Abstract
The main purpose of the present work is to study the mechanical behavior and durability performance of recycled steel fiber reinforced concrete (RSFRC) under a chloride environment. To this end, the effect of chloride attack on the load-carrying capacity of pre-cracked RSFRC round panels is investigated by performing round panel tests supported on three points (RPT-3ps), considering the influence of the crack width and the fiber distribution/orientation profile. In addition, the influence of the adopted chloride exposure conditions on the post-cracking constitutive laws of the developed RSFRC is also assessed by performing numerical simulations for the prediction of the long-term performance of RSFRC under these aggressive conditions. The tensile stress–crack width relationship of RSFRC is derived by performing an inverse analysis with the RPT-3ps results. The obtained experimental and numerical results show a negligible effect of the chloride attack on the post-cracking behavior of RSFRC for the chloride exposure conditions and pre-crack width levels adopted in this study.
Highlights
90 days of chloride the cracked surfaces of pre-cracked panelsthe crack widths up to 1 attack, mm were completely penetrated by chlorides during with crack widths up to 1 mm were completely penetrated by chlorides during the immersion period, and corrosion products were visible in the recycled steel fibers (RSFs) located in the cracked surfaces; 2
Significant differences may occur in the progress of the three crack widths in round panels during RPT-3ps due to fiber distribution of RSFs at crack surfaces, with an inherent influence on the energy absorption of recycled steel fiber reinforced concrete (RSFRC) panels; 3
The stiffness parameters obtained in RSFRC panels indicate that the adopted corrosion induction conditions for RSFs had a negligible effect on the post-cracking behavior of cracked RSFRC up to a crack width of 1 mm; 4
Summary
FRC is being used in slabs and shells, such as the case of flooring and tunneling since the support redundancy of this type of structure favors the occurrence of a high level of stress redistribution during crack propagation, which increases their ultimate load regarding their cracking load [8,9]. These potentialities are being considered for using FRC in offshore applications [10,11]
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