supplemental Notes:
    • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
  • Corporate Authors:

    Virginia Polytechnic Institute and State University, Blacksburg

    Department of Civil and Environmental Engineering
    Blacksburg, VA  United States  24061

    Rutgers University, Piscataway

    Center for Advanced Infrastructure and Transportation, 100 Brett Road
    Piscataway, NJ  United States  08854-8058

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Authors:
    • Roberts-Wollmann, Carin
    • Pulumati, Vijaykanth
  • Publication Date: 2018-11

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 95p

Subject/Index Terms

Filing Info

  • Accession Number: 01714500
  • Record Type: Publication
  • Report/Paper Numbers: CAIT‐UTC‐NC28
  • Contract Numbers: DTRT13-G-UTC28
  • Files: UTC, NTL, TRIS, ATRI, USDOT
  • Created Date: Aug 9 2019 12:46PM