Corrosion effects on pullout behavior of hooked steel fibers in self-compacting concrete

Abstract

Fiber reinforced concrete structures are subjected to chloride and carbonation penetration that could initiate corrosion of steel fibers, with eventual pernicious consequences in terms of structural and durability performance. Cracks in concrete are known to hasten initiation of steel corrosion in reinforced concrete structures. The investigation of the impact of cracks on the corrosion initiation and the associated interfacial damage between concrete and steel fibers is important for understanding the mechanical behavior of steel fiber reinforced concrete. In the present work, with the aim of studying the corrosion action on the mechanical behavior of cracked Steel Fiber Reinforced Self-Compacting Concrete (SFRSCC), an experimental program was performed to characterize the corrosion of hooked-end steel fibers and to assess the fiber pullout behavior in cracked concrete, previously subject to the action of corrosion by exposure to aggressive chloride environment.

Corrosion resistance of steel fibre reinforced concrete - A literature review

“…Friedel's salt), may increase the fibre-matrix frictional bond (Fig. 9c), as suggested in [123]. Which would explain the improved residual-tensile strength observed in part of the literature [12,53,56,123].…”

“…9c), as suggested in [123]. Which would explain the improved residual-tensile strength observed in part of the literature [12,53,56,123]. Finally, a combination of hydrating cement, calcium carbonate, corrosion products and salt crystals would eventually seal the crack, limiting the ingress of chlorides and oxygen; the fibres bridging the crack would serve as preferential surfaces for deposition of these compounds [122].…”

Durability of steel fibre reinforced rubberised concrete exposed to chlorides

“…The of the cement in the concretes. Increased residual flexural tensile strength has been attributed by some authors [46] to increased roughness of the fibre surface induced by formation of corrosion products in their surface, which could increase the fibre-matrix frictional bond.…”

Steel fibers pull-out after exposure to high temperatures and its contribution to the residual mechanical behavior of high strength concrete

“…The research concerning the behavior of SFRC after heating have focused the attention on the composite behavior. Although there are experimental results from pull-out tests [33] available in the literature and the deterioration produced by other phenomena like corrosion [34,35] or alkali silica reaction [36][37][38][39] has been studied, the effect of temperature on a single fiber pull-out has usually been indirectly analyzed from FRC tension tests results [31,38,39]. Recently, Abdallah et al [40] studied the pull-out behavior of steel fibers embedded in concrete after exposure to elevated temperatures.…”