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Title: Post-Cracking Response of Hybrid Recycled/Industrial Steel Fiber-Reinforced Concrete

Author(s): Enzo Martinelli, Carmine Lima, Marco Pepe, Antonio Caggiano, and Ciro Faella

Publication: Symposium Paper

Volume: 326


Appears on pages(s): 64.1-64.10

Keywords: FRC, waste tires, hybrid FRC, modelling, cracked-hinge approach

DOI: 10.14359/51711047

Date: 8/10/2018


The present study aims at investigating the influence of Recycled Steel Fibers (RSFs) recovered from waste tires on the resulting post-cracking response of Fiber-Reinforced Concrete (FRC) mixtures, when they are employed for replacing conventional Industrial Steel Fibers (ISFs). It moves from the results of four-point bending tests carried out on a series of specimens made of Hybrid FRC, namely reinforced by both RFSs and ISFs. Then, the paper proposes a theoretical model based on a meso-mechanical formulation merged into a cracked-hinge approach. The model is capable of taking into account explicitly the diverse geometric and mechanical properties of RSFs and ISFs and, hence, it is employed for interpreting the results of the aforementioned bending tests. Some comparisons between the experimental results and the theoretical predictions are presented with the aim to corroborate the mechanical consistence of the proposed model.

Finally, it is worth highlighting that this study has been carried out at the STRuctural ENGineering Testing Hall (STR.ENG.T.H) of the University of Salerno, as part of the “SUPERCONCRETE” Project (H2020-MSCA-RISE-2014 – n. 645704).