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NCHRP Report 654: Evaluation and Repair Procedures for Precast/Prestressed Concrete Girders with Longitudinal Cracking in the Web (2010)
National Cooperative Highway Research Program (NCHRP)

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Tadros, Maher K, Badie, Sameh S, Tuan, Christopher Y, Transportation Research Board. "4.3 Suggestions for Future Research." NCHRP Report 654: Evaluation and Repair Procedures for Precast/Prestressed Concrete Girders with Longitudinal Cracking in the Web. Washington, DC: The National Academies Press, 2010.

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Page
63
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Page
63
Front Matter (R1-R10)
Summary (1-3)
1.2.1 Evolution of Permissible Crack Widths (4-6)
1.2.2 Sources of End Zone Cracking (7-8)
1.2.3 Design of End Zone Reinforcement (9-9)
1.3.1 Epoxy Injection Procedure by PCI Manual for the Evaluation and Repair of Precast, Prestressed Concrete Bridge Products (10-10)
1.5 Applicability of Results to Highway Practice (11-11)
1.6 Organization of the Report (12-12)
Chapter 2 - Research Approach (13-14)
3.1 National Survey (15-15)
3.2.1 Introduction (16-16)
3.2.2 Description of the Test Specimens and Test Setup (17-20)
3.2.3 Test Setup (21-21)
3.2.4 Test Results (22-29)
3.2.5 Full-Scale Testing Conclusions (30-31)
3.3.2 Description of the Test Specimens (32-34)
3.3.3 Preparation of the Test Specimens (35-35)
3.3.4 Test Results (36-37)
3.3.5 Discussion and Conclusions (38-39)
3.4.2 Durability Test, Stage I (40-41)
3.4.3 Durability Test, Stage II (42-46)
3.4.4 Durability Test, Stage III (47-48)
3.5.1 Introduction (49-49)
3.5.2 Nebraska Department of Roads (NDOR) (50-52)
3.5.3 Virginia Department of Transportation (VDOT) (53-57)
3.6 Manual of Acceptance, Repair, or Rejection (58-58)
3.7 Improved Crack Control Reinforcement Details for Use in New Girders (59-60)
3.8 Proposed Revisions to the AASHTO LRFD Bridge Design Specifications (61-61)
4.2 Implementation of Research Findings in Highway Communities (62-62)
4.3 Suggestions for Future Research (63-63)
References (64-64)
Appendices (65-65)
Abbreviations used without definitions in TRB publications (66-66)

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63 paper will be prepared for publication in the PCI Journal 4.3 Suggestions for Future Research or the ACI Structural Journal. Also, the research team will approach NDOR and VDOT to present the findings and No further research into the acceptance, repair, and rejec- recommendations of this project. This may be done through tion of web end cracking due to prestress transfer is sug- direct meetings with the bridge division engineers or through gested. Further research to develop finite element modeling arranged seminars. of the end zone of pretensioned members should be of value The research team will submit the proposed change to in optimizing the bursting reinforcement, especially as larger Article 5.10.10.1 of the AASHTO LRFD specifications to the than 0.6-in.-diameter strands and higher than 15 ksi concrete T-10 AASHTO Committee for possible adoption. become more common in practice.