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Journal ArticleDOI

An Experimental Evaluation of Mechanical Properties of Hybrid Reinforcements

01 Jul 2017-Vol. 80, Iss: 1, pp 012019
TL;DR: In this paper, the mechanical properties of unidirectional hybrid reinforcements formed from continuous fibres impregnated with a fiber binding material which are used for reinforcing the concrete are presented.
Abstract: This paper presents the mechanical properties of unidirectional hybrid reinforcements formed from continuous fibres impregnated with a fibre binding material which are used for reinforcing the concrete. Recently FRP (Fibre Reinforced Polymer) manufacturers and suppliers have been increased all over the world because of the superior performance of FRP products in the construction industry. Its non-corrosive nature has turned the attention of many researchers to make several studies on different type of FRP products. Through a vast research, several standards also have been formulated. In this regard a new combination of FRP materials is tried in this paper and its properties have been derived. Carbon fibre and glass fibres fuse in this study to form a new hybrid rebar. The design properties such as tensile strength, tensile modulus, and compressive strength have been studied as per ASTM standards and it has been identified that the Hybrid rebar show a superior performance in comparison with GFRP (Glass FRP) and Steel rebars. This extraordinary performance of hybrid composite material increases the extensive engineering applications such as transport industry, aeronautics, naval, automotive industries.
Citations
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Journal Article
TL;DR: In this paper, the authors present the results of an experimental study of the mechanical properties of FRP reinforcement bars, used as internal reinforcement in concrete structures, at elevated temperatures, and show that the stress-strain relationships of the FRP bars remained almost linear at elevated temperature until failure, at an almost linear rate to zero at about 500 ℃.
Abstract: This paper presents the results of an experimental study of the mechanical properties of FRP reinforcement bars, used as internal reinforcement in concrete structures, at elevated temperatures. Two types of FRP bars namely: carbon fibre reinforced polyester (CFRP) bars of 9.5 mm diameter and glass fibre reinforced polyester (GFRP) bars of 9.5 mm and 12.7 mm diameter were used in the study. For comparison, conventional steel reinforcement bars of 10 mm and 15 mm diameter were also tested. Results from the experimental study show that the stress-strain relationships of FRP bars remained almost linear at elevated temperatures until failure. However, there was a gradual reduction in the failure strength of FRP bars at elevated temperatures, at an almost linear rate to zero at about 500 ℃. Their elastic modulus remained almost unchanged until 300~400 ℃. After this temperature, there was a sharp drop in the elastic modulus. These properties can be used as input in computer programs for modelling the fire behaviour of concrete structural members reinforced with FRP bars.

44 citations

Journal ArticleDOI
01 Dec 2020
TL;DR: In this paper, a comparison between steel rebars and fiberglass-reinforced polymer (GFRP) was conducted, a significant environmental impact was seen in GFRP production process which needs to be considered for production of these materials.
Abstract: The use of fiberglass-reinforced polymer (GFRP) as an alternative solution in strengthened concrete technology significantly has been increased recently. Fiberglass rebar (GFRP) took a stronger position in modern construction. This is due, on the one hand, to its high specific strength (ratio of strength to specific gravity) and on the other hand, too high corrosion resistance, frost resistance, and low thermal conductivity. Its non-corrosive nature has turned the attention of many researchers to make several studies on the different types of GFRP products. Insufficient resources for metal increase the requirement for renewable resources such as composites. However it is considered the environmental issues as a most significant problems which needs to study in every case, from this point of view despite all the GFRP advantages the environmental impacts of this material takes an important place to study, in this study the production stage of GFRP has been studied, in addition to better understand of the issue a comparison between steel rebars and GFRP was conducted, a significant environmental impact was seen in GFRP production process which needs to be considered for production of these materials.

6 citations

References
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01 Jan 2006
TL;DR: The American Concrete Institute (ACI) as mentioned in this paper is a non-profit organization dedicated to the preservation and preservation of concrete artifacts and their use in the construction of concrete structures.
Abstract: Copyright © 2006, American Concrete Institute. All rights reserved including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by electronic or mechanical device, printed, written, or oral, or recording for sound or visual reproduction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.

462 citations

Journal ArticleDOI
TL;DR: In this article, the chemical resistance, void content and tensile properties of EFB/Jute composites were investigated with reference to the relative weight of oil palm EFB and jute, and different layering pattern were investigated.

226 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present the results of an experimental study of the mechanical properties of FRP reinforcement bars, used as internal reinforcement in concrete structures, at elevated temperatures, and show that the stress-strain relationships of the FRP bars remained almost linear at elevated temperature until failure.

186 citations

Journal ArticleDOI
TL;DR: In this article, the thermal stability of glass fiber-reinforced polymer (GFRP) reinforcing bars subjected to extreme temperatures is investigated for applications in North America, especially in Canada.
Abstract: Corrosion of steel reinforced concrete members has stimulated the research on fiber-reinforced polymers (FRP) to be used as an internal reinforcement for concrete structures. The behavior of glass fiber-reinforced polymer (GFRP) reinforcing bars subjected to extreme temperatures is very critical for applications in North America, especially in Canada. There is a high demand for experimental studies to investigate the thermal stability of strength, along with the ultimate elongation, and modulus of GFRP bars. This paper evaluates the variation of mechanical properties of sand-coated GFRP reinforcing bars subjected to low temperatures (ranging from 0 to −100°C ) and elevated temperatures (ranging from 23 to 315°C ). Tensile, shear and flexural properties are investigated to get an overview of the thermal stability of mechanical properties of GFRP bars subjected to large variations of temperatures. Microstructural analyzes using scanning electronic microscopy (SEM), physical measurements by thermogravimetric...

151 citations

Journal ArticleDOI
TL;DR: In this article, carbon nanotubes (CNTs) were grown uniformly on the surface of carbon fibers and glass fibers to create hierarchical fibers by using floating catalyst chemical vapor deposition.

132 citations