Mechanical Behavior of the Interface Between Substrate and Repair Material

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Title: Mechanical Behavior of the Interface Between Substrate and Repair Material

Author(s): P. Paramasivam, K. C. g. Ong, and W. Xu

Publication: Special Publication

Volume: 206

Issue:

Appears on pages(s): 71-90

Keywords: bond strength, interface, mechanical behavior, repair material, repair method, steel fiber

Date: 4/1/2002

Abstract:
The service performance of repaired structures depends mainly on the mechanical properties of the substrate and repair materials and the mechanical behavior of the interface between them. However, in most studies in the literature, on ly bond strength is used to evaluate the repair and the deformation behavior of the interface is usually neglected. In this study, three slabs were cast using conventional concrete as a substrate. The substrate surface was roughened with jackhammers. A layer of 50-60 mm repair materials were cast by shotcreting or by hand. The test specimens were cored or cut to the required size. Direct tensile and compression tests were performed to evaluate the bond strength and mechanical behavior of the interface between substrate and repair materials. The test results indicate that the bond strenght was affected by the mix proportions and independent on the casting method and the inclusion of steel fibers. However the casting methods had a strong influence on the mechanical behavior of the interface between substrate and repair material.