Abstract
We report test results from an experimental study to investigate the effectiveness of carbon fiber-reinforced polymer (CFRP) against reinforcing steel bar corrosion. Twelve reinforced-concrete pile specimens of 180 mm square by 1,600 mm long were cast. Three pile specimens were corroded to 5% steel mass loss and then strengthened with CFRP sheets; four specimens were strengthened by using CFRP sheets, whereas the remaining five specimens were not strengthened. The specimens were placed in a simulated marine environment, and corrosion was induced by an impressed current technique. At different theoretical corrosion degrees, nondestructive tests were performed to investigate the corrosion activity of the pile specimens, and destructive tests were performed to determine reinforcing steel bar mass loss. Based on the findings, the effectiveness of the CFRP-strengthened RC piles under aggressive marine environmental conditions was established.
Highlights
The deterioration of marine reinforced-concrete (RC) structures induced by reinforcing steel bar corrosion is a global problem [1]
The corrosion potentials in tidal range zone were about −350 mv, −612 mv, −705 mv, and −810 mv at 5%, 10%, 15%, and 20% theoretical corrosion degree, which indicated that the rebar was in corrosion state from the corrosion degree of 5%
This paper presents results of an experimental program that investigates the resistance to corrosion of piles strengthened with carbon fiber-reinforced polymer (CFRP) sheets subjected to a simulated marine environment
Summary
The deterioration of marine reinforced-concrete (RC) structures induced by reinforcing steel bar corrosion is a global problem [1]. Especially RC pile foundation of high-pile wharf, experience reinforcement corrosion, because their concrete face is often wetted periodically by tidal levels, and dry-wet environments supply reinforcement corrosion with three necessary conditions: sufficient chloride ions, moisture, and oxygen. Several researchers have investigated the behavior of concrete members encased with CFRP sheets that were subjected to harsh environmental conditions such as temperature variations [5, 6], wet-dry cycles [7,8,9], freezing and thawing cycles [10,11,12,13], temperature extremes [14,15,16], and high chloride concentrations [17,18,19]. Simulated environmental conditions of temperature variations, high chloride concentrations, and wet-dry cycles
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