The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Jeffery R. Roesler - One of the best experts on this subject based on the ideXlab platform.
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spatial distribution of Synthetic Fibers in concrete with x ray computed tomography
Cement & Concrete Composites, 2014Co-Authors: Amanda Bordelon, Jeffery R. RoeslerAbstract:Abstract The strength and toughness prediction models for fiber-reinforced concrete (FRC) typically assume the spatial distribution of Fibers is uniform. However, non-uniform dispersion can greatly affect the FRC’s mechanical properties. Several techniques have been used in the past to quantify the distribution and orientation of steel Fibers within concrete. For quantifying dispersion of Synthetic Fibers within concrete, a non-destructive technique using X-ray computed tomography (CT) combined with a post-processing image analysis is proposed. Due to X-ray attenuation similarities, the Synthetic Fibers were resolved from air voids by shape and size-based filters. The described approach to determine the actual fiber content within FRC samples was verified to be accurate. The method can be used to determine the individual fiber spatial distribution inside the concrete. As expected, the actual volume fraction of Fibers in a fracture sample was correlated with the measured total fracture energy of the sample.
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Effect of Synthetic Fibers on structural behavior of concrete slabs-on-ground
ACI Materials Journal, 2006Co-Authors: Jeffery R. Roesler, Salah Altoubat, David Lange, Klaus Alexander Rieder, Gregory R. UlreichAbstract:This article studies whether newly developed Synthetic macrofiber can enhance the strength properties of plain and fiber-reinforced concrete slabs-on-ground. The structural behavior of fiber-reinforced concrete slabs under interior and edge loading conditions were tested. The results of the load testing showed that the failure behavior of plain concrete slabs was significantly modified with the addition of Synthetic Fibers, but that the Synthetic Fibers did not change the tensile cracking load of the plain concrete slab. Strain gauges embedded in the concrete slabs indicated the Fibers distributed the load-carrying capacity throughout the slab volume, increasing the concrete slab flexural and ultimate capacities.
Ali Zadhoush - One of the best experts on this subject based on the ideXlab platform.
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a simple review of soil reinforcement by using natural and Synthetic Fibers
Construction and Building Materials, 2012Co-Authors: Sayyed Mahdi Hejazi, Sayyed Mahdi Abtahi, Mohammad Sheikhzadeh, Ali ZadhoushAbstract:Abstract Soil reinforcement is defined as a technique to improve the engineering characteristics of soil. In this way, using natural Fibers to reinforce soil is an old and ancient idea. Consequently, randomly distributed fiber-reinforced soils have recently attracted increasing attention in geotechnical engineering for the second time. The main aim of this paper, therefore, is to review the history, benefits, applications; and possible executive problems of using different types of natural and/or Synthetic Fibers in soil reinforcement through reference to published scientific data. As well, predictive models used for short fiber soil composite will be discussed. On other words, this paper is going to investigate why, how, when; and which Fibers have been used in soil reinforcement projects.
Amanda Bordelon - One of the best experts on this subject based on the ideXlab platform.
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visualizing air voids and Synthetic Fibers from x ray computed tomographic images of concrete
2020 Intermountain Engineering Technology and Computing (IETC), 2020Co-Authors: Amanda Bordelon, Sungmin Hong, Yohann Bearzi, Clement Vachet, Guido GerigAbstract:A challenge in quality control for Synthetic fiber-reinforced concrete is determining the actual spatial distribution of Fibers. This paper presents the first computer algorithm to identify Synthetic macroFibers within hardened concrete that has been scanned in an industrial X-ray computed tomographic scanner. The algorithm can also be used to obtain the spatial distribution of other inclusions such as air voids or steel Fibers as well. Visualization of Synthetic Fibers was the primary focus of this work. The heterogeneous nature of concrete results in a noisy image which makes identifying contrast edge segmentation difficult for to the image processing. In order to identify only Fibers, the air voids touching the Fibers must be identified separately because they are similar in grayscale as the Synthetic Fibers. These air voids are assumed to be spherical in shape, and once identified can be extracted from the remaining fiber-aggregate-cement system. In this study, it was determined that the algorithm works best for straight macroSynthetic Fibers where the pixel resolution is similar or smaller than the diameter of the Fibers and if the Fibers remain straight lines in the 3D matrix.
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spatial distribution of Synthetic Fibers in concrete with x ray computed tomography
Cement & Concrete Composites, 2014Co-Authors: Amanda Bordelon, Jeffery R. RoeslerAbstract:Abstract The strength and toughness prediction models for fiber-reinforced concrete (FRC) typically assume the spatial distribution of Fibers is uniform. However, non-uniform dispersion can greatly affect the FRC’s mechanical properties. Several techniques have been used in the past to quantify the distribution and orientation of steel Fibers within concrete. For quantifying dispersion of Synthetic Fibers within concrete, a non-destructive technique using X-ray computed tomography (CT) combined with a post-processing image analysis is proposed. Due to X-ray attenuation similarities, the Synthetic Fibers were resolved from air voids by shape and size-based filters. The described approach to determine the actual fiber content within FRC samples was verified to be accurate. The method can be used to determine the individual fiber spatial distribution inside the concrete. As expected, the actual volume fraction of Fibers in a fracture sample was correlated with the measured total fracture energy of the sample.
Sayyed Mahdi Hejazi - One of the best experts on this subject based on the ideXlab platform.
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a simple review of soil reinforcement by using natural and Synthetic Fibers
Construction and Building Materials, 2012Co-Authors: Sayyed Mahdi Hejazi, Sayyed Mahdi Abtahi, Mohammad Sheikhzadeh, Ali ZadhoushAbstract:Abstract Soil reinforcement is defined as a technique to improve the engineering characteristics of soil. In this way, using natural Fibers to reinforce soil is an old and ancient idea. Consequently, randomly distributed fiber-reinforced soils have recently attracted increasing attention in geotechnical engineering for the second time. The main aim of this paper, therefore, is to review the history, benefits, applications; and possible executive problems of using different types of natural and/or Synthetic Fibers in soil reinforcement through reference to published scientific data. As well, predictive models used for short fiber soil composite will be discussed. On other words, this paper is going to investigate why, how, when; and which Fibers have been used in soil reinforcement projects.
Hyun Oh Shin - One of the best experts on this subject based on the ideXlab platform.
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enhancing mechanical properties of asphalt concrete using Synthetic Fibers
Construction and Building Materials, 2018Co-Authors: Minjae Kim, Soonho Kim, Doo Yeol Yoo, Hyun Oh ShinAbstract:Abstract This study aims to find the optimal type and concentration of Fibers necessary to reinforce and enhance the mechanical properties of asphalt concrete. Four types of Fibers: polypropylene (PP) and polyester (Pe) Fibers with a length of 6 mm, nylon (Ny) and carbon (C) Fibers, all with a length of 12 mm, were incorporated into asphalt at 0.5% and 1.0% of volume content, respectively. Six test parameters were examined for each variable to investigate the influence of the fiber type and content: the Marshall stability, porosity, indirect tensile strength, moisture susceptibility, dynamic stability, and flexural performances. Furthermore, scanning electron microscopy (SEM) images were used to accurately analyze the test results. The test results show that most of the fiber-reinforced asphalt concretes provided significantly improved mechanical performances compared to the plain asphalt concrete specimen. The optimal fiber type was the Ny fiber for every test parameter, and the optimum volume content of the Ny fiber was 1.0%, except for the case of the dynamic stability.
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effect of steel and Synthetic Fibers on flexural behavior of high strength concrete beams reinforced with frp bars
Composites Part B-engineering, 2012Co-Authors: Junmo Yang, Kyung Hwan Min, Hyun Oh Shin, Young Soo YoonAbstract:Abstract Six high-strength concrete beam specimens reinforced with fiber-reinforced polymer (FRP) bars were constructed and tested. Three of the beams were reinforced with carbon FRP (CFRP) bars and the other three beams were reinforced with glass FRP (GFRP) bars as flexural reinforcements. Steel Fibers and polyolefin Synthetic Fibers were used as reinforcing discrete Fibers. An investigation was performed on the influence of the addition of Fibers on load-carrying capacity, cracking response, and ductility. In addition, the test results were compared with the predictions for the ultimate flexural moment. The addition of Fibers increased the first-cracking load, ultimate flexural strength, and ductility, and also mitigated the large crack width of the FRP bar-reinforced concrete beams.
