RE-CAST UTC Project Information
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Project Title
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Flexural Performance of Concrete Beams Strengthened using Different Repair Techniques
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Universities
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Rutgers, The State University of New Jersey and New York University
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Principal Investigator
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Hani Nassif, P.E., Ph.D. Rutgers, The State University of New Jersey and New York University
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PI Contact Information
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nassif@soe.rutgers.edu; 848-445-4414
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C0-Principal Investigator
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Kaan Ozbay, Ph.D. New York University
kaan.ozbay@nyu.edu; 646-997-3691
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Funding Source(s) and Amounts Provided (by each agency or organization)
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New Jersey Turnpike Authority (NJTA) and/or New Jersey Department of Transportation (NJDOT) $115,119 RE-CAST $230,238
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Total Project Cost
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$340,357
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Matching Agency ID or Contract Number
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NJDOT/NJTA : TBD RE-CAST: 00042134-01-2D
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RE-CAST Grant Award Number
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DTRT13-G-UTC45
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Start and End Dates
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Start Date: May 30, 2017 End Date: May 30, 2019
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Brief Description of Research Project
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The main objective of this research project is to evaluate the flexural performance of reinforced concrete (RC) beams repaired and strengthened using four different techniques. The techniques are External Prestressing (EP) using various types of metallic and non-metallic tendons, Fiber-Reinforced Ferrocement Composite (FR-FC) thin sections, Fiber-Reinforced Self Consolidating Concrete (FR-SCC), and Fiber-Reinforced Polymers (FRP) sheets. These implementations have been widely used and implemented to upgrade existing structures (such as parking structures, concrete bridge beams and decks, pier caps, substructures elements, etc.) but at different loading conditions. The ultimate goal of this research is to comparatively investigate the efficiency of the proposed techniques when applied on small and large scale specimens under the same loading conditions. Deflection at several locations, load-carrying capacity, concrete and steel rebar strain, failure modes and crack patterns of the strengthened beams during testing will be measured, collected, and analyzed for comparison purposes. In addition to the experimental program, analytical models will be developed and calibrated based on test data, and the load carrying capacity for each strengthening method will be predicted. The obtained results of the proposed models can be used as input parameters in the analysis and design of strengthened members. This study will have three phases: 1) The first phase (which is almost completed using funds from NJTA) focused on upgrading the conventional Ferrocement and SCC mixes with steel and polypropylene fibers. Several trial mixes are prepared and strength and shrinkage test are performed. In addition, the mechanical properties of the sheets and the strands implemented in the repaired specimens will be evaluated; 2) The second phase include the application of proposed mixes and techniques on small scale and large scale reinforced concrete beam specimens in order to evaluate the effect of such techniques on the overall structural performance; 3) The final phase will focus on the finite element modeling of the tested specimens using ABAQUS and propose analytical models that will be applied to enhance equations and procedures in repair codes and to predict the beams capacity for design purposes. At the end of this project, the team will use the outcomes of the material research namely, deterioration functions and estimated costs to perform life cycle cost analysis (LCCA) with the ultimate goal of optimal network-wide project selection. The team will make recommendations to the NJDOT and NJTA for field implementation of the most promising repair technique.
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Describe Implementation of Research Outcomes
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The results for the strengthening methods investigated, External Prestressing (EP), Fibers Reinforced Ferrocement Composite (FR-FC) thin sections mixes, Fiber reinforced SCC (FRSCC) mixes and Fiber reinforced polymers (FRP) sheets, will be made available to local transportation agencies. The results will help the local transportation agencies understand the state-of-the-art schemes to enhance and upgrade their own bridges using the best technique available based on the outcome for each system. Various techniques are applicable under different field conditions.
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Impacts/Benefits of Implementation
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The proposed techniques in strengthening concrete beams are effective methodologies in extending the service life of bridge deck and in making concrete infrastructures more durable and sustainable.
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Web Links
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Project website: http://recast.mst.edu/projects/flexuralperformanceofconcretebeams/
Final report: PDF
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Follow RE-CAST Tier-1 University Transportation Center