Title:
Behavior of Overlaid Reinforced Concrete Slab Panels Under Cyclic Loading- Effect of Interface Location and Overlay Thickness
Author(s):
Martin Lemieux, Richard Gagne, Benoit Bissonnette, and Mohamed Lachemi
Publication:
Structural Journal
Volume:
102
Issue:
3
Appears on pages(s):
454-461
Keywords:
bridge deck; concrete; repair
DOI:
10.14359/14417
Date:
5/1/2005
Abstract:
This paper presents the results of a comprehensive experimental investigation to assess the suitability of using thin bonded concrete overlays as an effective rehabilitation technique for concrete bridge decks. In this phase of an ongoing study, 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. An attempt was made to establish the link in terms of mechanical response between the repaired area location and the nature of flexural stresses. It was 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.