Behavior of Overlaid Reinforced Concrete Slab Panels Under Cyclic Loading - Effect of Interface Location and Overlay Thickness

Most existing structures built in northern countries after World War II have deteriorated due to the use of techniques and materials producing poor durability and exposure to an aggressive environment, the use of deicing salts, significant temperature fluctuations, and, in the case of bridges, excessive vehicle loads. This article reports on a study undertaken to determine the suitability of using thin bonded concrete overlays as an effective rehabilitation technique for concrete bridge decks. The authors reports on one phase of an ongoing study; in this phase nine 3.3 x 1.0 x 0.2 m reinforced concrete slab panels with various configurations and different types of repair concrete were investigated. The performance of overlaid slab panels was evaluated by conducting pure bending static and repetitive loading of up to 500,000 cycles. The authors attempted to link mechanical response between the repaired area location and the nature of flexural stresses. They found that if the repaired area is situated in a compression zone, the induced stresses result in a low risk of interlayer delamination. On the other hand, if the repaired area is in a tension zone, the presence or the absence of reinforcing bars in the overlaid area is a key parameter controlling the development of damage at the interface. Interlayer delamination was systematically observed when there was no reinforcement. This damage appears to result from flexural stresses at the interface generated by the curvature imparted by the substrate to the overlay. However, damage at the overlay/substrate interface has little effect on the structural capacity of the repaired slab, because the reinforcing steel under tension provides greater resistance to the generated tensile stresses.

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  • Authors:
    • Lemieux, Martin
    • Gagne, Richard
    • Bissonnette, Benoit
    • Lachemi, Mohamed
  • Publication Date: 2005-5


  • English

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  • Accession Number: 01000390
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 26 2005 7:34AM