Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Anchor Design to Prevent Debonding of Repair Mortar in Repaired Concrete Members

  • Published : 2005.08.01
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Abstract

Reinforced concrete beams or slabs are often strengthened or repaired using polymer modified cement concrete Stresses can develop in the structure by ambient temperature changes because thermal coefficients of the repair material and the existing concrete are typically different. Especially, shear stress often causes debonding of the interface. In this study, a rational procedure was developed where anchors can be designed in strengthened or repaired concrete members to prevent debonding at the interface. The current design procedure considers thicknesses and elastic moduli of the repair material and existing concrete, ambient temperature change, length, and beam-vs.-slab action. The procedure is also applicable to stresses developed by differential drying shrinkage.

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References

  1. Won, M. C, Kim S. M.; Merritt D. and McCullough B. F., 'Horizontal Cracking and Pavement Distress in Portland Cement Concrete Pavement', the 27th International Air Transport Conference, ASCE, Orlando, Florida, U.S., 2002
  2. Chen, D., Cheng, S., and Gerhardt, T.D., 'Thermal Stresses in Laminated Beams', Journal of Thermal Stresses, Vol.5, No. 1, U.S., 1982, pp.67-84 https://doi.org/10.1080/01495738208942136
  3. Hess, M.S., 'The End Problem for a Laminated Elastic Strip: Differential Expansion Stress', Journal of Composite Materials, Vol.3, U.S., 1969, pp.630-641 https://doi.org/10.1177/002199836900300404
  4. Choi, D. U., Fowler, D.W., and Wheat, D. L., 'Thermal Stresses in Polymer Concrete Overlays', American Concrete Institute, ACI Special Publication SP-166, Properties and Uses of Polymers in Concrete, U.S., 1996, pp.93-122
  5. Fowler, D. W, Choi, D. U., Zalatimo, J., and Wheat, D. L., 'Stresses in PC Overlays due to Thermal Changes', ICPIC, 10th International Congress on Polymers in Concrete, Hawaii, U.S., 2001, in CD-rom
  6. Choi, D. U. and Lee, C. H., 'Shrinkage-Induced Stresses at Early-Ages in Composite Concrete Beams', KCI Concrete Journal, Vol. 14, No. 1, Korea, 2002, pp. 15-22
  7. Silfwerbrand J., 'Stresses and Strains in Composite Concrete Beams Subjected to Differential Shrinkage', ACI Structural J., Vol.94, No.4, 1997, pp.227-238
  8. ACI 318, Building Code Requirements for Structural Concrete (ACI 318-02) and Commentary (ACI 318R-02), American Concrete Institute, U.S., 2002
  9. Fuchs, W., Eligehausen, R., Breen, J.E., 'Concrete Capacity Design (CCD) Approach for Fastening to Concrete', ACI Structural J., Vol.92, No.1, 1995, pp.73-94
  10. ACI 349, Code Requirements for Nuclear Safety Related Concrete Structures (ACI 318-97), American Concrete Institute, U.S., 1997