Improving the Tensile Energy Absorption of High Strength Natural Fiber Reinforced Concrete with Fly-Ash for Bridge Girders

2018 ◽  
Vol 765 ◽  
pp. 335-342 ◽  
Author(s):  
Umair Aziz Khan ◽  
Hafiz Muhammad Jahanzaib ◽  
Mehran Khan ◽  
Majid Ali
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Bridge Girders ◽  
Fiber Reinforced ◽  
Absorbed Energy ◽  
Strength Concrete ◽  
The Impact ◽  
Coconut Fibers

Nowadays high strength concrete is used in bridge girders due to its improved mechanical properties. However, its behavior is relatively more brittle compared to that of normal strength concrete. Due to the highest toughness among natural fibers, coconut fibers are chosen. In this work, the impact of different fly-ash contents on tensile absorbed energy of high strength coconut fiber reinforced concrete (CFRC-SF) will be investigated for structural application. The mix design ratio of CFRC-SF is 1:2:2 (cement: sand: aggregate) with a water-cement ratio of 0.50 and silica-fume content of 15%. The coconut fibers of 5 cm length and content of 2%, by cement mass, are added. To prepare CFRC-SF5, CFRC-SF10 and CFRC-SF15, different fly-ash contents of 5%, 10% and 15%, respectively, (by cement mass) are added. For determination of splitting-tensile strength, pre-crack/ absorbed energy after crack and toughness indices, cylinders of size 100 mm diameter and 200 mm height are cast and are tested under splitting-tensile load as per ASTM standard. The tensile absorbed energy of CFRC-SF is increased up to 10% fly-ash content. Further study on durability of CFRC-SF is suggested due to the biological nature of coconut fibers.

Study on the Dynamic Performance of Steel Fiber Reinforced Concrete in SHPB Experiment

2013 ◽  
Vol 700 ◽  
pp. 140-143 ◽  
Author(s):  
Li Li Huang ◽  
Wei Shi
Keyword(s):  
Reinforced Concrete ◽  
High Strength Concrete ◽  
Steel Fiber ◽  
Dynamic Performance ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Strength Concrete ◽  
Shpb Test

It is important to enhance the ductility of high strength concrete (HSC), and one possible direction is to use steel fibers reinforced, named steel fiber reinforced high strength concrete (SFRHSC).In this paper, The crack characteristics of steel fiber reinforced concrete is investigated in the SHPB test. The incident wave and transmission wave varying with the time have been obtained by SHPB experiment. The relationship curve for stress and strain of material concrete has also been obtained.

The effects of fibers on the confinement models for concrete columns

2002 ◽  
Vol 29 (5) ◽  
pp. 742-750 ◽  
Author(s):  
Giuseppe Campione
Keyword(s):  
Reinforced Concrete ◽  
High Strength Concrete ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Stress Strain ◽  
Concrete Core ◽  
Strength Concrete ◽  
Transverse Steel

A mathematical model is developed to express the stress–strain relationships in compression of fiber-reinforced concrete (FRC) columns for both normal- and high-strength concrete, with and without conventional steel reinforcement. This model allows one to determine the maximum strength and strain capacity by determining the effective concrete core of the confining devices at rupture. Analytical expressions are also given for the ultimate load corresponding to the complete formation of the concrete failure plane. The proposed model incorporates the most relevant parameters of confinement, i.e., type of confinement, volumetric ratio, spacing, yielding strength, shape of the member cross section, type of fiber (length, diameter, shape), and fiber volume. The model has been verified against data obtained from concentric compressive tests on concrete specimens reinforced with transverse steel and fibers.Key words: high-strength concrete, fiber-reinforced concrete, lateral reinforcement, stress–strain curves.

Failure Behavior and Numerical Simulation of the Local Damage of Ultra High Strength Fiber Reinforced Concrete Subjected to High Velocity Impact

2014 ◽  
Vol 566 ◽  
pp. 205-210 ◽  
Author(s):  
Seong Bong Cheon ◽  
Masuhiro Beppu ◽  
Yoshimi Sonoda ◽  
Masaharu Itoh
Keyword(s):  
Reinforced Concrete ◽  
High Speed ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Failure Behavior ◽  
Local Damage ◽  
Fiber Reinforced ◽  
Concrete Plates ◽  
High Strength Fiber ◽  
The Impact

This study presents the local damage of ultra high strength fiber reinforced concrete plates. Impact test of the reinforced concrete plates using two different short fibers are conducted to examine the failure behavior and impact resistant performance. Material models are discussed and proposed by simulating the high speed tri-compressive and uni-tensile tests. Numerical simulations of the impact tests are carried out. Numerical results show good agreements with the test results.

Effect of combined drink cans and steel fibers on the impact resistance and mechanical properties of concrete

2020 ◽  
Vol 14 (2) ◽  
pp. 6734-6742
Author(s):  
A. Syamsir ◽  
S. M. Mubin ◽  
N. M. Nor ◽  
V. Anggraini ◽  
S. Nagappan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Impact Resistance ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Indirect Tensile ◽  
The Impact

This study investigated the combine effect of 0.2 % drink cans and steel fibers with volume fractions of 0%, 0.5%, 1%, 1.5%, 2%, 2.5% and 3% to the mechanical properties and impact resistance of concrete. Hooked-end steel fiber with 30 mm and 0.75 mm length and diameter, respectively was selected for this study.  The drinks cans fiber were twisted manually in order to increase friction between fiber and concrete. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the strength performance of concrete, especially the compressive strength, flexural strength and indirect tensile strength. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the compressive strength, flexural strength and indirect tensile strength by 2.3, 7, and 2 times as compare to batch 1, respectively. Moreover, the impact resistance of fiber reinforced concrete has increase by 7 times as compared to non-fiber concretes. Moreover, the impact resistance of fiber reinforced concrete consistently gave better results as compared to non-fiber concretes. The fiber reinforced concrete turned more ductile as the dosage of fibers was increased and ductility started to decrease slightly after optimum fiber dosage was reached. It was found that concrete with combination of 2% steel and 0.2% drink cans fibers showed the highest compressive, split tensile, flexural as well as impact strength.    

scholarly journals Resistance of an Optimized Ultra-High Performance Fiber Reinforced Concrete to Projectile Impact

Buildings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 63
Author(s):  
Anna L. Mina ◽  
Michael F. Petrou ◽  
Konstantinos G. Trezos
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Depth Of Penetration ◽  
Projectile Impact ◽  
High Performance Fiber

The scope of this paper is to investigate the performance of ultra-high performance fiber reinforced concrete (UHPFRC) concrete slabs, under projectile impact. Mixture performance under impact loading was examined using bullets with 7.62 mm diameter and initial velocity 800 m/s. The UHPFRC, used in this study, consists of a combination of steel fibers of two lengths: 6 mm and 13 mm with the same diameter of 0.16 mm. Six composition mixtures were tested, four UHPFRC, one ultra-high performance concrete (UHPC), without steel fibers, and high strength concrete (HSC). Slabs with thicknesses of 15, 30, 50, and 70 mm were produced and subjected to real shotgun fire in the field. Penetration depth, material volume loss, and crater diameter were measured and analyzed. The test results show that the mixture with a combination of 3% 6 mm and 3% of 13 mm length of steel fibers exhibited the best resistance to projectile impact and only the slabs with 15 mm thickness had perforation. Empirical models that predict the depth of penetration were compared with the experimental results. This material can be used as an overlay to buildings or to construct small precast structures.

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