Mechanical Behavior of Repaired Beams Under Static Loading

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Title: Mechanical Behavior of Repaired Beams Under Static Loading

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

Publication: Special Publication

Volume: 186

Issue:

Appears on pages(s): 59-80

Keywords: bonding strength; differential shrinkage; failure mode; flexural rigidity; reinforced concrete beams; repair material; repair method; static loading; steel fiber

Date: 5/1/1999

Abstract:
A total of 15 repaired and unrepaired reinforced concrete beams was tested under static loading in this study. The beams were of rectangular cross-section, 100 by 120 mm, and tested in flexure in simply supported mode on a span of 600 mm under a line load at mid-span. These include control beams, which were unrepaired, and beams repaired by shotcreting prepacked materials, shotcreting mortar, casting prepacked materials and casting prepacked material with steel fibres. The performance of the repaired beams statically-loaded to failure was monitored. The influence of differential shrinkage between repair material and substrate, bonding strength, casting method and the presence of steel fibres on the mechanical behaviour of repaired beams are discussed in this paper. The test results indicated that the mechanical properties of the repaired properties and the mix proportions of the repair materials used, and the repairing methods employed. The flexural stiffness of the repaired beams could be increased by using steel fibres, improving the bond quality between substrate and repair materials, and selecting appropriate repair method.