Behavior of Reinforced Concrete Slabs Strengthened in Flexure by Concrete Overlays

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Title: Behavior of Reinforced Concrete Slabs Strengthened in Flexure by Concrete Overlays

Author(s): J.M. Calixto, E.F. Pires, S.A. Lima, and E.M. Piancastelli

Publication: Special Publication

Volume: 229

Issue:

Appears on pages(s): 389-406

Keywords: bond; concrete overlays; flexural strengthening; shear connectors; slabs

Date: 9/1/2005

Abstract:
The results of an experimental investigation on the behavior of one-way reinforced concrete slabs strengthened in flexure with a 5-cm concrete overlay are presented. Shear transfer at the concrete interface was provided in two separate ways: bond between the overlay and concrete substrate and dowel action only through shear connectors. Four series of slabs were tested: Series 2 and 3 were strengthened; Series 1 and 4 were cast at one time and had the geometry corresponded to the slabs before and after intervention, respectively. During the experiments, displacements, interlayer slips and strains were measured. The test results indicate expressively the better performance of slabs strengthened with a bonded overlay. A design procedure for evaluating the behavior of both repair procedures in service and at failure is proposed. Good correlation was also achieved.