Evaluation of Different Techniques for Repair of Shear-span Corroded RC Beams

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Title: Evaluation of Different Techniques for Repair of Shear-span Corroded RC Beams

Author(s): Hesham Elhuni and Khaled A. Soudki

Publication: Special Publication

Volume: 322

Issue:

Appears on pages(s): 6.1-6.20

Keywords: Fiber reinforced cement based matrix; Shear-span corrosion; Bond failure; Patch repair; End slip

Date: 6/18/2018

Abstract:
This paper examined the effects of corrosion of the longitudinal reinforcement in the shear span on the structural behavior of RC beams and the effectiveness of three rehabilitation schemes. The experimental program consisted of testing fifteen medium-scale reinforced concrete beams, 150 mm(6 in) wide x 350 mm(14 in) deep x 2400 mm(95 in) long, under static load (displacement-control configuration). The test variables included: span to depth ratio (a/d=2.4 and 3.4), anchorage end condition (anchored and unanchored), the degree of corrosion (2.5%, 5%, 7.5%, 15% mass loss), and repair schemes (patch repair, U wrap with Glass fiber reinforced cement-based composite, U wrap with Carbon fiber reinforced cement-based composite). Following corrosion and repair, all specimens were loaded statically to failure. Test results showed no major effect of shear-span corrosion on the flexural behavior for the beams with end anchorage whereas a noticeable effect on the flexural behavior was observed for beams with no end anchorage. The corrosion degree and the shear span to depth ratio affected the mode of failure for the specimens with no end anchorages. The type of repair significantly affected the overall behavior of the repaired-corroded specimens.