Methods of Evaluating the Performance of Fiber-Reinforced Concrete

1990 ◽  
Vol 211 ◽  
Author(s):  
Colin D. Johnston
Keyword(s):  
Reinforced Concrete ◽  
Fiber Reinforced Concrete ◽  
Material Behavior ◽  
Fiber Reinforced ◽  
Thermal Change ◽  
Advantages And Disadvantages ◽  
Concrete Quality ◽  
Predetermined Level ◽  
Loading Tests ◽  
Crack Widths

AbstractThree of the most important properties of fiber-reinforced concrete (FRC) are strength, toughness and resistance to cracking. The various methods of evaluating them are compared in terms of underlying rationale, ability to characterize composite material behavior in a readily understandable manner minimally affected by testing variables, and suitability for routine use in specifying and controlling concrete quality. The scope includes dynamic loading tests, slow-rate (static) loading tests, and tests to evaluate cracking induced directly by load or indirectly by restraint during shrinkage or thermal change.Consideration of the advantages and disadvantages of the various alternatives shows that slow flexure testing in accordance with the rationale developed by the writer and incorporated into ASTM standard C1018 effectively characterizes the FRC in terms of first-crack strength, toughness, and residual strength after first crack up to any predetermined level of serviceability expressed in terms of maximum permissible deflection. Although not part of the standard, resistance to cracking under load may also be assessed by measuring crack widths at appropriate deflections.

A comparative study of flexural and shear behavior of ultra-high-performance fiber-reinforced concrete beams

2019 ◽  
Vol 22 (7) ◽  
pp. 1727-1738 ◽  
Author(s):  
Masoud Pourbaba ◽  
Hamed Sadaghian ◽  
Amir Mirmiran
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Concrete Beams ◽  
Shear Behavior ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced ◽  
High Performance Fiber ◽  
Loading Tests ◽  
Normal Strength

In this research, the flexural and shear behavior of five locally developed ultra-high-performance fiber-reinforced concrete beams was experimentally investigated. Four-point loading tests were carried out on concrete specimens which were further compared with five normal-strength concrete beams constructed at the laboratory. The objective of this study is to assess the flexural and shear behavior of ultra-high-performance fiber-reinforced concrete beams and compare them with that of normal-strength beams and available equations in the literature. Results indicate underestimation of shear (up to 2.71 times) and moment capacities (minimum 1.27 times, maximum 3.55 times) by most of the equations in beams with low-reinforcement ratios. Finally, results reveal that the experimental flexural and shear capacities of ultra-high-performance fiber-reinforced concrete specimens are up to 3.5 times greater than their normal-strength counterpart specimens.

scholarly journals Fiber Interfacial Transition Zone Concept for Steel Fiber-Reinforced Concrete by SEM Observation

2021 ◽  
Vol 19 (4) ◽  
pp. 294-307
Author(s):  
Ehsan Adili ◽  
Ali Kheyroddin
Keyword(s):  
Reinforced Concrete ◽  
Transition Zone ◽  
Sem Analysis ◽  
Interfacial Transition Zone ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Types ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Crack Widths

Fiber-reinforced concrete (FRC), which has become quite popular in recent years, improves many of concrete’s mechanical properties. It uses fibers discretely and is utilized in different structures. This paper proposes, between steel fibers and concrete, a fiber interfacial transition zone (FITZ) which is the most vulnerable part of steel FRC (SFRC) because it has a high cracking and microcracking potential due to fiber-concrete separation. In the prepared specimens, steel fibers were added to concrete in hooked and twisted forms, the SFRC microstructure was studied in both cases under a scanning electron microscope (SEM), and the related images were compared as secondary electron (SE) images. The SEM analysis showed highly precise images of the cracks and their microstructures in the FITZ and lab results show that the newly defined FITZ illustrates the cracking patterns well for both fiber types. Because twisted fibers have cracking angles and larger contact surfaces, the concrete-fiber bond is increased and the related crack widths decrease considerably. A comparison of the crack widths showed that those in the FITZ of specimens with twisted fibers decreased by a factor of approximately seven compared to those with hooked fibers.

scholarly journals Economic viability of ultra high-performance fiber reinforced concrete in prestressed concrete wind towers to support a 5 MW turbine

2017 ◽  
Vol 10 (1) ◽  
pp. 1-14 ◽  
Author(s):  
P. V. C. N. GAMA ◽  
T. N. BITTENCOURT
Keyword(s):  
Reinforced Concrete ◽  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Fiber Reinforced Concrete ◽  
Economic Viability ◽  
Fiber Reinforced ◽  
Limit States ◽  
Advantages And Disadvantages ◽  
High Performance Fiber

Abstract The Ultra-High Performance Fiber-Reinforced Concrete is a material with remarkable mechanical properties and durability when compared to conventional and high performance concrete, which allows its use even without the reinforcement. This paper proposes the design of prestressed towers for a 5 MW turbine, through regulatory provisions and the limit states method, with UHPFRC and the concrete class C50, comparing the differences obtained in the design by parametric analysis, giving the advantages and disadvantages of using this new type of concrete. Important considerations, simplifications and notes are made to the calculation process, as well as in obtaining the prestressing and passive longitudinal and passive transverse reinforcement, highlighting the shear strength of annular sections comparing a model proposed here with recent experimental results present in the literature, which was obtained good agreement. In the end, it is estimated a first value within the constraints here made to ensure the economic viability of the use of UHPFRC in a 100 m prestressed wind tower with a 5 MW turbine.

scholarly journals Application of fiber-reinforced concrete in high-rise construction

2020 ◽  
Vol 164 ◽  
pp. 02005
Author(s):  
Aleksandr Ischenko ◽  
Anastasia Borisova
Keyword(s):  
Reinforced Concrete ◽  
Construction Material ◽  
Residential Building ◽  
Active Regions ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
High Rise ◽  
Advantages And Disadvantages

In this research, we study the use of fiber-reinforced concrete, including steel fiber-reinforced concrete in the construction of outrigger floors of a high-rise building. The definition and classification of fiber-reinforced concrete as a construction material, the methodology for calculating high-rise buildings using fiber-reinforced concrete, the advantages and disadvantages of this composite material, and the specifics of its use are formulated. The domestic and foreign experience in use of fiber-reinforced concrete is analyzed. The rationale for its use on the experience of construction of residential building in seismically active regions is given. A comparative analysis of concrete and fiber concrete use in the outrigger floors’ construction is carried out.

scholarly journals Simulating Fiber-Reinforced Concrete Mechanical Performance Using CT-Based Fiber Orientation Data

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 717 ◽  
Author(s):  
Vladimir Buljak ◽  
Tyler Oesch ◽  
Giovanni Bruno
Keyword(s):  
Reinforced Concrete ◽  
Fiber Orientation ◽  
Control Experiment ◽  
Mechanical Performance ◽  
Damage Model ◽  
Fiber Reinforced Concrete ◽  
Material Behavior ◽  
Bending Test ◽  
Structural Level ◽  
Fiber Reinforced

The main hindrance to realistic models of fiber-reinforced concrete (FRC) is the local materials property variation, which does not yet reliably allow simulations at the structural level. The idea presented in this paper makes use of an existing constitutive model, but resolves the problem of localized material variation through X-ray computed tomography (CT)-based pre-processing. First, a three-point bending test of a notched beam is considered, where pre-test fiber orientations are measured using CT. A numerical model is then built with the zone subjected to progressive damage, modeled using an orthotropic damage model. To each of the finite elements within this zone, a local coordinate system is assigned, with its longitudinal direction defined by local fiber orientations. Second, the parameters of the constitutive damage model are determined through inverse analysis using load-displacement data obtained from the test. These parameters are considered to clearly explain the material behavior for any arbitrary external action and fiber orientation, for the same geometrical properties and volumetric ratio of fibers. Third, the effectiveness of the resulting model is demonstrated using a second, “control” experiment. The results of the “control” experiment analyzed in this research compare well with the model results. The ultimate strength was predicted with an error of about 6%, while the work-of-load was predicted within 4%. It demonstrates the potential of this method for accurately predicting the mechanical performance of FRC components.

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.    

Fiber-reinforced concrete in precast concrete applications: Research leads to innovative products

PCI Journal ◽  
2012 ◽  
Vol 57 (3) ◽  
pp. 33-46 ◽  
Author(s):  
Nemkumar Banthia ◽  
Vivek Bindiganavile ◽  
John Jones ◽  
Jeff Novak
Keyword(s):  
Reinforced Concrete ◽  
Precast Concrete ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Innovative Products
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