Abstract
For structural elements exposed to chloride environments, an important aspect of Recycled Steel Fiber Reinforced Concrete (RSFRC) durability is the corrosion resistance. In the present work, an experimental program was carried out to evaluate the long-term effects of chloride attack on the post-cracking behavior of RSFRC by performing splitting tensile tests and round panel tests. Two RSFRC mixtures defined based on the packing density optimization were produced with a fiber content of 0.8% and 1% per volume of concrete. The influence of different periods of chloride immersion was investigated, as well as the influence of fiber dispersion at crack surfaces of the specimens. Additionally, a simplified prediction of the long-term chloride penetration depth into uncracked RSFRC under immersion aggressive chloride exposure conditions was estimated. The RSFRC revealed high susceptibility to surface corrosion under the chloride exposure conditions adopted. However, the post-cracking resistance of RSFRC was not significant affected. The addition of RSF had a negligible effect in the diffusion of chloride ions into concrete, and the critical chloride content was higher than that found in conventional reinforced concrete structures.
Highlights
Chloride-induced reinforcement corrosion has been reported to be the leading cause of degradation of reinforced concrete (RC) structures exposed in coastal/marine environments [1,2]
double edge wedge splitting tests (DEWSTs) and round panel tests (RPTs) were carried out to assess the effects of chloride attack on the post-cracking
DEWSTs and RPTs were carried out to assess the effects of chloride attack on the post-cracking behavior of Recycled Steel Fiber Reinforced Concrete (RSFRC), considering the influence of different chloride exposure periods and fiber behavior of RSFRC, considering the influence of different chloride exposure periods and fiber distribution/orientation profile
Summary
Chloride-induced reinforcement corrosion has been reported to be the leading cause of degradation of reinforced concrete (RC) structures exposed in coastal/marine environments [1,2]. As reported in the literature [19,20,21,22,23,24,25], RSF have been successfully used in concrete to improve its post-cracking load bearing capacity and energy absorption performance, and to limit the crack width, with beneficial consequences in terms of concrete durability. RSF are used in concrete to restrain the crack opening by bridging the crack surfaces, which leads to improved post-cracking load bearing and energy absorption capacity, with beneficial consequences in terms of concrete durability [21,27,28] This ability of the RSF to transfer stresses through a cracked section depends on the effectiveness of the fiber reinforcement, i.e., fiber properties and fiber orientation and distribution [29]. Cycles in chloride solution were estimated based on the Fick’s 2nd law
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