Title: Case Studies in Structural Repair of Pretensioned Concrete Products
Date: March-April, 1999
Volume: 44
Issue: 2
Page number: 74-79
Author(s): Alan S. Hoback, Alaa I. Hermiz

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Case studies show various types of repairs that are sometimes necessary to rectify precast, prestressed concrete products. The cases show types of damage that can be caused by overloading, underdesign,  quality control errors, accidents, and unanticipated events. The types of repair methods discussed are epoxying cracks, applying patches, enlarging the member with steel, and adding supplementary structural members. A precast member that is only slightly damaged can simply be patched or epoxied once the source of damage is removed. One case is found to be not repairable and the member is recast due to  the severity of the defect and the time and cost involved in repairing it. It is found that damage may be limited by meticulous production and quality control, good communication with erectors, and careful  detailing and testing of new design concepts.


1. PCI Committee on Quality Control Performance Criteria, "Fabrication and Shipment Cracks in Prestressed Hollow- Core Slabs and Double Tees," PCI JOURNAL, V. 28, No. 1, January- February  1983, pp. 18-39.

2. PCI Committee on Quality Control Performance Criteria, "Fabrication and Shipment Cracks in Precast or Prestressed Beams and Columns," PCI JOURNAL, V. 30, No. 3, May-June 1985, pp. 24-49.

3. Kannel, J., French, C., and Stolarski, H., "Release Methodology of Strands to Reduce End Cracking in Pretensioned Concrete Girders," PCI JOURNAL, V. 42, No. 1, January-February 1997, pp.  42-54.

4. Russell, B. W., Burns, N. H., and ZumBrunnen, L. G., "Predicting the Bond Behavior of Prestressed Concrete Beams Containing Debonded Strands," PCI JOURNAL, V. 39, No.5, September-October  1994, pp. 60-77.

5. Rose, D. R., and Russell, B. W., "Investigation of Standardized Tests to Measure the Bond Performance of Prestressing Strands," PCI JOURNAL, V. 42, No.4, July-August 1997, pp. 56-80.

6. Civjan, S. A., Jirsa, J. O ., Carrasquillo, R. L., and Fowler, D. W., "Instrument to Evaluate Remaining Prestress in Damaged Prestressed Concrete Bridge Girders ," PCI JOURNAL, V. 43, No. 2,  March-April 1998, pp. 62-71.

7. ACI Committee 503, "Use of Epoxy Compounds with Concrete," ACI 503R-93, American Concrete Institute, Farmington Hills, MI, 1993.

8. Shahawy, M.A., and Batchelor, B. D., "Shear Behavior of Full-Scale Prestressed Concrete Girders: Comparison Between AASHTO Specifications and LRFD Code," PCI JOURNAL, V. 41, No. 3,  May-June 1996, pp. 48-62.

9. Zobel, R. S., and Jirsa, J. O., "Performance of Strand Splice Repairs in Prestressed Concrete Bridges," PCI JOURNAL, V. 43, No. 6, NovemberDecember 1998, pp. 72-84.