MILDGLASS: GFRP Strand for Resilient Mild Pre-Stressed Concrete

The project will develop a glass fiber reinforced polymer (GFRP) strand prototype for application in Mild-Prestressed Concrete (MPC) elements to attain higher resiliency, sustainability, and corrosion resistance with respect to traditional steel prestressed concrete solutions. The prototype will entail favorable constructability and cost characteristics in contrast to corrosion resistant prestressing technologies currently available commercially. Work on Stage 1 will focus on developing, testing, and characterizing the GFRP strand prototype as a material system for concrete prestress. Different geometry configurations will be tested to select the optimal configuration from both mechanical performance and constructability perspectives. Mechanical characterization of the selected configuration will be performed that will include tensile, shear and bond strengths, flexural stiffness and cross sectional area. Pull strength under instantaneous and sustained load and relaxation will be investigated. The compatibility of the GFRP prototype strand with standard steel prestressing equipment will be tested. Different specimens will be tested under different sustained loads until failure. Results will allow extrapolating the material system’s behavior to about 100 years. Prototype GFRP strands will be tested under a sustained displacement corresponding to the guaranteed pull strength, defined earlier in the project. For creep rupture characteristics, prestress losses will be measured over relatively brief periods of time. Results will allow extrapolating the behavior of the material system up to about 100 years. Work in Stage 2 of the project will focus on developing and testing demonstrative structures reinforced with the GFRP prototype strand developed in Stage 1. Results collected on structural demonstrators will add to the material testing performed in Stage 1 and allow calibrating long-term model to extrapolate the behavior of the prototype GFRP strand and mild prestressed concrete structure until the end of their service life (~100 years). Flexural tests will be conducted to validate the proposed MPC design and confirm the effectiveness of the prototype GFRP strand as prestress reinforcement for concrete in real applications. This will be followed by structural demonstrator that involves technology deployment at the real scale. Demonstrator will be periodically monitored allowing calibration of the predictive models for creep and relaxation. Modeling will be performed to predict behavior up to 100 years using input from all testing phases. This would also help refine the design of MPC structural members and allow further optimization of the GFRP prototype via numerical modelling. Modeling will also provide output for life cycle cost (LCC) analysis and life cycle assessment (LCA). Economic and environmental implication of the technology to leverage field deployment will be refined.


  • English


  • Status: Active
  • Funding: $119400
  • Contract Numbers:

    Project 20-30, IDEA 207

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Jawed, Inam

  • Performing Organizations:

    University of Miami

  • Principal Investigators:

    Nanni, Antonio

  • Start Date: 20180814
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01677707
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-30, IDEA 207
  • Files: TRB, RiP
  • Created Date: Aug 13 2018 3:03PM