Corrosion behavior of steel fiber reinforced concrete under ambipolar stray current interference

Abstract

This paper preliminarily discussed the influence of measured stray current (SC) with ambipolar characteristics on the corrosion behavior of steel fiber in simulated pore solution and concrete environment by means of corrosion morphology observation, weight loss experiment, electrochemical test, etc. In simulated solution, the results indicated that the influence of short-term SC on steel fiber was limited, while the addition of Cl- led to the weakening or even disappearance of the self-repairing ability of passivation film and accelerated the occurrence of pitting corrosion on the surface of steel fiber. For steel fiber reinforced concrete (SFRC) samples, the circuit loop was formed through the discrete steel fiber, and its resistance depended on the steel fiber content. Although the concrete provided finite protection, the SFRC suffered from severe corrosion under the combined effect of intense SC and Cl-, and the preferential corrosion site was the end of steel fiber.