Statistical analysis of an experimental database on residual flexural strengths of fiber reinforced concretes: Performance‐based equations

Abstract

The postcracking capacity of fiber reinforced concrete (FRC) mainly depends on the content, material, and geometry of the fibers considered. Even though the general influence of these factors on FRC behavior has been extensively addressed, the uncertainty of the FRC performance prediction along with the variability of the results still poses a challenging issue that needs to be solved to encourage the use of FRC for design and construction purposes. In this line, a database including the results of the flexural residual strength obtained from different experimental programs combined with the results of previous studies has been gathered and analyzed herein to obtain general correlations and trends providing additional information about the influence of the fibers in FRC behavior, these meant to serve for initial design stages (e.g., make decisions on the type and amount of fibers based on technical and economical requirements). The results are analyzed distinguishing between the fiber material, the fiber shape, the aspect ratio and tensile strength. The results presented herein may provide valuable information on the initial prediction of the residual strength of FRC to fully take advantage of the mechanical properties of the material.

Experimental investigation of fiber content and length on curing time‐dependent mode‐I fracture behavior and properties of cemented paste backfill and implication to engineering design

“…However, the difference in the peak load is getting pronounced with time, which means the crack‐arresting ability is strengthening with time. It should be noted that a crack opening distance is required to activate the reinforcement through synthetic fibers 53 . Therefore, the enhanced peak load of FR‐CPB indicates that crack propagation also occurs before the catastrophic failure.…”

“…It should be noted that a crack opening distance is required to activate the reinforcement through synthetic fibers. 53 Therefore, the enhanced peak load of FR-CPB indicates that crack propagation also occurs before the catastrophic failure. Correspondingly, the fiber inclusion is able to influence the prepeak behavior of FR-CPB.…”

Design of Steel Fibre Reinforced Concrete Structures According to the Annex L of the Eurocode-2 2023

“…As acknowledged in the BD and other relevant literature dealing with the design basis FRC [12,14], the post-cracking (residual hereinafter) tensile properties of this material are known to be subjected to several sources of uncertainty. Fibre distribution and orientation anisotropy are the dominant sources of variability that lead to a total scatter in the notched beam test EN 14651 [15] ranging between 10% to 30% [16,17] depending on the amount of fibres, fresh concrete properties, and other aspects [18]. This scatter observed in the EN 14651 beams tends to be superior to that observed in the final structure due to the usually larger volume of SFRC involved in the cracked areas of the latter.…”

Effect of water to cement (W/C) ratio and age on mechanical behavior of tire‐recycled steel fiber reinforced concrete

“…[19][20][21] The reinforcing capability of these fibers makes them prominent as one of the practical solutions for improving the hardened properties of the concretes. [22][23][24] It is worth mentioning industry uses high-strength steel wires for tire production, so the quality of steel fibers recovered from waste tires is superior to standard industrial fibers available in the market (recycled steel fibers have more ductility and higher tensile strength than steel fibers). [25][26][27] Since recycled steel fiber concrete is made of different ingredients (i.e., cement, water, fine and coarse aggregate, and fiber), the weight percentage of each ingredient influences the mechanical properties of fresh and hardened concrete.…”

“…So disposing of about 5.2 billion tires led many researchers to be interested in using tire recycled steel fibers as a substitute for commercial steel fibers 19–21 . The reinforcing capability of these fibers makes them prominent as one of the practical solutions for improving the hardened properties of the concretes 22–24 . It is worth mentioning industry uses high‐strength steel wires for tire production, so the quality of steel fibers recovered from waste tires is superior to standard industrial fibers available in the market (recycled steel fibers have more ductility and higher tensile strength than steel fibers) 25–27 …”