The Experts below are selected from a list of 4821 Experts worldwide ranked by ideXlab platform
M Garcia - One of the best experts on this subject based on the ideXlab platform.
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Wood–plastics composites with better fire retardancy and Durability Performance
Composites Part A-applied Science and Manufacturing, 2009Co-Authors: M Garcia, I�aki Garmendia, J. Hidalgo, Javier García-jacaAbstract:Abstract This study concerns the preparation and study of wood–plastic composites (WPCs). The matrix used was high density polyethylene. Results showed that the addition of wood fibres increased mechanical properties (tensile, flexural and compression) of the neat plastic remarkably. Additives such as fire retardants and light stabilizers were added to improve properties like fire retardancy and Durability Performance. The addition of fire retardants could lead to auto-extinguishing materials when ammonium polyphosphate or aluminium hydroxide were used. Outdoor Durability depended on both the light stabilizer and the fire retardant added to the formulation. The fire retardant worsened the outdoor Durability. However, stabilized fire retarded-WPCs showed much lower fading than non-stabilized non-fire retarded composites and several industrial samples. Stabilized composites with aluminium hydroxide as fire retardant showed the best overall results with a fading degree even lower than the stabilized non-fire retarded composite.
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wood plastics composites with better fire retardancy and Durability Performance
Composites Part A-applied Science and Manufacturing, 2009Co-Authors: M Garcia, I�aki Garmendia, J. Hidalgo, J GarciajacaAbstract:Abstract This study concerns the preparation and study of wood–plastic composites (WPCs). The matrix used was high density polyethylene. Results showed that the addition of wood fibres increased mechanical properties (tensile, flexural and compression) of the neat plastic remarkably. Additives such as fire retardants and light stabilizers were added to improve properties like fire retardancy and Durability Performance. The addition of fire retardants could lead to auto-extinguishing materials when ammonium polyphosphate or aluminium hydroxide were used. Outdoor Durability depended on both the light stabilizer and the fire retardant added to the formulation. The fire retardant worsened the outdoor Durability. However, stabilized fire retarded-WPCs showed much lower fading than non-stabilized non-fire retarded composites and several industrial samples. Stabilized composites with aluminium hydroxide as fire retardant showed the best overall results with a fading degree even lower than the stabilized non-fire retarded composite.
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Wood-plastics composites with better fire retardancy and Durability Performance
Composites Part A: Applied Science and Manufacturing, 2009Co-Authors: M Garcia, I�aki Garmendia, J. Hidalgo, Javier García-jacaAbstract:This study concerns the preparation and study of wood-plastic composites (WPCs). The matrix used was high density polyethylene. Results showed that the addition of wood fibres increased mechanical properties (tensile, flexural and compression) of the neat plastic remarkably. Additives such as fire retardants and light stabilizers were added to improve properties like fire retardancy and Durability Performance. The addition of fire retardants could lead to auto-extinguishing materials when ammonium polyphosphate or aluminium hydroxide were used. Outdoor Durability depended on both the light stabilizer and the fire retardant added to the formulation. The fire retardant worsened the outdoor Durability. However, stabilized fire retarded-WPCs showed much lower fading than non-stabilized non-fire retarded composites and several industrial samples. Stabilized composites with aluminium hydroxide as fire retardant showed the best overall results with a fading degree even lower than the stabilized non-fire retarded composite. © 2009 Elsevier Ltd. All rights reserved.
Julio F. Davalos - One of the best experts on this subject based on the ideXlab platform.
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accelerated aging tests for evaluations of Durability Performance of frp reinforcing bars for concrete structures
Composite Structures, 2007Co-Authors: Yi Chen, Julio F. DavalosAbstract:Abstract This paper presents accelerated aging test results of a Durability study on fiber-reinforced polymer (FRP) reinforcing bars for concrete structures. Bare FRP bars and also bars embedded in concrete, primarily for glass composites, were exposed to five different solutions: water, two types of simulated alkaline pore solutions of normal and high Performance concrete, saline solution, and combined alkaline solution with chloride ions. The aging was accelerated by using elevated temperatures. Wetting and drying and freezing and thawing cycles were combined with some solutions to simulate the coupling effects as expected in field conditions. The tensile strength and interlaminar shear strength of FRP bars were determined before and after exposure, and were considered to be measures of Durability Performance of the specimens. In addition, pullout tests were conducted to investigate the effects of accelerated exposure on the Durability of bond strength between FRP bars and concrete. The results showed that when exposed to simulated environments significant strength loss resulted from the accelerated exposure of both bare and embedded GFRP bars, including bond strength, especially for solutions at 60 °C. In contrast carbon fiber-reinforced polymer (CFRP) bars displayed excellent Durability Performance. For GFRP bars, continuous immersion resulted in greater degradation than exposure to wetting and drying cycling. In contrast, freezing and thawing cycling combined with solutions had little degradation effects on the FRP bars.
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Accelerated aging tests for evaluations of Durability Performance of FRP reinforcing bars for concrete structures
Composite Structures, 2007Co-Authors: Yi Chen, Julio F. Davalos, Indrajit Ray, Hyeong Yeol KimAbstract:This paper presents accelerated aging test results of a Durability study on fiber-reinforced polymer (FRP) reinforcing bars for concrete structures. Bare FRP bars and also bars embedded in concrete, primarily for glass composites, were exposed to five different solutions: water, two types of simulated alkaline pore solutions of normal and high Performance concrete, saline solution, and combined alkaline solution with chloride ions. The aging was accelerated by using elevated temperatures. Wetting and drying and freezing and thawing cycles were combined with some solutions to simulate the coupling effects as expected in field conditions. The tensile strength and interlaminar shear strength of FRP bars were determined before and after exposure, and were considered to be measures of Durability Performance of the specimens. In addition, pullout tests were conducted to investigate the effects of accelerated exposure on the Durability of bond strength between FRP bars and concrete. The results showed that when exposed to simulated environments significant strength loss resulted from the accelerated exposure of both bare and embedded GFRP bars, including bond strength, especially for solutions at 60 °C. In contrast carbon fiber-reinforced polymer (CFRP) bars displayed excellent Durability Performance. For GFRP bars, continuous immersion resulted in greater degradation than exposure to wetting and drying cycling. In contrast, freezing and thawing cycling combined with solutions had little degradation effects on the FRP bars. © 2005 Elsevier Ltd. All rights reserved.
Yi Chen - One of the best experts on this subject based on the ideXlab platform.
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accelerated aging tests for evaluations of Durability Performance of frp reinforcing bars for concrete structures
Composite Structures, 2007Co-Authors: Yi Chen, Julio F. DavalosAbstract:Abstract This paper presents accelerated aging test results of a Durability study on fiber-reinforced polymer (FRP) reinforcing bars for concrete structures. Bare FRP bars and also bars embedded in concrete, primarily for glass composites, were exposed to five different solutions: water, two types of simulated alkaline pore solutions of normal and high Performance concrete, saline solution, and combined alkaline solution with chloride ions. The aging was accelerated by using elevated temperatures. Wetting and drying and freezing and thawing cycles were combined with some solutions to simulate the coupling effects as expected in field conditions. The tensile strength and interlaminar shear strength of FRP bars were determined before and after exposure, and were considered to be measures of Durability Performance of the specimens. In addition, pullout tests were conducted to investigate the effects of accelerated exposure on the Durability of bond strength between FRP bars and concrete. The results showed that when exposed to simulated environments significant strength loss resulted from the accelerated exposure of both bare and embedded GFRP bars, including bond strength, especially for solutions at 60 °C. In contrast carbon fiber-reinforced polymer (CFRP) bars displayed excellent Durability Performance. For GFRP bars, continuous immersion resulted in greater degradation than exposure to wetting and drying cycling. In contrast, freezing and thawing cycling combined with solutions had little degradation effects on the FRP bars.
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Accelerated aging tests for evaluations of Durability Performance of FRP reinforcing bars for concrete structures
Composite Structures, 2007Co-Authors: Yi Chen, Julio F. Davalos, Indrajit Ray, Hyeong Yeol KimAbstract:This paper presents accelerated aging test results of a Durability study on fiber-reinforced polymer (FRP) reinforcing bars for concrete structures. Bare FRP bars and also bars embedded in concrete, primarily for glass composites, were exposed to five different solutions: water, two types of simulated alkaline pore solutions of normal and high Performance concrete, saline solution, and combined alkaline solution with chloride ions. The aging was accelerated by using elevated temperatures. Wetting and drying and freezing and thawing cycles were combined with some solutions to simulate the coupling effects as expected in field conditions. The tensile strength and interlaminar shear strength of FRP bars were determined before and after exposure, and were considered to be measures of Durability Performance of the specimens. In addition, pullout tests were conducted to investigate the effects of accelerated exposure on the Durability of bond strength between FRP bars and concrete. The results showed that when exposed to simulated environments significant strength loss resulted from the accelerated exposure of both bare and embedded GFRP bars, including bond strength, especially for solutions at 60 °C. In contrast carbon fiber-reinforced polymer (CFRP) bars displayed excellent Durability Performance. For GFRP bars, continuous immersion resulted in greater degradation than exposure to wetting and drying cycling. In contrast, freezing and thawing cycling combined with solutions had little degradation effects on the FRP bars. © 2005 Elsevier Ltd. All rights reserved.
Javier García-jaca - One of the best experts on this subject based on the ideXlab platform.
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Wood–plastics composites with better fire retardancy and Durability Performance
Composites Part A-applied Science and Manufacturing, 2009Co-Authors: M Garcia, I�aki Garmendia, J. Hidalgo, Javier García-jacaAbstract:Abstract This study concerns the preparation and study of wood–plastic composites (WPCs). The matrix used was high density polyethylene. Results showed that the addition of wood fibres increased mechanical properties (tensile, flexural and compression) of the neat plastic remarkably. Additives such as fire retardants and light stabilizers were added to improve properties like fire retardancy and Durability Performance. The addition of fire retardants could lead to auto-extinguishing materials when ammonium polyphosphate or aluminium hydroxide were used. Outdoor Durability depended on both the light stabilizer and the fire retardant added to the formulation. The fire retardant worsened the outdoor Durability. However, stabilized fire retarded-WPCs showed much lower fading than non-stabilized non-fire retarded composites and several industrial samples. Stabilized composites with aluminium hydroxide as fire retardant showed the best overall results with a fading degree even lower than the stabilized non-fire retarded composite.
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Wood-plastics composites with better fire retardancy and Durability Performance
Composites Part A: Applied Science and Manufacturing, 2009Co-Authors: M Garcia, I�aki Garmendia, J. Hidalgo, Javier García-jacaAbstract:This study concerns the preparation and study of wood-plastic composites (WPCs). The matrix used was high density polyethylene. Results showed that the addition of wood fibres increased mechanical properties (tensile, flexural and compression) of the neat plastic remarkably. Additives such as fire retardants and light stabilizers were added to improve properties like fire retardancy and Durability Performance. The addition of fire retardants could lead to auto-extinguishing materials when ammonium polyphosphate or aluminium hydroxide were used. Outdoor Durability depended on both the light stabilizer and the fire retardant added to the formulation. The fire retardant worsened the outdoor Durability. However, stabilized fire retarded-WPCs showed much lower fading than non-stabilized non-fire retarded composites and several industrial samples. Stabilized composites with aluminium hydroxide as fire retardant showed the best overall results with a fading degree even lower than the stabilized non-fire retarded composite. © 2009 Elsevier Ltd. All rights reserved.
Brahim Benmokrane - One of the best experts on this subject based on the ideXlab platform.
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Durability Performance and long-term prediction models of sand-coated basalt FRP bars
Composites Part B-engineering, 2019Co-Authors: Hamdy M. Mohamed, Brahim Benmokrane, Adel Elsafty, Omar ChaallalAbstract:Abstract Basalt-fiber-reinforced polymer (BFRP) bars are expected to provide benefits that are comparable or superior to other types of FRP while being significantly cost-effective. However, extensive investigations are needed to evaluate the long-term characteristics and Durability Performance of these bars. This article presents an experimental study that investigated the physical, mechanical, microstructural, and Durability characteristics of newly developed basalt-fiber-reinforced polymer (BFRP) bars. The physical, mechanical properties and microstructural characteristics were evaluated first on the unconditioned BFRP bars. The Durability Performance of the BFRP bars was then assessed by conducting the mechanical tests, such as transverse-shear test, flexural test, and interlaminar-shear test, on the specimens after different exposure periods (1000; 3000; and 5000 h) at 60 °C. Thereafter, the BFRP bar properties were assessed and compared with the values obtained on the unconditioned specimens. The test parameter was conditioning time (1000; 3000; and 5000 h). The test results revealed that the unconditioned BFRP bars had the best physical properties. On the other hand, the long-term Durability Performance revealed that the transverse shear-strength, flexural-strength, and interlaminar shear-strength retention were decreased by 12%, 19%, and 21%, respectively.
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Effect of applied sustained load and severe environments on Durability Performance of carbon-fiber composite cables
Journal of Composite Materials, 2018Co-Authors: Hamdy M. Mohamed, Brahim Benmokrane, Adel ElsaftyAbstract:The research work reported in this paper involves investigation of the mechanical and Durability Performance of unstressed and stressed Tokyo Rope carbon-fiber composite cables for prestressing app...
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Durability Performance and service life of cfcc tendons exposed to elevated temperature and alkaline environment
Journal of Composites for Construction, 2016Co-Authors: Brahim Benmokrane, Hamdy M. Mohamed, Mathieu Robert, Adel ElsaftyAbstract:AbstractThis paper presents the physical, mechanical, and Durability characterization of Tokyo Rope carbon fiber composite cables (CFCCs). Specimens were exposed to and alkaline solution (12.8 pH) for 1,000, 3,000, 5,000, and 7,000 h at different elevated exposure temperatures (22, 40, 50, and 60°C) to yield a simulated acceleration of the effect of a concrete environment. The Durability Performance of the Tokyo Rope CFCC tendons was assessed by conducting tensile tests on the specimens after different exposure periods. In addition, the microstructure of the CFCCs—both conditioned and unconditioned specimens—was investigated with scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) to assess any changes or degradation. The preexposure and postexposure tensile strengths of the conditioned and unconditioned specimens were used for long-term behavior/Performance predictions based on the Arrhenius theory. The test results revealed that the average tensile strength retentions o...
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laboratory characterization and evaluation of Durability Performance of new polyester and vinylester e glass gfrp dowels for jointed concrete pavement
Journal of Composites for Construction, 2013Co-Authors: Mathieu Montaigu, Mathieu Robert, Ehab A Ahmed, Brahim BenmokraneAbstract:AbstractThis paper presents an experimental study that investigated the physical, mechanical, and Durability characteristics of newly developed vinylester- and polyester-based glass-fiber-reinforced polymer (GFRP) dowels through a collaboration research project with the Ministry of Transportation of Quebec (MTQ). Durability Performance was first evaluated with a preliminary set of conditionings in different solutions. The long-term Performance was then assessed under harsh alkaline exposure simulating the concrete environment. The alkaline exposure was achieved by immersing the dowels in an alkaline solution at elevated temperatures to accelerate the effects. Thereafter, the properties were assessed and compared with the unconditioned reference values. The test parameters were (1) type of resin (vinylester and polyester), (2) diameter of GFRP dowels (25.4–44.8 mm), (3) temperature (23, 50, and 60°C), and (4) conditioning time (30, 60, and 180 days). The test results revealed that the vinylester-based GFRP...
