scholarly journals State-of-the Art and Practice of Concrete Structures Reinforced with FRP Bars

2012 ◽  
Vol 5 ◽  
pp. 195-200
Author(s):  
Lian Zhen Zhang ◽  
Wei Xiong
Keyword(s):  
State Of The Art ◽  
Concrete Structures ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Flexural Behavior ◽  
Light Weight ◽  
Bond Performance ◽  
The Past ◽  
Reinforced Polymer ◽  
Frp Bars

Fiber reinforced polymer (FRP) bars have been widely used in civil engineering used as a substitute for steel reinforcement because it has many advantage such as high strength, light weight and no corrosion. Moreover, the productive technology becomes more and more mature and industrialized so that FRP has become one economic and competitive structure material. Based on the recent researches, this paper mainly introduces progress in the studies on concrete structures reinforced with FRP bars. These contents in this paper include the bond performance of FRP bars in concrete, shear resistance, flexural behavior and ductility of concrete structure reinforced with FRP bars in the past few years in the world.

scholarly journals FIBER REINFORCED POLYMER AS A REINFORCING MATERIAL FOR CONCRETE STRUCTURES

2021 ◽  
Vol 9 (1) ◽  
pp. 41-48
Author(s):  
Samuel Layang
Keyword(s):  
Concrete Structures ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Light Weight ◽  
Fiber Reinforced ◽  
Structural Failure ◽  
Structural Reinforcement ◽  
Reinforced Polymer ◽  
Physical Chemical ◽  
Reinforcing Material

Concrete is one of the materials that is widely used in various structural works because it has advantages, especially it has high compressive strength and is easy to form. However, concrete can also be damaged by physical, chemical, mechanical and excessive loads. Damaged concrete structures must be repaired and strengthened immediately to prevent further damage that can lead to structural failure. One of the materials that can be used for structural reinforcement is Fiber Reinforced Polymer (FRP). FRP is a composite material made of three basic components, namely fiber, polymer and additives. FRP has advantages such as having high strength, light weight, corrosion resistance, easy installation, requiring little or no scaffolding. FRP is very well used to increase the capacity of structures in buildings that are undergoing changes in function

Utilizing alkali-activated materials as ordinary Portland cement replacement to study the bond performance of fiber-reinforced polymer bars in seawater sea-sand concrete

2022 ◽  
pp. 136943322110651
Author(s):  
Ruiming Cao ◽  
Bai Zhang ◽  
Luming Wang ◽  
Jianming Ding ◽  
Xianhua Chen
Keyword(s):  
Tensile Strength ◽  
Bond Strength ◽  
Ordinary Portland Cement ◽  
Concrete Strength ◽  
Fiber Reinforced Polymer ◽  
Bond Performance ◽  
Reinforced Polymer ◽  
Sea Sand ◽  
Frp Bars ◽  
Alkali Activated

Alkali-activated materials (AAMs) are considered an eco-friendly alternative to ordinary Portland cement (OPC) for mitigating greenhouse-gas emissions and enabling efficient waste recycling. In this paper, an innovative seawater sea-sand concrete (SWSSC), that is, seawater sea-sand alkali-activated concrete (SWSSAAC), was developed using AAMs instead of OPC to explore the application of marine resources and to improve the durability of conventional SWSSC structures. Then, three types of fiber-reinforced polymer (FRP) bars, that is, basalt-FRP, glass-FRP, and carbon-FRP bars, were selected to investigate their bond behavior with SWSSAAC at different alkaline dosages (3%, 4%, and 6% Na2O contents). The experimental results manifested that the utilization of the alkali-activated binders can increase the splitting tensile strength ( ft) of the concrete due to the denser microstructures of AAMs than OPC pastes. This improved characteristic was helpful in enhancing the bond performance of FRP bars, especially the slope of bond-slip curves in the ascending section (i.e., bond stiffness). Approximately three times enhancement in terms of the initial bond rigidity was achieved with SWSSAAC compared to SWSSC at the same concrete strength. Furthermore, compared with the BFRP and GFRP bars, the specimens reinforced with the CFRP bars experienced higher bond strength and bond rigidity due to their relatively high tensile strength and elastic modulus. Additionally, significant improvements in initial bond stiffness and bond strength were also observed as the alkaline contents (i.e., concrete strength) of the SWSSAAC were aggrandized, demonstrating the integration of the FRP bars and SWSSAAC is achievable, which contributes to an innovative channel for the development of SWSSC pavements or structures.

scholarly journals Evaluation of the Bond-to-Concrete Properties of GFRP Rebars in Marine Environments

2018 ◽  
Vol 3 (4) ◽  
pp. 44 ◽  
Author(s):  
Alvaro Ruiz Emparanza ◽  
Francisco De Caso Y Basalo ◽  
Raphael Kampmann ◽  
Itziar Adarraga Usabiaga
Keyword(s):  
Bond Strength ◽  
Concrete Structures ◽  
Steel Reinforcement ◽  
Fiber Reinforced Polymer ◽  
Multiple Time ◽  
Bond Performance ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Different Temperatures ◽  
Corrosion Of Steel

Increased traffic in combination with growing environmental impacts have led to the accelerated degradation of built infrastructure. In reinforced concrete structures, the corrosion of steel reinforcement is the predominant cause of deterioration. Thus, over the last years the use of glass fiber reinforced polymer (GFRP) composites as internal reinforcement bars (rebars) for concrete structures has been evaluated, and has been proved to be a viable alternative to traditional steel reinforcement mainly due to its tensile strength and non-corrosive nature. However, thus far, the GFRP rebar market is diverse and manufacturers around the world produce GFRP rebar types with different surface enhancements to improve the bond to concrete characteristics. In this study, the bond performance of three dissimilar GFRP rebar types (sand coated, helically grooved and with surface lugs) was evaluated over time in seawater environments, with a focus on the bond strength. Accordingly, specimens were exposed to seawater in circulating chambers at three different temperatures (23 °C, 40 °C and 60 °C) for multiple time periods (60 and 120 days). To evaluate the bond performance, pullout tests were conducted according to ASTM D7913. The results showed that the bond strength varied with the surface enhancement features. However, the bond strength did not vary significantly with exposure time and temperature for all three evaluated rebar types.

Surface Interaction Studies on Glass Fiber Reinforced Polymer Bars

2007 ◽  
Vol 345-346 ◽  
pp. 1217-1220
Author(s):  
Jung Yoon Lee
Keyword(s):  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Interfacial Bond ◽  
Glass Fiber Reinforced Polymer ◽  
Bond Failure ◽  
Gfrp Bars ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Frp Bars

The use of fiber reinforced polymer (FRP) bars has been gaining increasing popularity in the civil engineering community due to their favorable properties such as high-strength-to-weight ratio and good corrosion resistance. In order for concrete to be FRP reinforced, there must be interfacial bond between FRP bars and concrete. The interfacial bond behavior of FRP bars to concrete is expected to vary from that of conventional steel bars, since various key parameters that influence bond performance are different. This paper presents the results of an experimental and analytical study on the interfacial surface interaction of glass fiber reinforced polymer (GFRP) bars in high strength concrete cube. The experimental program consisted of testing 54 concrete cubes prepared according to CSA S802-02 standard 1). The split specimens showed that interfacial bond failure of the steel bar occurred due to concrete crushing in front of the bar deformations, while interfacial bond failure of the GFRP bars occurred partly on the surface of the bar and partly in the concrete by peeling of the surface layer of the bar.

scholarly journals Performance Improvement of a Fiber-Reinforced Polymer Bar for a Reinforced Sea Sand and Seawater Concrete Beam in the Serviceability Limit State

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 654 ◽  
Author(s):  
Jiafei Jiang ◽  
Jie Luo ◽  
Jiangtao Yu ◽  
Zhichen Wang
Keyword(s):  
Composite Beam ◽  
Limit State ◽  
Concrete Structures ◽  
Fiber Reinforced Polymer ◽  
Serviceability Limit State ◽  
Reinforced Polymer ◽  
Cracking Control ◽  
Sea Sand ◽  
Optic Fibers ◽  
Frp Bars

Fiber-reinforced polymer (FRP) has supreme resistance to corrosion and can be designed with optic fibers. FRP can be an alternative to steel reinforcement for concrete structures, and can serve as a sensor for smart concrete structures. Due to poor cracking control and bond performance, the limit of flexural capacity in the serviceability limit state has not been determined, which has obstructed the wider application of FRP bars in smart structures. In this study, in order to overcome these shortcomings, a new engineering cementitious composite (ECC) with superior tensile strain capacity was used to replace the cover around the FRP bars in the tensile zone. To investigate the anti-cracking performance of the new composite beam, seven simply supported beams were designed. In the preliminary investigation, the longitudinal FRP bars in these beams were designed without optic fibers to focus on the mechanical behavior. The beams were tested under four-point load and measured using the digital sensor technique, digital image correlation (DIC). The test results showed that introducing a new ECC layer on the tensile side improves the cracking control and flexural behavior (load capacity and deformability) of a FRP-reinforced sea sand and seawater concrete (SSC) beam, especially in the serviceability limit state. We demonstrate the new composite beam can steadily and fully improve the tensile capacity of FRP bars, which is the basis of using FRP bars as sensors.

Flexural Analysis of Simply Supported Concrete Beam Reinforced with FRP Bars

2012 ◽  
Vol 182-183 ◽  
pp. 1617-1621
Author(s):  
Hong Chang Qu ◽  
Ling Ling Chen ◽  
Sheng Li Zhang
Keyword(s):  
Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Flexural Behavior ◽  
Test Results ◽  
Simply Supported ◽  
Reinforced Polymer ◽  
Reinforced Beams ◽  
Theoretical Predictions ◽  
Flexural Analysis ◽  
Frp Bars

The purpose of this paper is to experimentally and theoretically study the flexural behavior of concrete beams reinforced with fiber reinforced polymer (FRP) bars. In this research, two series of concrete beams reinforced with GFRP and CFRP were tested up to failure. Beam stiffness was the same for all beams until the appearance of first cracks. Deflection at failure was identical for beams reinforced with GFRP and CFRP bars, but force at failure of CFRP reinforced beams bars was greater. The theoretical analysis for calculating deflections was carried out. The theoretical results were compared to the test results for the simply supported beam deflections, and the theoretical predictions agree well with the test results.

Study of Crack Width of the Fiber Reinforced Polymer Beam

2011 ◽  
Vol 243-249 ◽  
pp. 806-811 ◽  
Author(s):  
Qin Xu ◽  
Wei Huang ◽  
Hao Zhen Wu ◽  
Jun Yuan Wang ◽  
Jie Yu Liu
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Structural Engineering ◽  
Concrete Structures ◽  
Analytical Formula ◽  
Reinforced Concrete Beam ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Frp Bars

Fiber reinforced polymer (FRP) is a new kind of material for structural engineering in recent year. The partial inferiority of the bond and mechanical properties for FRP bars, however, leads to wider cracks compared with those of steel-reinforced concrete structures. Therefore, current design methods for predicting crack widths developed in concrete structures reinforced with steel bars at service load may not be used for concrete structures reinforced with FRP bars. This paper presents an analytical formula that calculates the maximum crack with in FRP- reinforced concrete beam, taking into account both the bond and the mechanical properties of FRP bars. The experimental results compared well with those proposed by the model.

Anchorage systems for reinforced concrete structures strengthened with fiber-reinforced polymer composites: State-of-the-art review

2020 ◽  
Vol 39 (9-10) ◽  
pp. 327-344
Author(s):  
Qiang Wang ◽  
Hong Zhu ◽  
Bai Zhang ◽  
Yixuan Tong ◽  
Fei Teng ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
State Of The Art ◽  
Concrete Structures ◽  
Fiber Reinforced Polymer ◽  
Reinforced Concrete Structures ◽  
Fiber Reinforced ◽  
Advantages And Disadvantages ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Anchorage System

Fiber-reinforced polymer (FRP) composites have been widely used to strengthen the deteriorated reinforced concrete structures due to their outstanding characteristics of light weight, high strength, as well as noncorrosion. A successful strengthening with the FRP composites would equip the existing structures with the prominent improvement in terms of the durability, ductility, and bearing capacity. Current studies indicate that a simple and reliable anchorage system for the FRP composites will help improve the performance of the strengthened structures both efficiently and economically. Up till now, various anchorage systems have been developed for the FRP composites. Therefore, it is necessary to select appropriate anchorage systems according to different needs and establish relevant design specifications. In view of the aforementioned objectives, this paper systematically summarizes the anchoring mechanism of anchorage systems for two commonly used FRP products (FRP laminates and FRP bars) in different strengthened systems. Additionally, a state-of-the-art review as well as the advantages and disadvantages of each anchorage system are presented. Finally, shortcomings in the current state of knowledge and recommendations beneficial to further study are put forward.

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