scholarly journals Electrical Material Properties of Carbon Reinforced Concrete

Electronics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 857
Author(s):  
Sebastian Hegler ◽  
Patrick Seiler ◽  
Max Dinkelaker ◽  
Frank Schladitz ◽  
Dirk Plettemeier
Keyword(s):  
Reinforced Concrete ◽  
Material Properties ◽  
Fiber Reinforced Concrete ◽  
Radio Propagation ◽  
Radio Communication ◽  
Metallic Wire ◽  
Rf Propagation ◽  
Wire Screen ◽  
Reinforcement Material ◽  
Screen Model

Carbon fiber reinforced concrete is poised to be the building material of the future. We present a study to quantify the influence of this novel reinforcement material on RF propagation in the range from 0.4 to 67 GHz. The measured attenuation effects of the reinforcement material are explained and quantified using a metallic wire screen model. It can be used to as a simple model of the material’s influence in radio propagation scenarios. For reference and completeness, data on the complex dielectric permittivity of the investigated concrete brand is also included. The production process of the concrete samples used for the measurements is documented, facilitating comparability and reproducibility. Finally, implications for current and future radio communication applications are outlined.

Steel fiber reinforced concrete: A review of its material properties and usage in tunnel lining

Structures ◽  
2021 ◽  
Vol 34 ◽  
pp. 1080-1098
Author(s):  
Xiuling Wang ◽  
Feifei Fan ◽  
Jinxing Lai ◽  
Yongli Xie
Keyword(s):  
Reinforced Concrete ◽  
Material Properties ◽  
Steel Fiber ◽  
Tunnel Lining ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete

scholarly journals Flexural Behavior of Steel Fiber Reinforced Concrete Beams: Probabilistic Numerical Modeling and Sensitivity Analysis

2021 ◽  
Vol 11 (20) ◽  
pp. 9591
Author(s):  
Predrag Blagojević ◽  
Nikola Blagojević ◽  
Danijel Kukaras
Keyword(s):  
Sensitivity Analysis ◽  
Reinforced Concrete ◽  
Material Properties ◽  
Probabilistic Models ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Flexural Behavior ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete

One of the principle issues concerning the practical application of steel fiber reinforced concrete (SFRC) is the uncertainty related to its structural behavior, primarily caused by the partially random distribution and orientation of steel fibers in SFRC structural elements. This paper aims to provide a better understanding of how the variance of material properties of the SFRC affects the flexural behavior of SFRC beams. First, a distributed plasticity fiber finite element model of beam flexural behavior is proposed and validated. Then, probability distributions of selected material properties are defined based on existing probabilistic models and experimental results from the literature. Finally, a variance-based sensitivity analysis is performed using Sobol’ indices to identify uncertainties in material properties that contribute most to the uncertainties related to three characteristic points of a beam’s flexural behavior: first crack, yield, and collapse point. Sensitivity analysis is performed by surrogating the numerical model using polynomial chaos expansion. The variance in residual tensile strength is identified as the main contributor to the variance in the flexural behavior of an SFRC beam used in the case study.

scholarly journals Estimating the Tensile Strength of Ultrahigh-Performance Fiber-Reinforced Concrete Beams

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
In-Hwan Yang ◽  
Changbin Joh ◽  
The Quang Bui
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Material Properties ◽  
Steel Fiber ◽  
Tensile Behavior ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Experimental Result ◽  
Fiber Reinforced ◽  
The Moment

The tensile behavior of ultrahigh-performance fiber-reinforced concrete (UHPFRC) depends on the dispersion and orientation of steel fibers within the concrete matrix. The uneven dispersion of randomly oriented steel fibers in concrete may cause differences in the tensile behavior between material testing specimens and beams. Therefore, in this study, the tensile behavior was investigated by fitting the analysis result of the moment-curvature curve to the experimental result of a UHPFRC beam. To this end, three UHPFRC mixtures with different compressive strengths were fabricated to test the material properties and flexural behavior of UHPFRC beams. Both a single type of steel fiber and a combination of steel fiber types were used with volume fractions of 1.0% and 1.5%, respectively, in the three mixtures. Based on the design recommendations, the material properties of UHPFRC were modeled. The results ultimately show that by fitting the analysis results to the experimental results of the moment-curvature curves, the tensile strength of UHPFRC beams can be reasonably estimated.

Material Properties of Synthetic Fiber–Reinforced Concrete under Freeze-Thaw Conditions

2018 ◽  
Vol 30 (6) ◽  
pp. 04018090 ◽  
Author(s):  
Fouad T. Al Rikabi ◽  
Shad M. Sargand ◽  
Issam Khoury ◽  
Husam H. Hussein
Keyword(s):  
Reinforced Concrete ◽  
Material Properties ◽  
Fiber Reinforced Concrete ◽  
Synthetic Fiber ◽  
Fiber Reinforced ◽  
Freeze Thaw

scholarly journals Comparison of material properties of steel fiber reinforced concrete with two types of steel fiber

2019 ◽  
Vol 549 ◽  
pp. 012039 ◽  
Author(s):  
Z Marcalíková ◽  
L Procházka ◽  
M Pešata ◽  
J Boháčová ◽  
R Čajka
Keyword(s):  
Reinforced Concrete ◽  
Material Properties ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete

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.    

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