Behavior of recycled steel fiber reinforced concrete under uniaxial cyclic compression and biaxial tests

Tire production is increasing every year due to the increase in vehicle sales. The generation and disposal of waste are inherent to life itself and have presented very serious problems to the human community in China. Recently, some research has been devoted to the use of tire-recycled steel fibers in concrete. This study is focusing on the use of tire-recycled steel fibers. Several volume ratios of tire-recycled steel fibers were used in concrete mix to fabricate and test. Reinforced concrete obtains evidence and satisfactory improvement by adding tire-recycled steel fibers, mostly in compressive strength, splitting strength, flexural tensile strength, and flexural toughness. The strength and flexural toughness of the tire-recycled steel fiber reinforced concrete are lower than those of industrial steel fibers. To obtain concrete with approximately the same strength or toughness, the content of tire-recycled steel fibers should be about 1%-2% higher than that of industrial steel fibers. In addition, the load-deflection curve tends to become fuller after the first crack, and the second peak of the load continues to increase. The steel fiber reinforced concrete is getting closer to the ideal elastic-plastic material.

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Influence of the Chloride Attack on the Post-Cracking Behavior of Recycled Steel Fiber Reinforced Concrete

Materials ◽

10.3390/ma14051279 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1279

Author(s):

Cristina Frazão ◽

Joaquim Barros ◽

José Alexandre Bogas

Keyword(s):

Reinforced Concrete ◽

Crack Width ◽

Steel Fiber ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Steel Fiber Reinforced Concrete ◽

Cracking Behavior ◽

Chloride Attack ◽

Recycled Steel ◽

Exposure Conditions

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.

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Durability of Recycled Steel Fiber Reinforced Concrete in Chloride Environment

Fibers ◽

10.3390/fib7120111 ◽

2019 ◽

Vol 7 (12) ◽

pp. 111 ◽

Cited By ~ 3

Author(s):

Cristina Frazão ◽

Joaquim Barros ◽

J. Bogas

Keyword(s):

Reinforced Concrete ◽

Steel Fiber ◽

Chloride Ions ◽

Fiber Reinforced Concrete ◽

Experimental Program ◽

Fiber Reinforced ◽

Steel Fiber Reinforced Concrete ◽

Recycled Steel ◽

Exposure Conditions

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.

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Applications of Steel Fiber Reinforced Concrete in Bridges

IABSE Congress Report ◽

10.2749/222137900796299066 ◽

2000 ◽

Vol 16 (18) ◽

pp. 536-543 ◽

Cited By ~ 1

Author(s):

ChengKui HUANG ◽

ChangDong ZHOU

Keyword(s):

Reinforced Concrete ◽

Steel Fiber ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Steel Fiber Reinforced Concrete

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Acoustic emission by steel fiber reinforced concrete under tensile damage

Materials Testing ◽

10.3139/120.111048 ◽

2017 ◽

Vol 59 (7-8) ◽

pp. 653-660 ◽

Cited By ~ 1

Author(s):

Wang Yan ◽

Ge Lu ◽

Chen Shi Jie ◽

Zhou Li ◽

Zhang Ting Ting

Keyword(s):

Acoustic Emission ◽

Reinforced Concrete ◽

Steel Fiber ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Steel Fiber Reinforced Concrete ◽

Tensile Damage

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On axial compressive behavior of steel fiber reinforced concrete confined by FRP

Advances in Structural Engineering ◽

10.1177/1369433220981658 ◽

2021 ◽

pp. 136943322098165

Author(s):

Hossein Saberi ◽

Farzad Hatami ◽

Alireza Rahai

Keyword(s):

Reinforced Concrete ◽

Experimental Test ◽

Steel Fiber ◽

Experimental Tests ◽

Fiber Reinforced Concrete ◽

Steel Fibers ◽

Test Results ◽

Fiber Reinforced ◽

Steel Fiber Reinforced Concrete ◽

Frp Confinement

In this study, the co-effects of steel fibers and FRP confinement on the concrete behavior under the axial compression load are investigated. Thus, the experimental tests were conducted on 18 steel fiber-reinforced concrete (SFRC) specimens confined by FRP. Moreover, 24 existing experimental test results of FRP-conﬁned specimens tested under axial compression are gathered to compile a reliable database for developing a mathematical model. In the conducted experimental tests, the concrete strength was varied as 26 MPa and 32.5 MPa and the steel fiber content was varied as 0.0%, 1.5%, and 3%. The specimens were confined with one and two layers of glass fiber reinforced polymer (GFRP) sheet. The experimental test results show that simultaneously using the steel fibers and FRP confinement in concrete not only significantly increases the peak strength and ultimate strain of concrete but also solves the issue of sudden failure in the FRP-confined concrete. The simulations confirm that the results of the proposed model are in good agreement with those of experimental tests.

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