ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 1 October 2011
Page Count: 10

Corrosion of Rebar and Role of Fiber Reinforced Concrete

Sappakittipakorn, Manote
Dept. of Civil Engineering, Univ. of British Columbia, Vancouver, BC

Banthia, Nemkumar
Dept. of Civil Engineering, Univ. of British Columbia, Vancouver, BC

(Received 21 March 2011; accepted 29 August 2011)

Abstract

Recent studies have shown that fiber reinforcement of concrete reduces its permeability to water and enhances its service life. In this study, this finding was extended to determine if fiber reinforcement can also control corrosion of reinforcing steel in traditionally reinforced concrete. Two fiber types, cellulose and polypropylene, at 0.1 % and 0.3 % volume fraction, were examined. Two series of tests were performed. In the first series, chloride transport characteristics were determined by using the Bulk Diffusion Test, the Silver Nitrate Spray Test and the Rapid Chloride Permeability Test. In the second series, corrosion activity in reinforcing steel was monitored in loaded RC beams with and without fiber reinforcement for a year in a simulated marine environment. Results demonstrated that while the presence of fibers increased the coefficient of chloride diffusion based on total chlorides, there was a decrease in the coefficient related to free chlorides. Fibers therefore appear to bind the chlorides and inhibit their transport through concrete. Corrosion tests further corroborated these findings and indicated that fibers delayed the onset of corrosion in RC beams as long as the applied load did not exceed a certain threshold value.

Keywords:
fiber-reinforced concrete, corrosion, chloride diffusion, half-cell potential, galvanic current, linear polarization resistance, cracking, durability

Paper ID: JTE103873
DOI: 10.1520/JTE103873
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